| # | Label | Type |
|---|---|---|
| 1 | VSS | gnd |
| 2 | ~CS0 | in |
| 3 | CS1 | in |
| 4 | ~RES | in |
| 5 | RxC | in |
| 6 | XTLI | in |
| 7 | XTLO | out |
| 8 | ~RTS | out |
| 9 | ~CTS | in |
| 10 | TxD | out |
| 11 | ~DTR | out |
| 12 | RxD | in |
| 13 | ~IRQ | out |
| 14 | D0 | io |
| 15 | D1 | io |
| 16 | D2 | io |
| 17 | D3 | io |
| 18 | D4 | io |
| 19 | D5 | io |
| 20 | D6 | io |
| 21 | D7 | io |
| 22 | PHI2 | in |
| 23 | R/~W | in |
| 24 | RS1 | in |
| 25 | RS0 | in |
| 26 | ~DCD | in |
| 27 | ~DSR | in |
| 28 | VCC | vcc |