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d041b91846
Use EXX instead of the stack for HL protection and remove all spurious uses of chkPS, I wanted to inline chkPS in next because of its "tight loop" status, but for reasons I don't understand, doing so breaks Collapse OS. Later...
16 lines
529 B
Plaintext
16 lines
529 B
Plaintext
CODE (?br) ( 0x67 )
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HL POPqq,
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HLZ,
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JRZ, L2 BWR ( BR + 2. False, branch )
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L1 BSET ( loop will jump here )
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( True, skip next 2 bytes and don't branch )
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IY INCss, IY INCss,
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JPNEXT, NOP, NOP, NOP,
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CODE (loop) ( 0x77 )
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0 IX+ INC(IXY+), IFZ, 1 IX+ INC(IXY+), THEN, ( I++ )
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( Jump if I <> I' )
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A 0 IX+ LDrIXY, 2 IX- CP(IXY+), JRNZ, L2 BWR ( branch )
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A 1 IX+ LDrIXY, 1 IX- CP(IXY+), JRNZ, L2 BWR ( branch )
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( don't branch )
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IX DECss, IX DECss, IX DECss, IX DECss, JR, L1 BWR
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