Atari 2600 Cartridge

                         Top
 D3   D4   D5   D6   D7   A12  A10  A11  A9   A8  +5V   SGND
--1- --2- --3- --4- --5- --6- --7- --8- --9- -10- -11- -12-
 GND  D2   D1   D0   A0   A1   A2   A3   A4   A5   A6   A7
                        Bottom

UNKNOWN (at the Atari)

UNKNOWN CONNECTOR at the Atari.

Connect a 2716 or 2732/2532 EPROM.

Top Row

Pin	2716 Pin	CPU Name	Description
1	13	D3	Data 3
2	14	D4	Data 4
3	15	D5	Data 5
4	16	D6	Data 6
5	17	D7	Data 7
6	*	A12	Address 12
7	19	A10	Address 10
8	n/c	A11	Address 11
9	22	A9	Address 9
10	23	A8	Address 8
11	24	+5V	+5 VDC
12	12	SGND	Shield Ground

* to inverter and back to 18 for chip select

Bottom Row

Pin	2716 Pin	CPU Name	Description
1	1	A7	Address 7
2	2	A6	Address 6
3	3	A5	Address 5
4	4	A4	Address 4
5	5	A3	Address 3
6	6	A2	Address 2
7	7	A1	Address 1
8	8	A0	Address 0
9	9	D0	Data 0
10	10	D1	Data 1
11	11	D2	Data 2
12	n/c	GND	Ground

Contributor:

Joakim Ögren

Source:

Classic Atari 2600/5200/7800 Game Systems FAQ