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4164 ram chip 12, ·15 65 536-BIT (65 536-WORD BY I-BIT) DYNAMIC RAM ABSOLUTE MAXIMUM RATINGS Symbol Paramater Conditions Limits VCC Supply vohage -1-7 V, I nput voltage With respect to Vss -1-7 Va Output voltage -1-7 10 Output current 50 Pd Power dissipation Ta =25·C 700 Topr Operatmg free-air temperature range 0-70 Tstg Storage An emulation of the 4164 64k x 1 bit dynamic RAM. According to the Apple Memory Guide January 2001, all desktop Macs numerically before the 4400 (Tanzania) used only FPM RAM, in 30-pin (or 72-pin) SIMMs, as tomlee59 observed. After each test, it blinks GREEN as many times as the Then remove the eight ram-chip U26 thru U33 (MT4264). It also sports an AST SixPack Plus An 8-bit computer wanting 64K of RAM, could most straightforwardly use eight 64kx1 DRAM chips (64kbit, 1 data line). Memory chips used in IIe (except maybe later versions) are common A CPU sets out a memory request, and the memory delivers. 50 . Or, it will DAMAGE the chip for the wrong voltage settings!!! Missile Command - 4164 RAM upgrade Purists look away. On the ones I checked, I got 4. Those are pin compatible, but you have to make sure that pin 1 is grounded. Organization. Adaptors (0) 4164 Dynamic RAM DRAM Chip 64Kx1 Bit 16 Pin DIP IC. & Power Transistors. 4116 chips for the lower 16k of RAM and 4164 or 4532 DRAM for the 32K of Upper RAM. Note: my supplier has raised their prices so unfort I have to raise mine as well. reReddit: Top posts of January 23, 2019. OK SO WHY DO YOU WANT THESE?. This will save you repeating the whole procedure in case the chip breaks again. The 41464 has 4 data bits and 64k addressable locations. To modify them for 16k ram replacement you need to follow these instructions: Some quick troubleshooting and replacement of a bad tri-voltage 4116 ram with single voltage 4164 ram. General Electronics Chat Replacement for MK4164 ram chip? Thread 2MB static RAM, organized as 128k words x 16, or 32k x 16 x 16. Later editions of the Apple IIc, Commodore 64, Commodore 128, and COCO2 switched ToTs RETRO Commodore 64/128/Plus 4 and C16 Ram Replacement Each order comes with 8 Tested and Working 8k Ram Chips w/Sockets Guaranteed . The 4164 is a high-speed Dynamic Random Access Memory (DRAM) in a 16−Lead DIP type package organized as 65,536 words of one bit each. Simply move the jumper accordingly. It's a 64k chip which has either a bad lower side or bad upper side, as indicated by L or H designation. There are many variants of the mainboard so double check that the it is the right design. Pln-outs conform to the JEDEC approved pin out. For example, the 4116 RAM chip stores 16,384 bits, in a cell (bit) matrix that has 128 rows and 128 columns. Sega Saturn FRAM IC - 256kbit battery-free built in The two banks of 64 KB use RAM chips of type 4164, of an access time rating of 200 ns (or faster), and of the type where pin 1 is not used (Not Connected). Add to Wishlist ; 4164 DIP DRAM chips Learn More. (U28) The coolest part about this tester has to be the OLED screen. We I am not able to salvage chips as I only have. A picture-oriented diagnostic guide for Commodore 64 computers. The upgrade kit was supplied with 4164 RAM chips, full 64Kx1. The two RAM chips, bottom right are U5 and U6, and the two For the first few years after its release in 1982, the Commodore 64 used eight RAM chips of 64kbit each. 3xC64 | 1541 | 1541-II | DIY 1581 | Pi1541 ♥ | MacBook running Vice C64 emulator. g. This gives you a very nice read out of the testing progress. Grid view List view. I used to put all suspect RAM chips into a bowl. Here’s a summary of the options and some links and pictures: 1. 74: About 70 types of 74-family and 40-family chips. com addresses are The motherboard has 256-KB of RAM on it with some 9-chips of TI 4164-20 soldered to the motherboard in bank 0. They are RAM chips, which were produced in the GDR (German Democratic Republic) in the mid 80s. THE ANSWER IS AVAILABILITY, RELIABILITY, AND PRICE. Most of the lines between the RAM chips are parallel except for a couple, so you can use a multimeter to find which chip(s) have the 4164 Class RAM Chip - 128cycle/2ms Type - Additional Information The text block below is from the Internet. Add to Cart. More than 4 307 195 components listed : KM4164 series datasheets. 8 x 4164 RAM chips from Retroleum; Some 16-pin DIL chip sockets for the RAM from Amazon; It’s worth pointing out that the 4164 RAM chips are not a like-for-like replacement for the original RAM chips. DRAMBOARD V1. That meant the minimum configuration was 4K (cheap) but it board, using 4164, plugged into the MMU connectors to bring a 256 KiB setup up to 512 KiB without pulling the existign chips - after all, at 4164 (TMS4164-15NL) (64K x 1) 150nS DRAM - Texas. ROMs - Conversion boards available for modern EEPROMs. PCB Rebuild Kits. As a state-of-the-art MOS memory device, the 4116 (16K advanced circuit techniques are designed to provide wide operating margins, both internally and to the system in speed and power previously seen only in MOSTEK’s high-performance MK Vintage DRAM chips 4116, 4164, 41256, 44256 RAM chips This is for one chip. However, in Thai it is called the As the Evening Draws in the Night Sellers Appear. 4116 & 4164 DRAM Tester / Stephen Vickers HYB4116 HYB4164. It could be the MMU but that is unlikely. This chip requires a +12V, +5V and a -5V line, as well as GND. Showing all 7 results. RAM Chips (8) Switches (2) Show All Arcade. (Like AM9016DPC). Home computers of the era may not have used the capability (which would have required a DRAM controller capable of recognizing when the next access was going to be within the same row as the last, require Does an actual datasheet exist for the 4164 RAM chips? I found some information, but it's just lines representing the chips. The design is optimiz· ed for high speed, high performance applications such as computer memory, buffer memory, peripheral storage and environments where low power C128: 4 x 41464 (64kbit x 4) / 16 x 4164 (64kbit x 1) Replacing two chips is not that much of a work, but with 8 or 16 chips you want to know which one(s) are broken. The chips should be 150ns or faster (the type number should be followed by -15 or a lower number, so 4164-15, 4164-12 etc. THIS WAS BAD NEWS AND GENERATED TOO MUCH HEAT ON THE CHIP. you have to replace the second bank with 8x 41256 chips and add some other glue logic chip plus some wires. Fake chips (or chips that will fail) are very much a risk, so it is important to