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collapseos/blk/493
Virgil Dupras bf4ab0f1b4 z80: protect or avoid BC wherever it's used
For the IY->BC move, of course.
2020-07-05 23:12:17 -04:00

17 lines
390 B
Plaintext

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