Atari 7800 Hardware
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This page is used to document details of the hardware for the Atari 7800.
Cartridge Slot[edit]
| Cartridge Slot Pinout | |||
|---|---|---|---|
| Pin # | Function | ||
| 1 | Read/Write (Write=LOW) | ||
| 2 | HALT | ||
| 3 | D3 | ||
| 4 | D4 | ||
| 5 | D5 | ||
| 6 | D6 | ||
| 7 | D7 | ||
| 8 | A12 | ||
| 9 | A10 | ||
| 10 | A11 | ||
| 11 | A9 | ||
| 12 | A8 | ||
| 13 | +5 VDC | ||
| 14 | Ground | ||
| 15 | A13 | ||
| 16 | A14 | ||
| 17 | A15 | ||
| 18 | External audio from cart | ||
| 19 | A7 | ||
| 20 | A6 | ||
| 21 | A5 | ||
| 22 | A4 | ||
| 23 | A3 | ||
| 24 | A2 | ||
| 25 | A1 | ||
| 26 | A0 | ||
| 27 | D0 | ||
| 28 | D1 | ||
| 29 | D2 | ||
| 30 | Ground | ||
| 31 | IRQ | ||
| 32 | Phase 2 clock | ||
Sources:
- http://atarihq.com/danb/7800cart/a7800cart.shtml
- http://www.atarimax.com/jindroush.atari.org/7800cart.html
Processor[edit]
The Atari 7800's processor is a variation of the 6502 named Sally.
Motherboard[edit]
A peculiarity of 7800 motherboards is that the top and bottom of the boards may have diferent revision labels.
CAO2523x[edit]
The top of this board is labeled 'CA025234' and the bottom is labeled 'CA025233-002 REV A'.
CAO25234 (top)
CAO25233-002 REV A (bottom)
