collapseos/blk/300

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lblnext BSET PC ORG @ 0x1b + ! ( next )
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( This routine is jumped to at the end of every word. In it,
we jump to current IP, but we also take care of increasing
it by 2 before jumping. )
( Before we continue: are stacks within bounds? )
( PS ) HL PS_ADDR LDdn,
SP SUBHLd,
JRC, lblofl BWR ( abortUnderflow-B298 )
( RS ) IX PUSH, HL POP,
DE RS_ADDR LDdn,
DE SUBHLd,
JRC, lblofl BWR ( IX < RS_ADDR? abortUnderflow-B298 )
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E 0 IY+ LDrIXY,
D 1 IY+ LDrIXY,
IY INCd, IY INCd,
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( continue to execute )