source them from someone who has run them through a RAM tester. The 4164 was used for upper RAM, and they were the ones that were binned for working upper and lower, and you set a jumper to select the good half to use. Alternatively, if all the 4116 DRAM chips are removed and all of them are replaced with 4164 chips, then instead of bending the chip pins, cut the relevant PCB tracks between the power section and the DRAM chip area. It provided storage for computers such as the Apple II, TRS-80, ZX Spectrum, Commodore PET, IBM PC, and Xerox Alto as well as video games such as Defender and Missile Command. It is organized as 65,536 one-bit words and fabricated using HMOS high-performance N-channel silicon-gate technology. Packaging. comI specifically needed to test HM4864P RAM chips to 4116 runs off of +12, +5, and -5 volts. lowen Veteran RAM Chips; 4164 Dynamic RAM DRAM Chip 64Kx1 Bit 16 Pin DIP IC; Description; Reviews (0) Used in many arcade boards, pinball machines and older computer systems. Williams 4164/41256 Ram Adapter converts the Per a YouTube video on reviving a C64, I checked pin 8 of several of the memory chips (they are not in sockets). Test your vintage computer RAM chips such as 4164, 4116, 41256, etc. Products (2) Datasheets; Images; Newest Products; Memory Size. No multiplexed data expected on its data OK SO WHY DO YOU WANT THESE?. It's the 5160-086 model with a 256KB motherboard fully populated with RAM. This is achieved by using 8x 4116 16K by 1-bit DRAM chips. Then rewire on the bottom of the board. The DRAMBOARD is an Arduino Nano based 4164/41256 DRAM memory chip tester. 4164 RAM Chip for Breadbin C64 (excluding p/n: 250466 boards) Also used in the Amstrad CPC464 etc. 4 mm FR-4, 1. These are perfect for replacing defective 4116 chips. What did it use up to the end of that time? A couple of months ago I resuscitated a 1985 IBM PC/XT that had been 28yrs in storage (by rewinding the primary coil of the PSU T5 transformer and replacing a handful of 4164 RAM chips). But the machine was manufactured until Commodore went bankrupt in 1994. nl Replacement for MK4164 ram chip? Home. I bough 10PCS 4164 KM4164B KM4164B-10 KM4164B-12 KM4164B-15 DIP16 KM4164 64K X 1BIT DYNAMIC RAM WITH PAGE MODE New original 100% quality. ZX Spectrum 16K to 48K memory upgrade kit € 4164 RAM Chip for Breadbin C64 (excluding p/n: 250466 boards) Also used in the Amstrad CPC464 etc. The 4164 series of DRAM chips were launched in the late 70s with speed grades available down to 120ns. Williams CPU 4116. This adapter is a very small PCB board that can be used to allow you to insert a 4164 RAM into a 4116 socket. 1 - 2 for 4164 and 2 - 3 for 41256. Data Bus Width. By multiplexing row- and column-address inputs, the MCM4164CP requires only eight address lines and permits packaging in standard Schematics are identical to what you find on the arduino playground except there is an additional LED. It is this mix of voltages that makes the chips prone to destroy themselves if they fall out of the tolerance ranges Usually the RAM chips have numbers like 4116 on them. These RAM chips produce more heat than chips that only use +5v, and problems with the power switch can cause the 4116 DRAMs to fail to operate properly. 5V; V(in/out): -2 to +7V; 1W; 50mA; 64K x 1-bit dynamic RAM with page mode in 20-pin SOP package. The Dead Test cart is saying one of the memory chips are possibly bad. Just plug in a new chip and it's done. First of all, I want to congratulate you on the 4116 memory tester you designed. They have the part number U2164D C15. RAM chips with the brand MT are crap and often fail. I took all 8 RAM chips out, drenched them in contact cleaner, same with sockets, let it all dry and reassembled in different order. These are a 64K RAM chip where both banks work but the Spectrum, of course, will only use one half of the RAM depending upon the links set. Add to cart. These are the 256K ram-chips. New-made versions of the 8701 clock chip, originals are prone to failure. Looking to get some ram for my 128 and wondered if the 4164 chips are the same as the M3764's that are already onboard? Top. Home; Help; Search; Login; Register; News: Support this site Shop Amazon Arcade Stuff through our link. , cut off at chip and at board) pins 1, 8, and 16. MITSUBISHI LSls M5K4164ANP. Darren Harris Staten Island, New York. ) Fitting the upgrade should be as simple as plugging the chips in the right way round. Voltage Reg. The LEDs will alternate RED/GREEN while a test is running. Insert DRAM chip in socket (3), check chip orientation 4. Anyway, machine doesn't work with those bad. My first IBM PC had a whopping 256K of RAM, made up of 4 banks of 4164 chips! I eventually replaced them with 41256 chips for a whopping 640K (the other 384K wasn’t usable by the version of DOS - Install a socket and solder it. Package: 16 pin DIL; As used in all but the last "breabin" C64 board (PCB p/n boards have 2 x 41464s instead of 8 x 4164s) Unused, clean, old stock parts (all chips tested for 2 hours before dispatch) Lots of other 4164 chips should work. Arduino Forums. On a 68k Without a booting machine however, how can I test that the RAM is working OK? Thankfully, a circuit for testing 4164 ICs can be used, as long as you can supply the required 12v and -5v power lines that the 4116 ICs require. Tested using the Stephen Vickers Dram Tester. Supply Voltage - Max. Many people (myself included) choose to replace a failed 4116 RAM chip with a modern replacement “board” that uses SRAM instead of DRAM. Mixed access times from 100ns to 150ns. It has four banks. Description: 64K X 1 BIT DYNAMIC RAM WITH PAGE MODE. I broke one of the capacitors while removing the old memory so ordered hundreds of those to replace 1. YOU MUST USE ALL 4164 RAM OR REMOVE CONVERSION / ADAPTOR TO GO BACK TO 4116 RAM. L. The chips on the board say "Mtu 4264-15 USA". KM4164 series- 64K X 1 BIT DYNAMIC RAM WITH PAGE MODE from Samsung Electronic datasheet. This website; Contact us via e-mail; The U72 chip for the Model 4/4D NGA memory upgrade has finished testing in my stock 128K board for more than 48 hours and has passed successfully. There are quite a few reports of folks having 1-1-1 OR 1-3-1 RAM issues after the swap. 4164 (TMS4164-15NL) (64K x 1) 150nS DRAM - Texas. 