SYM-1 EPROM Programmers, FORTH etc

Dallas Shell · Joined: 18 Nov 2002 Posts: 13

I have updaded my website with quite a few items including:

1. Many more SYM DOS disk utilities.

2. I have listed 5 or 6 different EPROM programmers, both hardware and software.

3. A couple of versions of FORTH for the SYM including disk I/O routines.

4. Five or six other utilites.

The material is at www.gbronline.com/n5fee/

Feel free to take a look and email me if you have questions.
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Dallas Shell
SYM-1
web pages moved to 6502.org

cas · Joined: 21 May 2003 Posts: 26 Location: Germany

Hi Dallas,

do you know if the 6502 Sourcecode for the FORTH Systems on your website is available (TinyFORTH, FlexFORTH)?

Best regards

Carsten

Dallas Shell · Joined: 18 Nov 2002 Posts: 13

Carsten,

It has been a long time since I fooled with the FORTH on the SYM, but as I remember it, I have a comple printout of the FLEX FORTH that I ran on the SYM. I beleive it is the same code as the FIG group published. I looked thru a lot of the screens and it all looked the same. The reason I used the FLEX was I was given a KIM format tape of the object code and that saved a lot of typing. I will be glad to get the copy out and answer any other questions. It is in a three ring binder and I think was about 1/2 inch of paper and would not be too difficult to copy if you need.

Dallas
_________________
Dallas Shell
SYM-1
web pages moved to 6502.org

GARTHWILSON · Posted: Tue May 27, 2003 6:35 am Post subject:

> I beleive it is the same code as the FIG group published.

Then it probably has the UM/MOD bug which gives wrong answers with high input numbers. Mike has posted my fix at

http://www.6502.org/source/integers/ummodfix/ummodfix.htm

The 6502 FIG model left a lot to be desired; but of course one of the beauties of Forth is that you can get under the hood and modify it to your heart's content.

There's a really cool, simple way to implement re-entrant, high-level Forth interrupt service on the 6502 with zero overhead too, which I have used on my workbench computer. It does not require setting up separate stacks or anything most people initially think would be necessary. I'll try to get the article posted here on www.6502.org later. I got it published in the Jul/Aug '94 issue of Forth Dimensions magazine; but FIG was a non-profit group and is either dead or in a coma now, so I'm sure there'd be no problem. Actually what I'm using now does have a small amount of overhead and allows easy installation, deletion, prioritizing, and listing of multiple Forth ISRs on the fly. My 65816 version allows doing this with assembly-language ISRs as well, so you can do both, typically leaving the assembly-language ISRs for only the most speed-critical jobs.

Garth

cas · Joined: 21 May 2003 Posts: 26 Location: Germany

cas · Joined: 21 May 2003 Posts: 26 Location: Germany

GARTHWILSON · Posted: Tue Feb 01, 2005 8:52 am Post subject:

> I would love to see this article.

It's finally up.
http://6502.org/tutorials/zero_overhead_forth_interrupts.html

> Actually what I'm using now does have a small amount of overhead
> and allows easy installation, deletion, prioritizing, and listing of multiple
> Forth ISRs on the fly.

The article doesn't go to this depth, but presents the basics of the simple zero-overhead high-level-Forth interrupt-service method so the reader can implement it without much difficulty.