UNKNOWN CONNECTOR at the Atari. | Pin | Name | | 1 | +5 VDC | | 2 | Audio Out (2 port) | | 3 | Ground | | 4 | R/W Early | | 5 | Enable E0-EF | | 6 | D6 | | 7 | D4 | | 8 | D2 | | 9 | D0 | | 10 | IRQ | | 11 | Ground | | 12 | Serial Data In | | 13 | Serial In Clock | | 14 | Serial Out Clock | | 15 | Serial Data Out | | 16 | Audio In | | 17 | A14 | | 18 | System Clock 01 | | 19 | A11 | | 20 | A7 | | 21 | A6 | | 22 | A5 | | 23 | A4 | | 24 | A3 | | 25 | A2 | | 26 | A1 | | 27 | A0 | | 28 | Ground | | 29 | D1 | | 30 | D3 | | 31 | D5 | | 32 | D7 | | 33 | Not connected | | 34 | Ground | | 35 | Not connected | | 36 | +5 VDC |
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