6 8 Reviews ౹ 36 sold. You can test both 4164 and You cannot mix TMS4532-20NL3 and TMS4532-20NL4 chips. Select 4164 or 41256 test mode with jumper (1) 2. These RAM chips produce more heat than chips that only use +5v, and problems with the power switch can cause the 4116 DRAMs to fail to operate Despite that the TL866 only support static ram for testing, to test those DRAMs a test algorithm should be implemented in firmware. An Arduino project is used to explain the workin Note: Where 4×32 chips are installed, they must be all of the same type, however you can replace them with 4164 RAM chips (though these must have a 128-cycle refresh, verify with their datasheet) in any number – the jumper settings are irrelevant to the 4164 chips but some valid link setting should still be made. Post by starhawk » Fri Apr RAM chips. Attachments. These were apparently quite widely used ICs - the 41xx is 1-bit memory, and the 44xx is 4-bit memory, with the xx64 having 64k addresses and the xx256 having 256k The 4116 and 4164 chips are nearly identical with two exceptions so if you cut off pin 1, and bend out pin 8, trim and jumper to pin 9 you have a 4116 replacement that uses less I've got some spare 4164s so I got brave and tried the piggybacking technique to see if I could identify the offending chip. The 4164 is a basic DRAM chip that was used in a wide variety of home computers in the 1980's: the Apple IIe, IIc, and 128k Macintosh; the Atari 800XL; the Commodore 64 and 128; and the Radio Shack Color Computer 2. I’ve put two large heatsinks on chips and installed a dual OS ROM with a switch. 2 posts • Page 1 of 1. Here's a good list of lots of manufacturers' 4164 chips and their properties: so I started by just pulling the current chips and replacing them with some RAM chips that I 4164 Spectrum "Upper RAM" Chip. Minimum Operating Temperature. Will it be possible to adapt your 4116 tester to this 93422PC – SRAM 256×4 – 45 ns? as I see your chip has different implementation then the 4116. B. Broken case during shipment among other things. I supply the PAL if needed. Original 4416 RAM chips were replaced by 41464s. I'll upgrade it using 41256 RAM chips in place of Banks and Chips Suppose a 64–byte memory that is to be implemented using chips that are 16 bytes: a 64 x 8 memory from 16 x 8 memory chips. Once you change the voltages around - whether by hacking the board or using a power pin converter - you can put 4516 (5v only 16K chips), 4164, or 41256 chips on the board. If the tester discovers that a chip is bad it will even display where it found the problem. Its been a while since I purchased any RAM ICs. Maximum Operating Temperature. 4164 Class RAM Chip - 128cycle/2ms Type - Additional Information The text block below is from the Internet. In this video I'm assembling a 4116 / 4164 DRAM tester. On each the 4116 chips on the board, snip and remove (entirely, i. Our Tindie Guarantee protects your purchase from fraud. They are of type 4164 and have an access time of 150 ns, refresh cycles of 128cyle/2ns. 2 x 78. van. Computers. Buy TMS4164-15NL 64K DRAM by Texas Instruments. It's not uncommon to see a bad RAM chip in a C64. Each bank contains one chip. The data buffers need to be enabled for the 8000-FFFF space in the same way as for method 1 (above). I've got a couple of 4164's here from when I upgraded my TRS-80 CoCoII to 64K (swapped them for 4464's) Hello everyone, just got a c64 in terrible shape. Package: 16 pin DIL; As used in all but the last "breabin" C64 board (PCB p/n boards have 2 x 41464s instead of 8 x 4164s) Unused, clean, old stock parts (all chips tested for 2 hours before dispatch) 4164 Spectrum "Upper RAM" Chip. $30. 2 – 4164/41256 DRAM chip tester Test memory chips for the C64 (breadbin) quick and easy! 8x 4164 DRAM (8x8kB) are used in older C64:s. Wishlist On Wishlist Tweet Share Pin Previous Next. 4264-8 = 80 ns. Package / Case. The Model B+ uses eight 4164-type DRAM chips to provide 64K of RAM. You should chose the CORRECT model via SW1 switch BEFORE you put the chip into the ZIFF socket. 00. DRAM LPDDR4 16G 1GX16 FBGA MT53E1G16D1FW-046 AAT:A TR; The 4116-to-4164 RAM adapter is a replacement solution to replace a 4116 RAM with a 4164 RAM. Aaaaaand ready 😀. 64Kb x 1-Bit DRAM: TMS4164-15 - 4164 RAM DIP DIP16 Texas Instruments. This adapter is a very small PCB board that can be used to allow you to insert a 4164 - Install a socket and solder it. A14 and A15 need to be multiplexed through the spare gate of Z24, and applied to the extra address pin of the 4164 chips. I think it is not the same as the 4164-15. Modern ICs draw less power and importantly drop the Despite that the TL866 only support static ram for testing, to test those DRAMs a test algorithm should be implemented in firmware. Background: RAM chip addressing The dynamic RAM chips used in the IBM 5150 do not store bytes; they store bits. Organisation: 65536 x 1 Access time: 150nS Package: 16-pin PDIP Status: NOS (New Old Stock) Individually tested com I have an 800XL that fails the ram test. These are 32Kb chips that are pin compatible with the 64Kb 4164 type, so as pointed out by lvd in the comments to Tommy's answer a 4164 can be directly substituted. 4164 is 4 times as big, and you end up wasting all that extra capacity, but 4164 is a) more readily available and b) only uses one volt rail rather than 3, so it runs cooler. I wouldn't bother doing the mod unless I was trying to fix a 64 with a dead ram chip and I only had a 41464 on hand. In the 128k "toastrack" and grey "+2" it used good versions of the 4164 for all its memory. For sale is an Arduino based DRAM tester for 4164 and 41256 memory chips. A couple of ways to figure out which bit is failing: Some notes on RAM repair, which may or may not be useful: The RAM in the upper memory of the issue 3/4 spectrum is usually a TMS4532-20NLx chip. If you're worried about the sockets on your 800XL: buy another socket, remove one of the RAM chips, insert that into one of the sockets, then 1 by 1 test the IC's in that socket. Search title or content Search. Similar Description - D41464: Manufacturer: Part # Datasheet: Description: NEC: UPD41256: 722Kb / 17P: 262144 X 1-BIT DYNAMIC NMOS RAM UPD41416: 296Kb / 6P: 16,384 X 4-BIT DYNAMIC NMOS RAM UPD41257: 736Kb / 16P: 262144 X 1-BIT DYNAMIC NMOS RAM List of Unclassifed Man M41256XX: 1Mb / 22P: Dynamic Most of the other chips have a different number on them. New old stock 8x 4164 RAM chips € 19. New posts Latest sales threads Search forums. This subreddit is discussion and tech support of Apple II hardware, software, and emulators. Once it hits around 4pm, you'll see sellers start Seri 47 Residence (Serithai - Bueng Kum) is a luxurious apartment situated at Seri Thai road, Carefree of traffic jams. The good news, still posts to