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FORTH for the SHARP PC-E500 (S)
10-10-2021, 09:11 AM
Post: #29
RE: FORTH for the SHARP PC-E500 (S)
I am able to read and understand assembly language. I have already written smaller assembly routines and can certainly learn a lot from you. At the moment, however, I would first like to report on my experiences from the point of view of a Forth500 user.

Your implementation of toupper and tolower shown above does not work for me. It throws exception # -13: undefined word with toupper as the first entry in the dictionary. The old implementation with the addition of DUP and SWAP works:
Code:
: toupper   ( char -- char ) DUP [CHAR] a [CHAR] { WITHIN IF $20 - THEN ;
: tolower   ( char -- char ) DUP [CHAR] A [CHAR] [ WITHIN IF $20 + THEN ;
: strupper  ( string len -- ) 0 ?DO DUP I + DUP C@ toupper SWAP C! LOOP DROP ;
: strlower  ( string len -- ) 0 ?DO DUP I + DUP C@ tolower SWAP C! LOOP DROP ;

I was also able to run the RC4 cipher program from the wikipedia entry for Forth without any problems.
(see https://en.wikipedia.org/wiki/Forth_(pro..._language)

When using WORDS, it happened to me that a BREAK via the ON key crashed the computer. I think that's what happens when the ON button bounces. And there is always an exception #-28 for "user interrupt", which is not so nice. Is it possible to use another key especially for WORDS, for example C-CE, for normal exit without exception? That would help a lot if you just want to look at the new words.
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Messages In This Thread
FORTH for the SHARP PC-E500 (S) - Helix - 09-06-2021, 11:41 PM
RE: FORTH for the SHARP PC-E500 (S) - dmh - 10-02-2022, 02:29 PM
RE: FORTH for the SHARP PC-E500 (S) - Klaus Overhage - 10-10-2021 09:11 AM



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