50 PIN MALE EDGE the computer.
| Pin | Name | Dir | Description |
|---|---|---|---|
| 1 | +5v | OUT | Power, 300mA |
| 2 | /CNTRL2 | IN | Game adapter control signal |
| 3 | +12v | OUT | Power, 100mA |
| 4 | -12v | OUT | Power, 50mA |
| 5 | /CNTRL1 | IN | Game adapter control signal |
| 6 | /WAIT | IN | Z80 WAIT |
| 7 | /RST | IN | Z80 RST |
| 8 | CPU CLK | OUT | Buffered 3.58MHz system clock |
| 9 | A15 | OUT | Buffered Address bus |
| 10 | A14 | OUT | " |
| 11 | A13 | OUT | " |
| 12 | A12 | OUT | " |
| 13 | A11 | OUT | " |
| 14 | A10 | OUT | " |
| 15 | A9 | OUT | " |
| 16 | A8 | OUT | " |
| 17 | A7 | OUT | " |
| 18 | A6 | OUT | " |
| 19 | A5 | OUT | " |
| 20 | A4 | OUT | " |
| 21 | A3 | OUT | " |
| 22 | A2 | OUT | " |
| 23 | A1 | OUT | " |
| 24 | A0 | OUT | " |
| 25 | /RFSH | OUT | RAM expansion refresh |
| 26 | /EXCSR | IN | Video-CPU write select |
| 27 | /M1 | OUT | Z80 M1 |
| 28 | /EXCSW | IN | CPU-Video write select |
| 29 | /WR | OUT | Z80 WR |
| 30 | /MREQ | OUT | Z80 MREQ |
| 31 | /IORQ | OUT | Z80 IORQ |
| 32 | /RD | OUT | Z80 RD |
| 33 | D0 | I/O | Buffered Data Bus |
| 34 | D1 | I/O | " |
| 35 | D2 | I/O | " |
| 36 | D3 | I/O | " |
| 37 | D4 | I/O | " |
| 38 | D5 | I/O | " |
| 39 | D6 | I/O | " |
| 40 | D7 | I/O | " |
| 41 | CSOUND | IN | Audio input signal |
| 42 | /INT | IN | Z80 INT |
| 43 | /RAMDIS | IN | Disable user RAM |
| 44 | /ROMDIS | IN | Disable basic ROM |
| 45 | /BK32 | OUT | Enable bank 32 Memory (8000-ffff) |
| 46 | /BK31 | OUT | Enable bank 31 Memory (0000-7FFF) |
| 47 | /BK22 | OUT | Enable bank 22 Memory (8000-FFFF) |
| 48 | /BK21 | OUT | Enable bank 21 Memory (0000-7FFF) |
| 49 | GND | - | System Ground |
| 50 | GND | - | System Ground |