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Also, remove underflow checks from next: it's taxing and useless because underflow check already takes place in each relevant native word.
16 lines
575 B
Plaintext
16 lines
575 B
Plaintext
lblnext BSET PC ORG @ 0x1b + ! ( next )
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( This routine is jumped to at the end of every word. In it,
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we jump to current IP, but we also take care of increasing
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it by 2 before jumping. )
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( Before we continue: are we overflowing? )
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IX PUSH, EX(SP)HL, ( do EX to count the IX push in SP )
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SP SUBHLd, HL POP,
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IFNC, ( SP <= IX? overflow )
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SP PS_ADDR LDdn, IX RS_ADDR LDdn,
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DE BIN( @ 0x13 ( oflw ) + LDdd(n),
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JR, L3 FWR ( execute, B287 )
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THEN,
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LDA(BC), E A LDrr, BC INCd,
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LDA(BC), D A LDrr, BC INCd,
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( continue to execute )
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