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Recipes contain bits and pieces of hardware-related knowledge, but these bits feel sparse. I've been wanting to consolidate hardware- related documentation for a while, but always fell at odds with the recipes organisation. We don't have recipes anymore, just a /doc/hw section that contains hardware-related documentation which often translate to precise instructions to run Collapse OS on a specific machine. With this new organisation, I hope to end up with a better, more solid documentation.
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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