Description: DRAM Tester for ZX Spectrum, C64, Oric, Jupiter Ace and other retro computers and equipment. This DRAM tester supports 1 bit DRAM devices from 4Kbit to 1Mbit (eg. MCM4096, M4027P, 4116, TMS4532NL3/4, M3723L/H, 4164, 4128, 41256, MCM511000 etc.).Features of this tester not found in other DRAM testers: Support for 4Kbit parts (e.g. M4027 & MCM4096)Support for 32Kbit parts (e.g. TMS4532 & M3732)Support for piggybacked DRAM such as Samsung KM4128 used in early PCsMulticolour LED output to make the results simpler to read and more intuitive (e.g. working columns show as a horizontal bar, working rows as a vertical bar, fully working as a a square box) As far as I know, this is the only tester available that will test the parts above, but this is essential if you want to keep the replacement parts in your retro computer kit the same as the original. It has a simple power requirement, needing just 5V and drawing less than 100mA, so it can be powered from any USB port with a standard micro-USB cable. The tester generates all of the required voltages (+3V3, +12V, +5V and -5V) from this single supply. How to Use Connect the board to a USB port to provide power Put the DRAM chip in the correct socket: The left socket is for parts that require -5V on pin 1, +12V on pin8, +5V on pin 9 and 0V on pin 16 (e.g. MCM4096, M4027P, 4108 and 4116), all other types should ONLY be tested in the right socket. Press the start button and wait for the result to show on the LEDs. Please note that the LEDs will flicker while the DRAM is being tested, this is normal. Example 16 Pin Parts That Need -5V(pin 1), +12V(pin 8) & +5V(pin 9) (LEFT SOCKET) Mostek MK4027P Motorola MCM4096 Mostek MK4108-x0 TI TMS4108-x0 Mostek MK4108-x1 TI TMS4108-x1 ITT/STC 4116 Mostek MK4116 Example 16 Pin Parts That Use a Single +5V Supply (MIDDLE SOCKET) Please do not put any of these parts in the left-hand socket. Testing any of these in there could damage the part and/or the tester Mostek MK4516 Hitachi HM4816 Intel 2118 TI TMS4532xL3 TI TMS4532xL4 OKI M3732L OKI M3732H Hitachi HM4864 Micron MT4264 TI TMS4164 Samsung KM4128 TI TMS4256 Example 18 Pin Parts That Use a Single +5V Supply (RIGHT SOCKET) Motorola MCM511000Hitachi HM511000Example Results LED OffNo Block LED RedBad Block LED BlueGood 4Kbit Block LED GreenGood 16Kbit Block LED MagentaGood 64Kbit Block LED CyanGood 256Kbit Block Part Size Socket Pass Mostek MK4027P or Motorola MCM4096 4 Kbit Left Mostek MK4108-x0 or TI TMS4108-x0 4 Kbit Left Mostek MK4108-x1 or TI TMS4108-x1 4 Kbit Left ITT/STC 4116 16 Kbit Left Mostek MK4116 16 Kbit Left Mostek MK4516 16 Kbit Middle Hitachi HM4816 16 Kbit Middle Intel 2118 16 Kbit Middle TI TMS4532xL3 32 Kbit Middle TI TMS4532xL4 32 Kbit Middle OKI M3732L 32 Kbit Middle OKI M3732H 32 Kbit Middle Hitachi HM4864 64 Kbit Middle Micron MT4264 64 Kbit Middle 4164 64 Kbit Middle 4128 128 Kbit Middle 4256 or 41256 256 Kbit Middle MCM511000 or HM511000 1024 Kbit Right Test Times The tester is pretty fast, based on a modern 32 bit ARM micro-controller running at 64MHz. Here are some examples of the test times for this tester: Type Size Approximate Test Time 4027/4096 4Kb About 2 seconds 4116 16Kb About 5 seconds 4164 64Kb About 20 seconds 4128 128Kb About 42 seconds 41256 256Kb About 82 seconds 511000 1024Kb About 330 seconds The tests are made such that the refresh period is close to the specified maximum retention time for the part being tested. That means close to 4ms for 64 rows on an M4027 or MCM4096, 2ms for 128 rows on a 4116 part and close to 4ms for the 256 rows on a 4164 or 41256 part. This ensures that any issues that only occur near to the maximum retention time are also detected by this tester. So you can be pretty sure that if a part tests as good in this tester then it should work well in a real application. The Test Procedure1. Measure the size of the DRAM. 2. High speed testsFill the RAM with 0s and check thatFill the RAM with 1s and check thatEven Hash testOdd hash testFill the RAM with random data and check thatRepeat the above random data test several times3. Lower speed tests to test the retention timeFill the RAM with random data and check thatOdd hash testEven Hash testRepeat the above random data test several timesFill the RAM with 1s and check thatFill the RAM with 0s and check thatFor more details, please download the User Manual from here: https://athena.sieraybould.net/eBay/DramTester1Bit/DRAM_Tester_UserGuide_Rev6.pdf If you have access to a 3D printer then I have uploaded a case for this to here: Case For 1 Bit DRAM Tester by SieRaybould - Thingiverse Please note that some of the photos show my earlier tester with two sockets. Apologies for that and I will update them ASAP. The photos are valid though for the left and middle socket on this new version and all previous DRAMs are supported. The only change is the third socket (18 pin) and support for 1Mb parts.
Price: 25 GBP
Location: Walsall
End Time: 2024-07-30T08:58:25.000Z
Shipping Cost: 18.19 GBP
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Item Specifics
Return postage will be paid by: Buyer
Returns Accepted: Returns Accepted
After receiving the item, your buyer should cancel the purchase within: 30 days
Brand: Unbranded
Type: Memory
Manufacturer warranty: 1 year
Country/Region of Manufacture: United Kingdom
Vintage: Yes
