ExBus Protoboard Card PCB

Want to hack together your own ExBus Card? This Protoboard Card provides the logic to participate in the ExBus addressing protocol, breaks out useful signals, and features a 100mil grid of plated through-holes to put whatever you want to wire up.

Note: Batch 1 of this card had a design error that required scratching out a trace and soldering a wire between two chip legs. These cards will arrive pre-scratched, but you'll need to add the wire as part of assembling the board.

Note 2: The card select signal isn't individually broken out on this version, but it is still easily accessible on pins 12 and 13 of U6. Similarly, you'll need to tap into a bypass capacitor footprint to power your design.

Parts kit contents: https://www.digikey.com/en/mylists/list/H7M66JSUJE

"ExBus" short for Expansion Bus is the name I gave to a multiplexing protocol for PC-style addon cards to the GameTank. ExBus cards get access to 12 bidirectional I/O lines from the rear expansion port, and this access can be shared between multiple other cards that are connected simultaneously. 

ExBus is not required for most GameTank games.