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collapseos
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Mirror of CollapseOS
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collapseos/blk/290

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  1. lblchkPS BSET ( chkPS )

  2.     ( thread carefully in there: sometimes, we're in the

  3.       middle of a EXX to protect BC. BC must never be touched

  4.       here. )

  5.     EXX,

  6. ( We have the return address for this very call on the stack

  7.   and protected registers. 2- is to compensate that. )

  8.     HL PS_ADDR 2- LDdi,

  9.     SP SUBHLd,

  10.     EXX,

  11.     CNC RETc, ( PS_ADDR >= SP? good )

  12.     ( continue to uflw )

  13. lbluflw BSET ( abortUnderflow )

  14.     DE BIN( @ 0x06 ( uflw ) + LDd(i),

  15.     JR, lblexec BWR