Apple II prompt 4164 DRAM. The newer 4164 chips are drop in replacements with the exception of a 0 MEMORY ARRAY () w a 262,144 MEMORY CELLS '§: 0 II: c8~SUNG -vee -vss GENERAL DESCRIPTION The KM41464A is a fully decoded 65,536 x 4 NMOS Dynamic Random Access Memory. Untested with 4116 chips, only tested with my MSX’s main RAM. B. These are for: 1. Storage capacity and organization 64K Bit Dynamic RAM The MCM4164CP is a 65,536-bit, high-speed, low-power dynamic Random-Access Memory. Organization: 64K x 1, Speed: 150ns or faster, 128-cycle refresh, Package: 16 pin DIL Can be used individually or in any quantity to replace any of the original Upper RAM chips used in the Spectrum 48K (eg: Texas Instrumenents TMS4532-15NL3, TMS4532-15NL4, OKI M3732H-20, M3732L-20). If you don't see them then you're using 16k RAM. Like Reply. Some of these are NOS and some are reclaimed and 100% tested. Headed to get some dinner, and then stop at the local Simple project to test the dram of C64/C16,Spectrum and other 8bit computers (4164,4116,4532). This same technique will be how the other 41256-class RAM chips acheive a 256-cycle refresh. The bits are in the form of a matrix, a certain number of rows and a certain number of columns. You could also do more at a time of course, but 8 x 4164 Upper Memory dram chips. Only the very earliest II+ had memory select blocks. The Commodore 64 initially did this, but in the mid-80s, the cost-reduced redesign *1 - Prior chip companies were happy if they could supply as many 4164 as requested, so no need to waste wafer runs on less demanded more First I had to put sockets under two RAM chips and two 74ls257 logic chips. CB Accessories (15) CB Radios (6) Satellite (1) Show All Communications. You can test both 4164 and 41256 DRAM. In this article we’ll hunt for more broken RAM chips by comparing the output from a known good 4164 RAM chip with the output of each installed 4164 RAM chip. C64 RAM - 4464 instead of 4164. starhawk Joe Blade Posts: 277 Joined: Wed Feb 11, 2009 7:26 pm Age: 38. This is a 4–way interleaved memory. starhawk Joe Blade Posts: 277 Joined: Wed Feb 11, 2009 7:26 pm A set of 8 new 4164 RAM chips; 1x 74LS00 logic chip; 1x 74LS32 logic chip; 2x 74LS 157 logic chips; 2 small wires; An assembly manual; This kit assumes that the motherboard of your ZX Spectrum 16K has: 8 unpopulated IC sockets for the memory upgrade; 4 unpopulated IC sockets for the required logic chips; Only small wires need to be soldered. Why I created this kit as I work on a lot of early 80s arcade games (such as Atari Missile Command, Williams Robotron, Joust, Defender Arduino program to test 4164 DRAM chips Designed to run with a SparkFun RedBoard Qwiic but should work with any ATMEGA328 based board. Ian. The next step is usually checking socketed chips, power, ribbon cables etc. The C64 makes a great 4164 RAM tester, as the machine doesn't work at all with any of them bad since each chip is 1 bit of 8 total. Top. What's new. Missile Command originally uses 8 x 4116 rams, and 4116 rams are terrible. PCBWay Commodore 16 RAM expansion 64Kb solderless on TED The +12v and -5v rails need to be disconnected from the RAM chips since the 4164's only need +5v and GND. Please make sure its Today 32 Dual In-line Pin (DIP) memory chips of type 4164 (64K by 1 bit) were delivered. The Model 4/4D/4P uses 4164 chips. I wish to increase the RAM to 640-KB and apparently the IBM service manual accommodates the increase of size relative to SW2. Newer versions of the color RAM available (U19). The chip has 18 pins in the picture, even Can anyone recommend a suitable replacement for the old MK4164 (64kx1 D-ram) chip? This is for an echo effect project I found in Electronics World, December 1986, p44. Latest sales threads New posts New blog entries Latest activity New blog entry comments. Reddit . Backside situates the Seri Thai Park, the park in Bangkok with the Huai Khwang is one of the 50 districts of Bangkok, Thailand, located east of the city center and is famous for the Huai Khwang Night Market that starts at 07:00 PM and there is a mod to give 320kb ram - google it. An interesting feature of the Apple II was that it had three rows of sockets for RAM chips, each of which could take either 4k or 16k chips. The live tester successfully verifies that a TMS4164-15 DRAM chip under test in my stand-alone 4164 RAM tester is outputting the correct values. The external device must respect the video chip accesses which are indicated by a signal line. atferrari. The 4164 is a basic DRAM chip that was used in a wide variety of home computers in the 1980's: the Apple IIe, IIc, and 128k Macintosh; the MarkusNaslund wrote: 4164 RAM Chips all the same and is this one okay? The model number of that chip is fine (KM4164B) for breadbin (longboard) RAM, but the picture is confusing. KM4164B-10: 100ns; V(cc): -1to +7. Quick View. INSTRUCTIONS 1. ZX Spectrum 16K / 48K ‘upper memory’ (there are 8 There's even an evil hack where you replace the 4116 RAM with 4164, by bending up the legs. > insted of 4164 chips ?? Someon know how?? It is also possible to replace the 4164 with the 41256. used on William game boards to replace the 4116 RAM with modification. The motherboard is populated with 18 x 41256 (-15) and 18 x 4164 (-12) chips. (32k of general RAM, 20K of shadow screen RAM, and 12K of sideways RAM. The use of EDO RAM (1k or 2k refresh rate) coincided with use of the 603e processor. With the exception of simple (static) RAM this will happen in various timing. 00; Qty Add to Cart. It is therefore possible to replace the RAM memory chips with any present in this list: 4164-2, It should be just 4164 ram. 65,536 x 1 RAM,16-pln package • Sillcon-gate, Double Poly remove all upper RAM chips (4532) cut -5V, +5V and 12V voltages to VRAM chips; connect +5V to pin 8 of VRAM chips; solder DIL sockets to all VRAM and upper RAM chip positions; put 4164 DRAM chips to all sockets; turn on The replacement of the memory chip had positive effects, in fact the Commodore 64 started with the usual boot screen. 7/2015 The System 80 comes with 16K of RAM as standard when manufactured. For operation you need a 9V power supply with (+) in the center! Before you test anything, please check the correct polarity on the 9V connector and the correct voltages on the two sockets. itself but this looks awful and not practical for some collectors to replace them where as anyone can drop in a stock chip. (There is no reason why it shouldn’t work with a 4116 chip. JPG. To handle this, the memory subsystem communicates with the CPU request. These are the same chips I used to fix my Flat Commodore 128, That had bad memory. for 48K ZX Spectrums and Oric-1 We try to send the same manufacturer of the chip where possible but sometimes we cannot depending on stock. More posts you may like Top Posts Reddit . 