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- : _prevstat [ PAD_MEM LITN ] ;
- : _sel [ PAD_MEM 1+ LITN ] ;
- : _next [ PAD_MEM 2+ LITN ] ;
-
- ( Put status for port A in register A. Bits, from MSB to LSB:
- Start - A - C - B - Right - Left - Down - Up
- Each bit is high when button is unpressed and low if button is
- pressed. When no button is pressed, 0xff is returned.
- This logic below is for the Genesis controller, which is modal.
- TH is an output pin that switches the meaning of TL and TR. When
- TH is high (unselected), TL = Button B and TR = Button C. When
- TH is low (selected), TL = Button A and TR = Start. )
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