Routines
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F6FA: Read Keyboard Rows
Used by the routines at Read_Control_Keyboard_Combined and Read_Control_Keyboard_Split.
Shared keyboard row subroutine. Reads port EFFE into C and port F7FE into A.
Read_Keyboard_Rows F6FA LD A,$EF Read from the keyboard;
Port Number Bit
0 1 2 3 4
EF 0 9 8 7 6
F6FC IN A,($FE)
F6FE LD C,A Stash the EFFE row result in C.
F6FF LD A,$F7 Read from the keyboard;
Port Number Bit
0 1 2 3 4
F7 1 2 3 4 5
F701 IN A,($FE)
F703 RET Return.
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