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

>
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

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