Atari 7800 cart connector specifications


1   R/W	  	 32  CLK2
2   Halt         31  IRQ
----------------------------
3   D3	         30  GND
4   D4           29  D2
5   D5           28  D1
6   D6           27  D0
7   D7		 26  A0
8   A12          25  A1
9   A10          24  A2
10  A11          23  A3
11  A9           22  A4
12  A8           21  A5
13  +5V          20  A6
14  GND          19  A7
-----------------------------
15  A13          18  EAudio
16  A14          17  A15


Pins 3-14 and 19-30 are identical to the Atari 2600 and allow the 7800 to utilize existing 2600 cartridges. The remaining pins are 7800 specific pins.

R/W - Read/Write signal from the processor, 0 = Write/1 = Read
Halt - Input to the processor. This pin halts the processor and tri-states the address and                             data busses.
D0..D7 - Data Bus
A0..A15  - Address Bus
+5V - +5VDC power to the cartridge
GND - Signal ground
CLK2 - Phase 2 clock from the processor
IRQ - interrupt request to the processor
EAudio - extern audio input to the system. Allows the cart to contain extended audio hardware.