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collapseos/blk/827
Virgil Dupras 723d3c4249 pcat: all native words implemented!
(well, not PC@ and PC!, but I'm not even sure what would be the role
of these in a PC/AT. they're only used in drivers on the z80 front,
so they will not be immediately needed. todo... )

Now comes the fitting part.
2020-06-19 08:10:51 -04:00

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442 B
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CODE 0 AX AX XORxx, AX PUSHx, ;CODE
CODE 1 AX 1 MOVxI, AX PUSHx, ;CODE
CODE -1 AX -1 MOVxI, AX PUSHx, ;CODE
CODE 1+ DI SP MOVxx, [DI] INC[w], ;CODE
CODE 1- DI SP MOVxx, [DI] DEC[w], ;CODE
CODE 2+ DI SP MOVxx, [DI] INC[w], [DI] INC[w], ;CODE
CODE 2- DI SP MOVxx, [DI] DEC[w], [DI] DEC[w], ;CODE
CODE RSHIFT ( n u -- n )
CX POPx, AX POPx, AX SHRxCL, AX PUSHx, ;CODE
CODE LSHIFT ( n u -- n )
CX POPx, AX POPx, AX SHLxCL, AX PUSHx, ;CODE