collapseos/blk/215
2020-05-07 15:41:43 -04:00

17 lines
561 B
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( Splits word into msb/lsb, lsb being on TOS )
: SPLITB
256 /MOD SWAP
;
: PC H@ ORG @ - BIN( @ + ;
( A, spits an assembled byte, A,, spits an assembled word
Both increase PC. To debug, change C, to .X )
: A, C, ; : A,, SPLITB A, A, ;
: <<3 3 LSHIFT ; : <<4 4 LSHIFT ;
( As a general rule, IX and IY are equivalent to spitting an
extra 0xdd / 0xfd and then spit the equivalent of HL )
: IX 0xdd A, HL ; : IY 0xfd A, HL ;
: _ix+- 0xff AND 0xdd A, (HL) ;
: _iy+- 0xff AND 0xfd A, (HL) ;
: IX+ _ix+- ; : IX- 0 -^ _ix+- ;
: IY+ _iy+- ; : IY- 0 -^ _iy+- ;