Path: utzoo!attcan!uunet!willett!ForthNet
From: ForthNet@willett.UUCP (ForthNet articles from GEnie)
Newsgroups: comp.lang.forth
Subject: Atari ValForth
Message-ID: <457.UUL1.3#5129@willett.UUCP>
Date: 13 Feb 90 02:31:57 GMT
Organization: Latest link in the ForthNet chain.  (Pgh, PA)
Lines: 19


 Date: 02-09-90 (23:44)              Number: 2888
   To: ALL                           Refer#: NONE
 From: BEN FINKELSTEIN                 Read: (N/A)
 Subj: 6502 FIG FORTH BUG            Status: PUBLIC MESSAGE

 Garbage points in a fractal generating program I wrote on my 8-bit ATARI
 in val-FORTH led to a discovery of a bug in the multiply routine.  4094
 4097 U* and 4097 4094 U* give different results, one of which is wrong,
 that is, in single digits!  I found the same bug in s*p*a*c*e fig forth
 and ELCOMP's Power-Forth, two other fig dialects.  Is this bug common to
 all 6502 fig FORTHs?  Is it longstanding common knowledge or did I
 discover something?  The bug is easily patched; it's a missed carry in
 the code definition.

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