There where a very small number of cartridges released for the 7800, but despite this there is quite a wide variation in the hardware used in them. This page documents the various types of hardware I have found in 7800 carts. Special thanks to Mitchell Orman for loaning me some carts I didn't have documented, and to Eckhard Stolberg for his excellent bankswitching guide.

7800 Cartridge Hardware Variations - This document describes the various type of 7800 cart hardware I have found.

7800 Bank Switching Guide - This document by Eckhard Stolberg describes the various bankswitching modes in 7800 carts.

 

1	Read/Write from 6502, low = Write	32	Phase 2 clock from 6502
2	Halt to 6502	31	IRQ to 6502
3	D3 to/from 6502	30	Ground
4	D4 to/from 6502	29	D2 from 6502
5	D5 to/from 6502	28	D1 from 6502
6	D6 to/from 6502	27	D0 from 6502
7	D7 to/from 6502	26	A0 from 6502
8	A12 from 6502	25	A1 from 6502
9	A10 from 6502	24	A2 from 6502
10	A11 from 6502	23	A3 from 6502
11	A9 from 6502	22	A4 from 6502
12	A8 from 6502	21	A5 from 6502
13	+5 VDC	20	A6 from 6502
14	Ground	19	A7 from 6502
15	A13 from 6502	18	External Audio to system
16	A14 from 6502	17	A15 from 6502

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.

I have often seen questions about the 7800 "Super Game Cartridges". These carts have the yellow triangular logo shown above in the corner of the front label. There is a commonly held belief that this signifies that these carts are technically superior to other cartridges, but this is definitely not the case. Here is a list of the Super Game Carts and their specifications:

Name	ROM Size	RAM Size	Pokey
Ballblazer	32K	none	yes
Desert Falcon	48K	none	no
Hat Trick	48K	none	no
Impossible Mission	128K	8K	no
Karateka	48K	none	no
One-on-One Basketball	48K	none	no
Summer Games	128K	16K	no
Winter Games	128K	16K	no

As you can see there is no consistency in technical features, and there are a lot of cartridges with these same features that are not called Super Games. The only blanket statement that can be made is that none of them where standard 16K or 32K carts, they all had a little something extra. Even the Atari catalogs (Eg. CO34003 Rev. A) imply that these carts where somehow more advanced:

"The hottest titles in computer games, available for the first time on a video game system! Thanks to the 7800 Super Cartridge and its phenomenal memory storage, you can enjoy more complex game play and more excitement."

The real meaning of the Super Games designation seems to be more about marketing then technology.

Atari
Part Number	Max ROM	Max RAM	Pokey
C024926	32K	-	No
C300595	128K	-	No
C300565	128K	16K	No
C100039	144K	16K	No
C026461	32K	-	Yes
C026445	48K	-	No
C025513	32K (EPROM)	-	No
C025474	32K	-	No
C301105	512K	-	Yes
C300703	128K	-	No
C300358	Development Card

Activision
Part Number	Max ROM	Max RAM	Pokey
7800 Bankswitch	128K	-	No
0307-02	32K	-	No