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devel / comp.lang.forth / Cooperative interrupt handlers in pure Forth

SubjectAuthor
* Cooperative interrupt handlers in pure ForthZbig
`* Re: Cooperative interrupt handlers in pure Forthminforth
 `- Re: Cooperative interrupt handlers in pure ForthHugh Aguilar

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Cooperative interrupt handlers in pure Forth

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Subject: Cooperative interrupt handlers in pure Forth
From: zbigniew2011@gmail.com (Zbig)
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 by: Zbig - Sun, 27 Aug 2023 08:22 UTC

30-years old idea — still very interesting, especially
in the era of fast CPUs/microcontrollers:
http://wilsonminesco.com/0-overhead_Forth_interrupts/

Re: Cooperative interrupt handlers in pure Forth

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Subject: Re: Cooperative interrupt handlers in pure Forth
From: minforth@arcor.de (minforth)
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 by: minforth - Mon, 28 Aug 2023 05:56 UTC

Zbig schrieb am Sonntag, 27. August 2023 um 10:22:17 UTC+2:
> 30-years old idea — still very interesting, especially
> in the era of fast CPUs/microcontrollers:
> http://wilsonminesco.com/0-overhead_Forth_interrupts/

Thanks for the link.

But FWIW I'd never blow up NEXT and polling is rarely a good idea
particularly "in the era of fast CPUs/microcontrollers". Bad carbon
footprint. ;-)

Re: Cooperative interrupt handlers in pure Forth

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Subject: Re: Cooperative interrupt handlers in pure Forth
From: hughaguilar96@gmail.com (Hugh Aguilar)
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 by: Hugh Aguilar - Wed, 30 Aug 2023 04:01 UTC

On Sunday, August 27, 2023 at 10:56:10 PM UTC-7, minforth wrote:
> Zbig schrieb am Sonntag, 27. August 2023 um 10:22:17 UTC+2:
> > 30-years old idea — still very interesting, especially
> > in the era of fast CPUs/microcontrollers:
> > http://wilsonminesco.com/0-overhead_Forth_interrupts/
> Thanks for the link.
>
> But FWIW I'd never blow up NEXT and polling is rarely a good idea
> particularly "in the era of fast CPUs/microcontrollers". Bad carbon
> footprint. ;-)

Polling is needed on the 65x because it has only one IRQ.
Garth Wilson continues to focus on the 65x in this "era of fast
CPUs/microcontrollers." If he likes it, then good for him!
He has an indirect-threaded Forth. That is very slow on the 65x!
My 65c02 cross-compiler was based on ISYS Forth and it generated
machine-code. I wrote this for my symbolic math program that did
derivatives (I didn't do integrals because they are more difficult and
because I was at the limit of what a 65c02 can do speed-wise).
There is no Forth or C or Pascal or anything else that could have
gotten as far as doing derivatives.

Machine-code on the 65c02 is bloaty (I was using the full 128K
of the Apple-IIc for my program). To have less memory usage,
such as in a micro-controller, I would like to use byte-code.
The 65c02 was a huge disappointment! They used the X register
for their byte-code table jump. The X is used for the data-stack
pointer though. They should have used Y instead. This was the
most egregious design mistake in the 65c02, but there were other
mistakes. A more thought-out design for the 65c02 would have
kept the 65x line going --- instead, the i8032 took the microcontroller
market and the 65c02 became obsolete.

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