4164 DRAM was used in several popular home computers throughout the 1970s and 1980s, including the Apple ][ series, Commodore Namco Custom Chips; Building a Vector Monitor from a Raster TV; Star Wars – Repair Log; Bomb Jack: Fix logs and other information -5V and +12V) with 4164 memory (64k memory needing only +5V), but there are multiple ways of doing it. It seems like the 5 volt RAMs are 'sensitive' for lack of a better term and tend to reveal issues you may not have seen with the 12 volts RAMs. 3. View Details. You will be discounted for purchasing multiple. Upgrades of up to 48K are traditionally possible by either installing an expansion unit, or by piggybacking additional 4116 IC’s on top of the original 8 IC’s and then The 4 power pins are a quirky curiosity of the lower RAM in the Spectrum that is not shared by the 4164 / TM4532 / MSM3732 DRAM chips used in the “upper” RAM. This was for the C64 memory bank you were trying to work on? Top. They also have 4164 ram chips if you're looking for spares. 4164 examples. Connect Arduino micro USB connector (2) to powered (5V) USB port with attached cable 3. I but them and have 33-50%failure rate. reReddit: Top posts 64K Memory Upgrade using 4164 DRAM M. Sure enough, when the 4164 is piggybacked over one One common upgrade is to replace the 4116 memory (64k memory needing +5V, -5V and +12V) with 4164 memory (64k memory needing only +5V), but there are multiple ways of doing it. Organization: 64K x 1, Speed: 150ns or faster. 7 KB · Views: 38 4164 Ram Adaptors. Do I just replace every chip with 4164 chips? Thanks. What is it The 4116-to-4164 RAM adapter is a replacement solution to replace a 4116 RAM with a 4164 RAM. Modify the CPU board to re-route the +5V Set of 8 new old stock 4164 RAM chips for ZX Spectrum 16K / 48K / 128K / +2. Be careful with Chinese chips-they are often fake. Thank you! Forum notices to gmail. For sidecars I'm interested in 4164s and 41256s. A. Does anybody have a good source for 4164 DRAM chips? I have a few PCjrs that I want to start debugging and fixing. So this may be one of many (rabbit hole scenario) but it is flashing consistently the same number of flashes. An Arduino is required. Brand and exact model may differ. Basically, you can use a faster chip (lower "ns"), but you should not use a slower chip. This is a simple tester for 4164 and 4864 DRAM chips, it uses an Arduino Pro Mini, I2C OLED, and a small number of common components. When that bowl got to 40 Here, we explore the distinctive features and specifications that set the 4164 DRAM apart from other memory chips. Product Details. this may free up some spare chips for your other XE - unless they Looking at the schematics for an "8 RAM chip" C64 (later ones used two 64Kx4bit chips instead; FWIW, that doesn't simplify the problem at all) one approach you could take if you really wanted to go hog wild cutting up and destroying your computer is you could remove the two 74LS257 multiplexers at U13 and U25 and run the address lines A0-A15 The 4164 has 1 data bit and 64k addressable locations. The first is just the chip itself and the second is a kit of the chip and eight 64K x 1 RAM of an appropriate type to work correctly. Background: I'm looking at upgrading the RAM in my TRS-80 Clone from type 4116 to 4164. In this video I assembler a DRAM tester DIY kit designed to test the 4116 and 4164 DRAM chips commonly used in 8-bit micro computers. merkerk(at)dse. SWITCHING DIODE CHIPS More results. If you have all the RAM sockets filled then it's almost guaranteed that you have 48k on a II+. New old stock 8x 4116 RAM chips € 24. The reasons are clear, modern boards are made using readily available components - even “new” 4116 chips are all old stock and 30-odd years old. Sold By TrilobytESRetro. You must remove the +12 and -5 volts from the sockets and put the +5 volts on the right pins for powering up the 4164 chips. Depending upon your I bought a soldering iron, some sockets, a bunch of Tesla 4164 memory chips (ebay) and got to work doing a horrible rookie job of removing just the 8 on the right side and putting in sockets. A simple and very effective upgrade to any classic Williams game. Use 220 ohm resistors for each. It could store (or read) a single bit at a time and computers would use eight in parallel to store bytes Be sure that you don't install slower chips than what your machine has in it already. The kit adds some logic which forms a latch, so that the extra line on the mux chip is switched from high to low under software control, and indicates which bank is active with an LED which would shine out of the expansion port. So far as I know the chips used in the Apple IIe/c and Mac 128k are completely bog-standard 4164s so you shouldn't really need a cross-reference table; IE, searching for "4164 DRAM" should net you a compatible 64kbitx1 part, the only thing that should matter beyond that is the speed rating. 95. The item is on my website (link in signature) in two choices. Demultiplexing the address pins would be the easy part; the whole concept of the timing is different, in that the /RAS and /WE lines are edge-triggered with respect to address and data inputs, whereas SRAMS normally expect Back in the late 1970s, the most popular memory chip was Mostek's MK4116, holding a whopping (for the time) 16 kilobits. For some background while I wasn't having major RAM issues, the Joust boards as well as Defender, Robotron, and maybe a few others, use a chip called a 4116 which can get pretty hot and prone to failure. It is also know as the black market of Bangkok. KM4164 Datasheet. Memory chips used in IIe (except maybe later versions) are common 4164 DRAMs (different manufacturers may use slightly different names, but they're all the same), easily obtainable on the web. Part #: KM4164B. Connectors, Headers & Pins. KM4164B-15 / TMS4164-15NL 64K x 1 Bit NMOS Dynamic NOS RAM. Next, install Z2 thru Z9 in the place of U23 thru U33. The Apple II makes a good 4116 tester- just use the first or second chip, they are zero-page and stack (or maybe each bank is wired 1/8 like the C64, I forget). --Peter van Merkerk peter. For motherboard repairs I need 4164s. Step two: Prep the 4164 chips. In stock. Motherboard says REV-D. Add to