I'm wondering how I can emulate the keypad that games like Bally's Atlantis & Strange science uses.
I've downloaded the manual for Strange science and found that the game uses the following keypad configuration
(note that I've used K/C for Keyboard Clear)
G K/C 0 Enter
A 1 2 3
B 4 5 6
C 7 8 9
D E F *
This is common on many of Bally's games of the same era, like Dungeons & Dragons, Atlantis, etc.
Any ideas on how to create a keypad for this and wire it properly?