Apple II - 50 pin female
bus connector
Expansion Slot Connector for the Apple II Series Interface/Add On Cards.
| Pin | Name | Direction | Description |
|---|---|---|---|
| 1 | GND | - | |
| 2 | DMA IN | IN | |
| 3 | INT IN | IN | |
| 4 | /NMI | - | |
| 5 | /IRQ | - | |
| 6 | /RES | - | |
| 7 | /INH | - | |
| 8 | -12V | - | |
| 9 | -5V | - | |
| 10 | NC | - | |
| 11 | 7M | - | |
| 12 | Q3 | - | |
| 13 | CLK1 | - | Clock 1 |
| 14 | USER 1 | - | |
| 15 | CLK0 | OUT | Clock 0 |
| 16 | /DEVSEL | OUT | low means port is active |
| 17 | D7 | IN/OUT | Data Lines |
| 18 | D6 | IN/OUT | |
| 19 | D5 | IN/OUT | |
| 20 | D4 | IN/OUT | |
| 21 | D3 | IN/OUT | |
| 22 | D2 | IN/OUT | |
| 23 | D1 | IN/OUT | |
| 24 | D0 | IN/OUT | |
| 25 | +12V | OUT | |
| 26 | +5V | OUT | |
| 27 | DMA OUT | OUT | |
| 28 | INT OUT | OUT | |
| 29 | /DMA | - | |
| 30 | RDY | - | |
| 31 | /STROBE | - | |
| 32 | NC | - | |
| 33 | R/W | OUT | high:Reading Data+Add. low:Writing Data+Add. |
| 34 | A15 | IN/OUT | Address Lines |
| 35 | A14 | IN/OUT | |
| 36 | A13 | IN/OUT | |
| 37 | A12 | IN/OUT | |
| 38 | A11 | IN/OUT | |
| 39 | A10 | IN/OUT | |
| 40 | A9 | IN/OUT | |
| 41 | A8 | IN/OUT | |
| 42 | A7 | IN/OUT | |
| 43 | A6 | IN/OUT | |
| 44 | A5 | IN/OUT | |
| 45 | A4 | IN/OUT | |
| 46 | A3 | IN/OUT | |
| 47 | A2 | IN/OUT | |
| 48 | A1 | IN/OUT | |
| 49 | A0 | IN/OUT | |
| 50 | I/O SEL | - |