Please download the User Guide attached in the "Safety and accessibility information" section of this listing.

This DRAM tester supports the following 18 and 20 pin 4 bit DRAM devices:

16K x 4 (e.g. TMS4416)
64K x 4 (e.g. TMS4464, NEC µPD41464)
256K x 4 (e.g. TMS44256, NEC µPD424256, etc.)
1024K x 4 (e.g. TC514400)

How to Use

Connect the board to a USB port to provide power. The LED should light white.
Put the DRAM chip in the socket with the notch at the top and pin1 the top left.
(for 18 pin parts, the bottom two socket holes should be empty)
Press the start button and wait for the result to show on the LED.
Please note that the LED will flash white/yellow while the DRAM is being tested, this is normal.

DRAM Tester for ZX Spectrum, Amiga and other retro computers and equipment.

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.

How to Use

Connect the board to a USB port to provide power

Put the DRAM chip in the socket with pin 1 top left.

Press the start button and wait for the result to show on the LED.

Please note that the LED will flash White/Yellow while the DRAM is being tested, this is normal.

Results

Red
Failed Test

Blue
Good 4416

Green
Good 4464

Magenta
Good 44256

Cyan
Good 514400

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

4416

16Kbitx4

About 6seconds

4464

64Kbitx4

About 24 seconds

44256

256Kbitx4

About 90 seconds

514400

1Mbitx4

About 360 seconds

The tests are made such that the refresh period is close to the specified maximum retention time for the part being tested.
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 Procedure
1. Measure the size of the DRAM.
2. High speed tests
Fill the RAM with 0s and check that
Fill the RAM with 1s and check that
Even hash test
Odd hash test
Fill the RAM with random data and check that
Repeat the above random data test several times
3. Lower speed tests to test the retention time
Fill the RAM with random data and check that
Repeat the above random data test several times
Odd hash test
Even hash test
Fill the RAM with 1s and check that
Fill the RAM with 0s and check that
Please note that you can also buy my 1 bit and 4 bit testers as a pack at a discount and also save on the postage here:
https://www.ebay.co.uk/itm/126634604850

Red	Failed Test
Blue	Good 4416
Green	Good 4464
Magenta	Good 44256
Cyan	Good 514400

Type	Size	Approximate Test Time
4416	16Kbitx4	About 6seconds
4464	64Kbitx4	About 24 seconds
44256	256Kbitx4	About 90 seconds
514400	1Mbitx4	About 360 seconds

4 Bit Dynamic RAM (DRAM) Tester for 4416, 4464, 44256, 424400, 514400, etc.

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