It works very similar to the Family Basic Keyboard, but with different scan codes.
This code works on FCEUX and real hardware with my ReproPak board (blatant advertising!).
The basic idea is strobe the keyboard through $4016 like a controller, then read nibbles through $4017. Each bit is a key up (0) or down (1). Writes to $4016 pick the row/column.
Zip includes asm file, graphics .chr file, and assembled .nes to use in emulators.
Download the Zip File
Brian Parker
www.retrousb.com
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