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collapseos/blk/299

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2020-04-23 11:19:12 +10:00
PC ORG @ 0x1e + ! ( chkPS )
HL PUSHqq,
( We have the return address for this very call on the stack
and protected registers. 4 - is to compensate that. )
HL PS_ADDR 4 - LDddnn,
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SP SUBHLss,
HL POPqq,
CNC RETcc, ( PS_ADDR >= SP? good )
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JR, L2 BWR ( abortUnderflow-B298 )