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collapseos/blk/263
Virgil Dupras 31a58d00f1 z80: fix tricky memory initialization issue
Among random "better safe than sorry" changes, the real fix is in
changing "4" for "5" above _find declaration. This off-by-one error
had that word, which is the root word in z80, have a 0x01 prev field
instead of a 0x00 one.

When all memory was initialized to zero, it didn't matter, we ended
up hitting 0 prev and considered ourselves properly at the end of
dict.

When memory wasn't initialized, however, we would end up jumping at
all kinds of places, leading to random behavior.
2020-08-15 16:37:58 -04:00

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CREATE XCURRENT 0 ,
: XCON XCURRENT CURRENT* ! ;
: XCOFF 0x02 RAM+ CURRENT* ! ;
: (xentry) XCON (entry) XCOFF ;
: XCREATE (xentry) 2 C, ;
: XCODE XCON CODE XCOFF ;
: XIMM XCON IMMEDIATE XCOFF ;
: _xapply ( a -- a-off )
DUP ORG @ > IF ORG @ - BIN( @ + THEN ;
: X' XCON ' XCOFF ;
: X['] XCON ' _xapply LITN XCOFF ;
: XCOMPILE
XCON ' _xapply LITN
LIT< , FIND DROP _xapply , XCOFF ;
: X[COMPILE] XCON ' _xapply , XCOFF ;