Difference between revisions of "Atari 7800 Hardware"

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! colspan=4 width="250"|Cartridge Slot Pinout
 
! colspan=4 width="250"|Cartridge Slot Pinout
 
|-
 
|-
−
! Pin # !! Function !! I/O
+
! Pin # !! Function !! Other notes
 
|-
 
|-
−
| 1 || ||  
+
| 1 || Read/Write (Write=LOW) || -
 
|-
 
|-
−
| 2 || ||  
+
| 2 || HALT || -
 
|-
 
|-
−
| 3 || ||  
+
| 3 || D3 || -
 
|-
 
|-
−
| 4 || ||  
+
| 4 || D4 || -
 
|-
 
|-
−
| 5 || ||  
+
| 5 || D5 || -
 
|-
 
|-
−
| 6 || ||  
+
| 6 || D6 || -
 
|-
 
|-
−
| 7 || ||  
+
| 7 || D7 || -
 
|-
 
|-
−
| 8 || ||  
+
| 8 || A12 || -
 
|-
 
|-
−
| 9 || ||  
+
| 9 || A10 || -
 
|-
 
|-
−
| 10 || ||  
+
| 10 || A11 || -
 
|-
 
|-
−
| 11 || ||  
+
| 11 || A9 || -
 
|-
 
|-
−
| 12 || ||  
+
| 12 || A8 || -
 
|-
 
|-
−
| 13 || ||  
+
| 13 || +5 VDC || -
 
|-
 
|-
−
| 14 || ||  
+
| 14 || Ground || -
 
|-
 
|-
−
| 15 || ||  
+
| 15 || A13 || -
 
|-
 
|-
−
| 16 || ||  
+
| 16 || A14 || -
 
|-
 
|-
−
| 17 || ||  
+
| 17 || A15 || -
 
|-
 
|-
−
| 18 || ||  
+
| 18 || External audio to system || -
 
|-
 
|-
−
| 19 || ||  
+
| 19 || A7 || -
 
|-
 
|-
−
| 20 || ||  
+
| 20 || A6 || -
 
|-
 
|-
−
| 21 || ||  
+
| 21 || A5 || -
 
|-
 
|-
−
| 22 || ||  
+
| 22 || A4 || -
 
|-
 
|-
−
| 23 || ||  
+
| 23 || A3 || -
 
|-
 
|-
−
| 24 || ||  
+
| 24 || A2 || -
 
|-
 
|-
−
| 25 || ||  
+
| 25 || A1 || -
 
|-
 
|-
−
| 26 || ||  
+
| 26 || A0 || -
 
|-
 
|-
−
| 27 || ||  
+
| 27 || D0 || -
 
|-
 
|-
−
| 28 || ||  
+
| 28 || D1 || -
 
|-
 
|-
−
| 29 || ||  
+
| 29 || D2 || -
 
|-
 
|-
−
| 30 || ||  
+
| 30 || Ground || -
 
|-
 
|-
−
| 31 || ||  
+
| 31 || IRQ || -
 
|-
 
|-
−
| 32 || ||  
+
| 32 || Phase 2 clock || -
 
|}
 
|}
  

Revision as of 03:33, 25 July 2014

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

Cartridge Slot

Cartridge Slot Pinout
Pin # Function Other notes
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 to system -
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 -

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'.

  • CAO25234 (top)

  • CAO25233-002 REV A (bottom)

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