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