wishlist. All Compact AIOs therefore use 30-pin FPM SIMMs, at blazing speeds from 150ns to 100ns. Most of the timing arguments are also moot since I swapped the RAM using the usual adapter. I don't know if such algorithm can be implemented as bit banging on the client side (as for logic chips for example) because of the dynamic nature of these memories and if you don't refresh the data very quick (2 or 4 ms if i This RAM debugging technique resulted in the correct identification of a bad 4164 chip. Performed two different tests on them. It does boot to a normal screen expect that the ram available only shows about 31k, instead of the close to 39k that should be available. You can, however, replace TMS4532-20NL3 and 20NL4 chips with 4164 chips. Instant onscreen price and availability check. An emulation of the 4164 64k x 1 bit dynamic RAM. One found 3 bad and the other test added two more to the broken ones. Or, it will DAMAGE the chip for the wrong voltage settings!!!. VAPS. 250ns was not faster than RAM in 1983. It provided storage for computers such as the Apple II, TRS-80, ZX Spectrum, The coolest part about this tester has to be the OLED screen. 640KB. The 4164 is a single power DRAM Chip. Each bank of NINE chips must be be same BRAND and SPEED. 77 volts. Cross reference: 4116 (pin compatible – requires pin 1 to pin 16 voltage mod) 2116 (pin compatible?) KM4146 (pin 1 NC) M3764; MSM3764; HM4864; MCM6665; 2118 1024×8 Static RAM. I need to source some RAM chips of the 4816AP-3 variety and Forums. r. To digress a tad, China Town is the place for second-hand goods and antiques. These are perfect for replacing defective 4164 chips or upgrading a ZX Spectrum 16K*. What RAM do I buy? Exact replacement from China like this? Can I buy a C64 kit like this Or do I buy RAM like this and ge The C64 makes a great 4164 RAM tester, as the machine doesn't work at all with any of them bad since each chip is 1 bit of 8 total. No multiplexed data expected on its data Back in the late 1970s, the most popular memory chip was Mostek's MK4116, holding a whopping (for the time) 16 kilobits. December 18, 2024, 01:03:11 am. Japanese chips are the best. Purpose of this modification: The 4116 DRAMs used by the TMS9928A video chip require -5v, +5v, and +12v . Joined Jan 6, 2004 4,864. Custom Chips/Daughter PCBs. )The eight chips are arranged in one single bank, with each chip providing one bit for all 4164 DIP DRAM chips Learn More. Never test a 4164 RAM in a 4116 socket because it is likely to be fried. I've seen plenty of projects for testing DRAM used in old 8 bit computers, mostly 4114 and 4164 found in the ZX Spectrum and Commodore 64. Purchase the memory chips and sockets listed in this HOWTO as a kit. Datasheet: 653Kb/11P. Indeed the very first desktop computer, E. Manufacturer: Samsung Electronic. 100. The good news, still posts to Apple II prompt This is, of course, very slow but there was a time in the 1960s when sequential access memory chips where cheaper and more readily available than RAM chips. Disk programs don't load correctly and cartridge games don't For an original PC1512, you need 18 4164 RAM chips. 08. It's designed by Stephen Vickers, and (at time of writing) is available for purchase from his eBay st Purchase the memory chips and sockets listed in this HOWTO as a kit. FEATURES . (GREEN on pin 12 and RED on pin 7). WARNING: This tester DOESN'T TEST memory on RAM. Photos are just examples. 65 As low as: $1. Description; TMS4164-15NL 64K DRAM by Texas Instruments. . Set of 8 new old stock 4116 chips for the ZX Spectrum 16K/48K. I build my 1 bit DRAM Tester so I can test 4164 and 4864 DRAM chips, the PCB's were sponsored by PCBway. I could be wrong on the 80 ns, but my memory says that is how it looked. Store / Arcade / Videogames / Parts/Kits. Power circuits, pre-modification. all of these 64k chips should work in the 8-chip XL/XEs µPD4164,HM4864, HM4864A, HYB4164, LH2164, M5K416, MK4564, MB8264, MB8264A, MSM3764, MN4164, MT4264, TMM4164, TMM4164A, TMS4164 4164 That hard will take 4164 (pointless) 4128 (Piggbacked 4164 drams, rare and pointless) and 41256 (What you want). Features 8x Tested and Working 4164-10 or 4164-12 or 4164-15 Ram Chips for 64k 8x 16 Pin DIP Sock Today 32 Dual In-line Pin (DIP) memory chips of type 4164 (64K by 1 bit) were delivered. My first IBM PC had a whopping 256K of RAM, made up of 4 banks of 4164 chips! I eventually replaced them with 41256 chips for a whopping 640K (the other 384K wasn’t usable by the version of DOS this adapter board will convert a 4164 to 4116 for use in machines that require 4116 no other modifications are necessary to the machine or the ram chip there are 8 in this pack. 4264-15 = 150 ns. Board Games; Communications. all of these 64k chips should work in the 8-chip XL/XEs µPD4164,HM4864, HM4864A, HYB4164, LH2164, M5K416, MK4564, MB8264, MB8264A, MSM3764, MN4164, MT4264, TMM4164, TMM4164A, TMS4164 4164 The old Spectrum used two types of RAM. Joined Jul 10 Instructions: Insert chip to be tested into the ZIF socket, select 4164 or 41256 via toggle switch, power up the Arduino (either through the USB port or optional power port for standalone operation) and press the "START" button. Quantity * + — Only 10 left in stock, order now! Buy with confidence. And this is how some 4164s (8-bit address) will be able to acheive a 128-cycle refresh. Basically, we place the known good 4164 RAM chip on a breadboard next to the computer to test, and then connect all address, RAS, CAS, WRITE and D pins to the equivalent pins on one of The 4116 was used for lower RAM in 48k version, or all the RAM if you had a 16k version. Cross Reference: 2116 (ground A10 pin) 8416 – 16384×8 CMOS Static RAM. the 4164 stored 64k bits of memory. M5K4164ANP-15 Dynamic RAM (DRAM) by Mitsubishi. This is a circuit which allows to test various ICs used in old computers. Ask a Question !. They have the part number U2164D Set of 8 new old stock 4116 chips for the ZX Spectrum 16K/48K. Home computers of the era may not have used the capability (which would have required a DRAM controller capable of recognizing when the next access was going to be within the same row as the last, require The number one resource on Reddit for Apple ][, Apple II, or even Apple 2 however you spell it. The narrative in the video is not very coherent, but this is what I di Chips, Caps, Pots - Misc. Forums. Check out the chips placement here. Here you can see it is pretty much the same, other than the address lines are A0-A7 and A8-A15 and the RAM chips are 4x64K instead of 4x16K. ZX Spectrum 16K / 48K ‘lower memory’ (there are 8 of these chips in these ZX Spectrum models) TMS4164-15NL 64K DRAM by Texas Instruments. A 4164 takes approximately 80 seconds to test, a 41256 will take longer. If you require a specific model or speed grade, inquire to see what stock I have. ZX Spectrum 16K / 48K ‘lower memory’ (there are 8 of these chips in these ZX Spectrum models) NB: Not suitable as ‘upper memory’ for ZX 16K/48K: these are 4164 chips, available in the webshop. You can accomplish the same thing by not using This video covers the working of a 4164 DRAM chip used in 8-bit computers like Atari 800XL and Commodore 64. 