collapseos/arch/z80/sms/blk/621
Virgil Dupras 7001446212 Complete overhaul of recipes
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.
2020-10-30 20:39:39 -04:00

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: (ps2kcB) ( for port B )
( Port B TL is bit 2 )
0xdd PC@ 0x04 AND IF 0 EXIT ( nothing ) THEN
0x3f PC@ DROP 0b01110111 ( Port B TH output, low ) 0x3f PC!
0xdc PC@ ( bit 7:6 go in 1:0 ) 6 RSHIFT ( n )
0xdd PC@ ( bit 1:0 go in 3:2 ) 0x03 AND 2 LSHIFT OR ( n )
0b11110111 ( Port B TH output, high ) 0x3f PC!
0xdc PC@ ( bit 7:6 go in 5:4 ) 0xc0 AND 2 RSHIFT OR ( n )
0xdd PC@ ( bit 1:0 go in 7:6 ) 0x03 AND 6 LSHIFT OR ( n )
( Port A/B reset ) 0xff 0x3f PC!
;