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collapseos
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Mirror of CollapseOS
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  1. : _prevstat [ PAD_MEM LITN ] ;

  2. : _sel [ PAD_MEM 1+ LITN ] ;

  3. : _next [ PAD_MEM 2+ LITN ] ;

  4. 

  5. ( Put status for port A in register A. Bits, from MSB to LSB:

  6. Start - A - C - B - Right - Left - Down - Up

  7. Each bit is high when button is unpressed and low if button is

  8. pressed. When no button is pressed, 0xff is returned.

  9. This logic below is for the Genesis controller, which is modal.

  10. TH is an output pin that swiches the meaning of TL and TR. When

  11. TH is high (unselected), TL = Button B and TR = Button C. When

  12. TH is low (selected), TL = Button A and TR = Start. )