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From: ForthNet@willett.pgh.pa.us (ForthNet articles from GEnie)
Newsgroups: comp.lang.forth
Subject: Selecting a Public Domain Kernel
Message-ID: <1763.UUL1.3#5129@willett.pgh.pa.us>
Date: 20 Sep 90 02:35:40 GMT
Organization: String, Scotch tape, and Paperclips.  (in Pgh, PA)
Lines: 25


 Date: 09-18-90 (13:07)              Number: 3796 (Echo)
   To: JEFFERY WOOD                  Refer#: 3795
 From: PETE KOZIAR                     Read: NO
 Subj: FORTHS                        Status: PUBLIC MESSAGE

 Actually, it's a little bit more complicated, in that I think Brodie 
 switched FORTHs between editions.  The first edition uses FORTH-79 (the 
 Fig-FORTH model), and the second edition uses the FORTH-83 model. 
 They're pretty close; the major differences a new programmer would see 
 are: 

     1. Truth has the value of 1 in FORTH-79, and -1 in FORTH-83. 
     2. Empty loops work different -- the infamous 0 0 DO.  I have never 
         used FORTH-79, but I believe 0 0 DO executed 0 times, and I 
         know it executes 65536 times in FORTH-83. 

 A good, public-domain FORTH-83 is F83 for the IBM PC (otherwise known 
 as Laxon/Perry F83 after its authors).  I don't know what's out there 
 for the VIC-20. 
 ---
  * Via Qwikmail 2.01  The Baltimore Sun 
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