collapseos/blk/387
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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( handle backspace: go back one char in IN>, if possible, then
emit BS + SPC + BS )
: _bs
( already at IN( ? )
IN> @ IN( = IF EXIT THEN
IN> @ 1- IN> !
BS SPC BS
;
( del is same as backspace )
: BS? DUP 0x7f = SWAP 0x8 = OR ;
: KEY
0x55 RAM+ @ ( (key) override )
?DUP IF EXECUTE ELSE (key) THEN ;
( cont.: read one char into input buffer and returns whether we
should continue, that is, whether CR was not met. )