4 Results. Check your computers catalog number, if its 26-1069A or 26-1070, then you don't need the U72 PAL. Please make sure its Looking carefully at the 4164 datasheet, there are some use-cases described that would be fairly complex to replicate around an SRAM chip. Package: 16 pin DIL; As used in all but the last "breabin" C64 board (PCB p/n boards have 2 x 41464s instead of 8 x 4164s) Unused, clean, old stock parts (all chips tested for 2 hours before dispatch) Newer 4164 RAM only needs one of the three voltages (4116 needs all three) and runs considerably cooler. Making a Williams 4116 to 4164 RAM Adapter. 8 x 4164 Upper Memory dram chips. I had to solder a few wires from chips to a switch. The 48K Spectrum was fitted with 32K RAM chips which were in effect 64K RAM chips with a marked fault on one bank of 32K. Had 2 c64s, as I gave one to my good friend, anyway it is looking up for the chips I bought as I was looking at schematics (why I didn’t do this earlier idk) for both the chips on my c64 (MN4164p-15)and the ones I bought (MT4264-15) and they seem to have the same pinout, thought some are different names but serve functionally Catalog Datasheet MFG & Type PDF Document Tags; Z86C1200ZEM. jpg. You can use two 4464 chips, this does require a fair amount of extra wiring though. For example replace a 150ns chip with Now that the TRS-80 Model 4 has fancy graphics, let's put the cherry on top and upgrade it to 128K of RAM. 128K upgrade, if your computer is an early non-gate array M4 then you need a U72 PAL chip in addition to the 8 4164 ram chips. Maximum Clock Frequency. Bank 0: 256 KB sized, addressed 00000 to 0FFFF hex Hi all, not sure this is in the right area but here goes. Riptor Well-known member . All the 'adapter' does is cut those extra voltage lines so they don't get to the chips, and moves the other voltages around. These are still generally available although you need to be careful of the source. Search for: Search. These chips are commonly used in retro computers and arcade machines from the 80's The PCB features short circuit protection in the form of a resettable fuse and also has 100 ohm resistors in series with each address/data line to protect against damaged chips under test (Shorts to GND or Vcc) Speaking of RAM chips: Will this RAM chip work on American models, or are they made only for European models? So grab whatever 4164 ram chips you have access too, don't over pay on sketchy sites! Reply reply Top 5% Rank by size . I might be possible, depending on the board revision, to install 1Mbit DRAM, but they are 250ns was not faster than RAM in 1983. The RAM model, MB8264A-15, is nearly identical to the classic 4164 model, offering a 150-nanosecond access speed. They are the row closest to the TV RF module. New old That used two 4464 RAM chips rather than eight 4164 as the earlier versions and the plus/4. 774 views. Clean and very slightly tin the shoulders of the remaining pins on the 4116 chips sot that it will be easier to achieve a good connection when you piggy back the other chips on. As of this writing the k Re. Starting from Thanon worachak, we entered the biggest second hand market in Bangkok. 200 ns is the figure that appears in IBM's technical reference for the 5160. However, this initial testing only confirms basic functionality and does not evaluate the chips’ performance under real-world operating conditions. I need to test 10 Chips 93422PC memories – SRAM 256×4 – 45 ns. An Arduino project is used to explain the workin Arduino program to test 4164 DRAM chips Designed to run with a SparkFun RedBoard Qwiic but should work with any ATMEGA328 based board. You can solder them to the mother board, or use sockets. 2 KB · Views: 42 Last edited: Jul 4, 2011. This video covers the working of a 4164 DRAM chip used in 8-bit computers like Atari 800XL and Commodore 64. Note that (64 8) / (16 8) = 4. In the late eighties, it became cheaper to use a pair of 256kbit chips of the 4-bit-wide variety. I believe I am looking for 4164 DRAM chips such as Samsung KM4164B 4164 – 64K x 1 DRAM. The memory is constructed from 4164 DRAM chips of varying speeds the slowest of which are 200ns parts hence the requirement. Current status. 2 Layers PCB 62. Also designed to run with a SSD1306 based 128x64 OLED display connnected over I2C via the Qwiic header. Next, I soldered all SD2IEC wires and installed them inside a case. To address a particular bit: 1. This adapter is a very small PCB board that can be used to allow you to insert a 4164 Test your vintage computer RAM chips such as 4164, 4116, 41256, etc. If you should have them then they'll be on the left side of your RAM and marked 4 or 16. this adapter board will convert a 4164 to 4116 for use in machines that require 4116 no other modifications are necessary to the machine or the ram chip there are 8 in this pack. II. The 41464 has 3 additional pins for the 3 additional data lines so that is the main change in rewriting. The ZX Spectrum additionally uses the 4532 which is an odd chip. $1. long and run a jumper from pin one on each of the 256K ram-chips The 4116 is a new generation MOS dynamic random access memory circuit organized as 16,384 words by, 1 bit. Vintage DRAM chips may be new-old-stock or used. The pinout of the 4116s: i would say ebay are ok - i've had 4164 ram form ebay and it worked fine unless seller says "not working" you will be refunded if faulty. The 4164 RAM chips did not go as successfully, because I'm an idiot. cade Jumpman Posts: 4106 Joined: Sat Aug 28, 2004 5:36 pm Location: Augusta, Georgia, USA Age: 53. This is a design by Stephen Vickers, and (at time of writing) The current design will only work with the Dragon 32 Mk2 Issue 6 mainboard with 16 4116 chips. From its storage capacity and access speed to its voltage requirements and refresh operations, this section sheds light on the essential aspects that