The AMD 8155(H) and 8156(H) are RAM and I/O chips designed for use in the 8085AH MPU system. The device includes a 2K-bit static RAM organized as 256 x 8, with maximum access times of 400ns or 330ns depending on the speed option. It features three general-purpose I/O ports (two 8-bit and one 6-bit) and a 14-bit programmable counter/timer.
| RAM Size | 2K bit (256 x 8) |
|---|---|
| Power Supply | Single +5 V |
| I/O Ports | Two 8-bit and one 6-bit |
| Timer | 14-bit binary counter/timer |
| Max Access Time (Standard) | 400ns |
The maximum access time is 400ns, permitting use with no wait states in 8085AH CPU.
It contains two 8-bit I/O ports and one 6-bit I/O port.
The 10/M pin selects the memory section if LOW and selects the I/O section if HIGH.