Atari 7800 Cartridge PCB C300565

Replica of the original Atari C300565 cartridge PCB.

C300565 is the catalog number for one of the boards that Atari used in 7800 cartridges — classified by collectors as type 7 and type 9, also known as "Supercart": a version without RAM chips and a version with a complete set of components. This board was used for larger games utilizing memory bank switching, hosting titles like Jinks, Tower Toppler, or Winter Games. It is identified by six jumpers W1–W6 — other Supercarts (C100339) had eight, while the smaller variant C300595 had none.

The jumpers are there to allow one board to support various configurations: ROM size, addressing method, and RAM presence. Each game had its own jumper setup, and without proper configuration, the cartridge wouldn't work.

This project recreates that board, with two practical enhancements:

• Retains the original W1–W6, allowing replication of any game configuration from this family.
• Adds jumper W7, which supplies Vcc to the MASKROM — this enables the board to accommodate both the original chip from a dismantled cartridge and modern flash memory 39SF020 or 39SF040 (for 39SF040, pin 1 must additionally be grounded).

Project link:
https://www.pcbway.com/project/shareproject/Atari_7800_cartridge_C300565_bc3a5c2e.html