2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 1 3 5 7 9 11 13 15 17 19 21 24 25 27 29 30 PIN ??? CONNECTOR at the computer. | Pin | Name | Description | | 1 | GND | Ground | | 2 | GND | Ground | | 3 | VCC | +5 VDC | | 4 | VCC | +5 VDC | | 5 | SD1 | Data Bus 1 | | 6 | SD0 | Data Bus 0 | | 7 | SD3 | Data Bus 3 | | 8 | SD2 | Data Bus 2 | | 9 | SD5 | Data Bus 5 | | 10 | SD4 | Data Bus 4 | | 11 | SD7 | Data Bus 7 | | 12 | SD6 | Data Bus 6 | | 13 | /SDREQ | DMA Request | | 14 | /INTX | Interrupt Request | | 15 | /CSS | Chip Select | | 16 | /SDACK | DMA Acknowledge | | 17 | /IOR | I/O Read | | 18 | /IOW | I/O Write | | 19 | A8 | Address Bus 8 | | 20 | 7M | 7.16 MHz System Clock | | 21 | A6 | Address Bus 6 | | 22 | A7 | Address Bus 7 | | 23 | A4 | Address Bus 4 | | 24 | A5 | Address Bus 5 | | 25 | A2 | Address Bus 2 | | 26 | A3 | Address Bus 3 | | 27 | /IFRST | +5 VDC | | 28 | A1 | Address Bus 1 | | 29 | GND | Ground | | 30 | GND | Ground |
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