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 |
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