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collapseos/blk/284
Virgil Dupras d1de99d8c9 z80: implement stack overflow error condition
Also, remove underflow checks from next: it's taxing and useless
because underflow check already takes place in each relevant native
word.
2020-08-08 08:08:05 -04:00

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PC ORG @ 1 + ! ( main )
SP PS_ADDR LDdn, IX RS_ADDR LDdn,
( LATEST is a label to the latest entry of the dict. It is
written at offset 0x08 by the process or person building
Forth. )
BIN( @ 0x08 + LDHL(n),
SYSVARS 0x02 ( CURRENT ) + LD(n)HL,
HERESTART [IF]
HL HERESTART LDdn,
[THEN]
SYSVARS 0x04 + LD(n)HL, ( RAM+04 == HERE )
DE BIN( @ 0x04 ( BOOT ) + LDdd(n),
JR, L1 FWR ( execute, B287 )