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

Sources:
Dan Boris
Atari Historical Society
Eckhard Stolberg
Lee
Mitch Orman
Graham Percy
Torsten Schall
All postscript board data generated by Scooter PCB Back (c) 1998-2004 Jindroush Last modified: Tue Dec 10 22:26:44 2002