7800 Cartridge Info

Cartridge pinout

1	R/W	0 = Write/1 = Read	32	CLK2	Phi 2 buffered clock from CPU
2	Halt	Halts the CPU	31	IRQ	IRQ to the CPU
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	Audio from the cart
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.

Atari cartridge boards

C024926 - simple rom board

Board layout in postscript (10 KB ZIP). EPROM modified board layout in postscript (12 KB ZIP).
BS - partside, LS - solder side, P - part info

Centipede CX7801, C300048-001A 
DigDug CX7803, C300048-003A
Ms. Pac Man CX7807, C300038-007A
Pole Position II CX7808, CO28408-01
Xevious CX7810, C028410A-38
Joust CX7806, C300049-006A (resistor in series with +5v)
Robotron CX7809, C300049-009A (resistor in series with +5v)

C025474

Pole Position II CX7808, early releases

C026445

Karateka CX7822

C026461 - POKEY board, 3 jumpers, Ballblazer only

Ballblazer CX7815, C300049-015A-01, jumpers: 1-2, 1-2, on

C100339 - Supercart, 8 jumpers
U1 - main rom
U2 - 74LS02
U3 - 74LS10
U4 - secondary rom/RAM
U5 - 74LS374

W2 & W6 & W7 - mutually exclusive
W2 - read only rom in 8000-FFFF area, /CS low
W6 - read only rom in 8000-FFFF area, CS high
W7 - linear rom in 4000-FFFF area, /CS low

W3 & 74LS10 mutually exclusive
W3 - additional ROM in 4000-7FFFF area, CS high

W4 & W5 - mutually exclusive
W4 - 64k or smaller rom. Pin 22 is /OE connected to /CS
W5 - 128k rom. Pin 22 is A16 from Q7

W1 & W8 are connected when not using bankswitching

Real Sports Baseball CX7834, C300514-034A, jumpers: 01000000, no ram
Donkey Kong CX7848, C300050-048A, jumpers: 10010011, just U2
Donkey Kong Junior CX7849, C300050-049A, jumpers: 10010011, just U2
Hat Trick CX7829, C300050-029A, jumpers: 11010011, just U2
Crossbow CX7844, C300048-044A/C300051-044B, jumpers: 01001000, all chips

C301105 - POKEY board, Commando only

Commando CX7838

C300565 - Supercart, 6 jumpers, space for RAM

W1 & W2 - mutually exclusive
W1 - using linear, non banked rom
W2 - bankswitched rom

W3 & W4 - mutually exclusive
W3 - using 128kb rom (pin 22 is A16)
W4 - using smaller rom (pin 22 is /OE, connected to /CS)

W5 & W6 - connected when not using bankswitching

Donkey Kong CX7848, C300050-048A, jumpers: 100111, just U2
Barnyard Blaster CX7859, C300051-059A, jumpers: 011000
Crack'ed CX7836, C300051-036A, jumpers: 011000
Dark Chambers CX7837, C300051-037B, jumpers: 011000
Jinks CX7857, C300051-057A, jumpers: 011000, RAM
Tower Toppler CX7856, C300050-056A, jumpers: 010100, RAM
Winter Games CX7831, C300051-031A, jumpers: 011000, RAM

Alien Brigade CX7855, PAL ?, jumpers: ??????
Barnyard Blaster CX7859, PAL ?, jumpers: ??????
Crossbow CX7844, PAL ?, jumpers: ??????
Desert Falcon CX7811, PAL ?, jumpers: ??????
Donkey Kong CX7848, PAL ?, jumpers: ??????
Donkey Kong Jr. CX7849, PAL ?, jumpers: ??????
Food Fight CX7804, PAL ?, jumpers: ??????
Galaga CX7805, PAL ?, jumpers: ??????
Hat Trick CX7829, PAL ?, jumpers: ??????
Joust CX7806, PAL ?, jumpers: ??????
Mario Bros. CX7850, PAL ?, jumpers: ??????
One On One CX7824, PAL ?, jumpers: ??????
Super Huey CX7828, PAL ?, jumpers: ??????
Xevious CX7858, PAL ?, jumpers: ??????
Impossible Mission CX7857, PAL ?, jumpers: ??????, RAM
Jinks CX7857, PAL ?, jumpers: ??????, RAM
Tower Toppler CX7856, PAL ?, jumpers: ??????, RAM

C300595 - Small supercart, no jumpers, no RAM

Mat Mania Challenge CX7863, C300051-063A
Midnight Mutants CX7889, C300051-089A
Ninja Golf CX7870, C300051-070A
Scrapyard Dog CX7879, C300051-079A
Xenophobe CX7858, PAL C300712-058A

C300703

Board layout in postscript (25 KB ZIP)

Karateka CX7822, PAL

Guessed ROM sizes:

C300048 - 16k
C300049 - 32k
C300050 - 64k
C300051 -128k