13 lines
416 B
Plaintext
13 lines
416 B
Plaintext
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lblchkPS BSET ( chkPS )
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( Note that you only need to call this in words that push
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back to PSP. If they don't, calling chkPS is redundant with
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check in next )
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EXX,
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( We have the return address for this very call on the stack
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and protected registers. 2- is to compensate that. )
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HL PS_ADDR 2- LDdn,
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SP SUBHLd,
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EXX,
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CNC RETc, ( PS_ADDR >= SP? good )
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JR, lblofl BWR ( abortUnderflow-B298 )
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