chip8 had hexadecimal keyboard like on the right, here is the mapping:
1234 ---> 123C
QWER ---> 456D
ASDF ---> 789E
ZXCV ---> A0BF
Additional keys specific to oxi8:
Enter ---> Reset game
Backspace ---> Back to game listing
Space ---> Pause game
I ---> Enter/Exit Debug mode
O ---> When in debug mode, print CPU state, decrement timers, execute 1 instruction
+/= ---> Increase CPU Hz by 10
_/- ---> Decrease CPU Hz by 10
0 ---> Set CPU Hz to Chip-8 default of 500hz
9 ---> Set CPU Hz to SChip default of 1000hz
oxi8 git repo here
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