DRAM Tester
Summary
This is a build of the DRAMARDUINO DRAM Tester.
The original project, called DRAMDUINO, was designed as an Arduino Uno shield. In this version, the design was adapted to a perfboard layout
using an Arduino Nano, making the entire build more compact and flexible. The tester supports both 4164 and 41256
dynamic RAM chips, which were commonly used in computers of the 1980s. To use the tester, a DRAM chip is inserted into the ZIF socket and the
reset button on the Arduino is pressed. The test routine begins with the green LED blinking, and after about 80 seconds, the result is displayed:
a solid green light indicates a working DRAM chip, while the red LED illuminates to indicate a defective part. This project is particularly useful
for retro computing enthusiasts and hobbyists who need to verify large batches of old DRAM chips without specialized test equipment.
Diagram
Parts List
| Component | Description | Origin |
|---|---|---|
| 3M™ Textool™ 18 pin ZIF socket | DRAM socket for testing 4164/41256 chips | Vetco Electronics |
| Arduino Nano | Microcontroller responsible for running the DRAM test code | eBay |
| 330 Ohm Resistor (x3) | Current limiting for LEDs and pull-up functionality | eBay |
| Mode Jumper | Selector for 4164 vs. 41256 DRAM compatibility | Unknown |
| Green LED | Indicator showing a working DRAM chip | Amazon |
| Red LED | Indicator showing a faulty DRAM chip | Amazon |
Gallery
Timeline
- 2/27/21
- Project Completed