define the capabilities of the 4164 DRAM. e. IC support list: DRAM: 4116 (not tested), 4164, 41256, 4416, 4464, 44256, 21010, single-voltage 4116 (K565RU5 or sth like it). Refresh period is extended to 4 Here, we explore the distinctive features and specifications that set the 4164 DRAM apart from other memory chips. RAM chips look good but only 5 out of 10 are working. This is normal. Now take a piece of wire approx 12 in. Banks 1-3 has IBM 2164-20’s in sockets on the motherboard. I don't know if such algorithm can be implemented as bit banging on the client side (as for logic chips for example) because of the dynamic nature of these memories and if you don't refresh the data very quick (2 or 4 ms if i 10PCS 4164 KM4164B KM4164B-10 KM4164B-12 KM4164B-15 DIP16 KM4164 64K X 1BIT DYNAMIC RAM WITH PAGE MODE New original 100% quality. Sometimes, a device maker The HYB 4164 is a 65,536-words by 1-bit (64KB), MOS random access memory circuit fabricated with 5-Volt only N-Channel silicon gate technology, using double layer The MCM4164CP is a 65,536-bit, high-speed, low-power dynamic Random-Access Memory. Because the width of the memory chip is the same as that of the RAM chips still need all of those things internally regardless, and on most chips (4116, 4164, etc) they either do have pins for that (the W(rite) pin is the same thing as a "direction" pin), or derive them from other signals anyway (CAS effectively functions as both CS and OE if appropriate). The 4164 tester instructions I followed are here. Reading that suggests that Z80 based systems that rely only on the Z80's R register (restricted to 128 rows) to control the addressing of the row to be refreshed, will require 4164s of the 128cycle/2ms type. To see how the chip is implemented I opened one up and 4164 Spectrum "Upper RAM" Chip. Abstract: Z86E61 Z86E63 Text: Z86E61/E63 CPS DC-4164-03 Z86E61 AND Z86E63 CMOS Z8 OTP MICROCONTROLLER GENERAL DESCRIPTION The Z86E61 is a member of the Z8 ® single-chip microcontroller family with 16 Kbytes of EPROM and 236 bytes of general-purpose RAM and the Z86E63 has 32K This little tester can be used with 4164 and 41256 DRAM memory chips. May 8, 2010 #25 SgtWookie said: In this kit I build a 4116 / 4164 DRAM testing kit, suitable for ZX Spectrums Lower and Upper RAM tests, Commodore 64 plus many more retro computers. U9-U12 (4164 RAM) - PASS (SO FAR) U21-U24 (4164 RAM) - PASS (SO FAR) BT2 - PENDING CR4 - PENDING VR1 - PENDING I'm done for the night. They don't just die (a lot) they often take out other parts when they die. The refresh period is extended to 4 milliseconds, and during this period each of the 256 rows must be strobed with RAS in order to retain The NTE4164 is a high speed Dynamic Random Access Memory (DRAM) in a 16−Lead DIP type package organized as 65,536 words of one bit each. Models produced for export to Germany and the USA use a different board layout, and the ICs are numbered differently. The main Model 4/4P requirement that not all chips will meet is that they must require only 128 refresh addresses (rather than 256). Reason is that many of the programs I try In this video I'll be testing the 4116 / 4164 DRAM tester that I assembled in a previous video. The green LED will blink thoughout the test. An interesting tidbit is that the upper RAM chips on the Spectrum are actually 64K, however only one half passed the manufacturing tests meaning only 32K is usable, and this significantly lowered the cost. 4610 memory, buffer memory, peripheral storage and environments where low power dissipation and compact lay out are required. It should be just 4164 ram. Similarly, you cannot mix MSM3732-L and MSM3732-H chips. For DRAM Tester for 64k x 1 4164 and 4864 RAM. 58. Multiplexed row and column address inputs permit the MB8264 to be hous ed In a standard 16-pln DIP. Model B+. place custom text here. These are static ram chips that can be used with arcade games and computers that have 16 or 64k ram. (pictures of the modified board kindly supplied by Claire). For example: 4264-10 = 100 ns. Any speed faster than 150ns works. Format 64K (6556-word x 1-Bit) Speed: Access time 150nS 260nS cycle time Package: 16-pin DIP Download Mitsubishi Vintage DRAM chips 4116, 4164, 41256, 44256 RAM chips This is for one chip. For the revised version, you need four 41464 chips and two 4164s. The behavior of the “wrong bits” are because the broken RAM-chip either keep a data line high or low when it shouldn’t. From its storage capacity and access speed to its voltage requirements Apart from major differences (such as access time), there can be differences (some subtle) that result in a particular 4164 chip not being suitable for your purpose. DIP-16 Package. The board is not socketed so I would like to by RAM and sockets. Manufacturer: Samsung semiconductor. About. The 16-bit address bus and 8-bit data bus are available to connect to. Micron Technology RAM chips ("MT" letters printed on the chip) are known to fail more often than the other types used in C64s. Here is the relevant area on the Commodore 16 board. I have run into an ambiguity regarding some 4164 RAM. RAM - There are SRAM conversion boards (SaRuMan-128, and others) available for about $20 USD to replace all the 4164 RAM chips which can be somewhat pricey today. The tester certainly does! You just need to re-wire slightly. The team begins with a tester to ensure the chips pass preliminary checks. 0 reviews / Write a review. So in the end it looks like I need some RAM. Item #: WILRPA $ 8. PCBWay Community. That meant the minimum configuration was 4K (cheap) but it board, using 4164, plugged into the MMU connectors to bring a 256 KiB setup up to 512 KiB without pulling the existign chips - after all, at i would say ebay are ok - i've had 4164 ram form ebay and it worked fine unless seller says "not working" you will be refunded if faulty. Hardware Design. 4164 DRAM is used in Commodore 64 and other old comput-ers. There are people who sell based on how much they have on hand, and you can Hello my friends Looking to refurb an Acorn BBC Micro Model B for our resident Wizard. Part 4164 Ram chips qty 8. I was looking for actual full datasheets. Product Code: 4164; Availability: In-Stock; $2. 26. To confirm it is correct there should a row of 9 chips across the top right of the board (IC1-IC8 and IC43), a further row of 7 chips should be underneath it (IC36-IC42). 6 mm, 1, HASL with lead, Green Solder Mask, White silkscreen. with Parity oddly (bad pun). boqyfj vzxqtl cnxyn psuy akmjv kqhws qxonnn gdv zrc gau