Tester for 2114 SRAM chips using an Arduino Nano. The code can be loaded into the standard Arduino IDE for uploading/editing.
2114 SRAM chips are used in the ZX81, they are 4096 bit chips arranged in 1024 rows of 4 bits. This code uses a Arduino Nano to perform various tests on a 2114 chip to check that it is working.
The prototype wiring (v01) is outlined in the table below
| Port | Arduino | 2114 |
|---|---|---|
| PC0 | A0 | IO1 |
| PC1 | A1 | IO2 |
| PC2 | A2 | IO3 |
| PC3 | A3 | IO4 |
| PC4 | A4 | Green LED |
| PC5 | A5 | Red LED |
| PC6 | A6 | Switch |
| PD0 | 0 | Serial (Debug) - leave empty for USB |
| PD1 | 1 | Serial (Debug) - leave empty for USB |
| PD2 | 2 | /CS (Chip Select) |
| PD3 | 3 | /WE (Write Enabled) |
| PD4 | 4 | A0 |
| PD5 | 5 | A1 |
| PD6 | 6 | A2 |
| PD7 | 7 | A3 |
| PB0 | 8 | A4 |
| PB1 | 9 | A5 |
| PB2 | 10 | A6 |
| PB3 | 11 | A7 |
| PB4 | 12 | A8 |
| PB5 | 13 | A9 |
The project is currently is currently at the prototype stage but I am working on a PCB design which should hopefully be available soon.
