2114 SRAM 1K x 4 pinout
DIP-18. Static RAM (ZX80 and ZX81 1K)
1K x 4 static RAM in 18 pins on +5 V alone. Two make 1 KB, eight bits wide. Static, so no refresh. A bad 2114 gives garbage on the screen or a crash as the program grows.
Open the interactive 2114 pinoutPins
| Pin | Name | Type | Signal |
|---|---|---|---|
| 1 | A6 | addr | Address bit 6. |
| 2 | A5 | addr | Address bit 5. |
| 3 | A4 | addr | Address bit 4. |
| 4 | A3 | addr | Address bit 3. |
| 5 | A0 | addr | Address bit 0. |
| 6 | A1 | addr | Address bit 1. |
| 7 | A2 | addr | Address bit 2. |
| 8 | /CS | ctrl | Chip select, active LOW, from the address decoder. |
| 9 | GND | ground | 0 V (Vss). |
| 10 | /WE | ctrl | Write enable. LOW writes the data pins. |
| 11 | D4 | data | Data in/out 4 (DQ4). |
| 12 | D3 | data | Data in/out 3 (DQ3). |
| 13 | D2 | data | Data in/out 2 (DQ2). |
| 14 | D1 | data | Data in/out 1 (DQ1). |
| 15 | A9 | addr | Address bit 9. |
| 16 | A8 | addr | Address bit 8. |
| 17 | A7 | addr | Address bit 7. |
| 18 | VCC | power | +5 V supply. |
Fitted in
- ZX80 IC3, IC4
- ZX81 IC4a, IC4b (some boards fit one 1K x 8 4118 at IC4 instead)
- PET / CBM
- VIC-20 UD2, UE1, UE2, UD3-UE6
- Commodore 64
- Commodore 1541 disk drive UA2, UA3, UB2, UB3 (long board only)
- ColecoVision U3, U4
- TRS-80 Model III U81, U82 (video RAM)
