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collapseos/arch/z80/trs80/blk/603
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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CODE (key)
A 0x01 LDri, ( @KEY )
0x28 RST,
PUSHA,
;CODE
CODE (emit) EXX, ( protect BC )
BC POP, ( c == @DSP arg ) chkPS,
A 0x02 LDri, ( @DSP )
0x28 RST,
EXX, ( unprotect BC ) ;CODE
CODE AT-XY EXX, ( protect BC )
DE POP, H E LDrr, ( Y )
DE POP, L E LDrr, ( X ) chkPS,
A 0x0f LDri, ( @VDCTL ) B 3 LDri, ( setcur )
0x28 RST,
EXX, ( unprotect BC ) ;CODE