Atari 7800 Hardware

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This page is used to document details of the hardware for the Atari 7800.

Cartridge slot

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

External links

Processor

The Atari 7800's processor is a variation of the 6502 named Sally.

Motherboard

A peculiarity of 7800 motherboards is that the top and bottom of the boards may have diferent revision labels.

CAO2523x

The top of this board is labeled 'CA025234' and the bottom is labeled 'CA025233-002 REV A'.