In the figForth source, it is stated the value 0xD25E0004, or 0x00045ED2, is 6502 encoded in radix-36. I've probably made a mistake in my attempts to duplicate the values I've found hard-coded in the figForth source, but I've been unable to verify the values after several permutations of the input to the Python base36encode() I located on the internet. That routine yields an encoded string of '50M'. My hand calculations also yield the same answer. At the moment, I can't see a way to realize the values found in the figForth source.

Does anyone know how to calculate the value found in the figForth source?

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Michael A.

6*36*36*36+5*36*36+0*36+2 = 286418 = $45ed2

Thanks. Certainly did not try that approach, but your solution clearly matches the value in the figForth source.

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Michael A.

It's easy enough to check in Forth:

Jim:

Thanks. At my level of Forth competency, I would not have thought of that particular solution either.

Again, thanks to you and Lee for taking the time to answer my question.

At the moment, I am working to convert figForth that I picked up from this site, and got running on my M65C02 core, to use the expanded instruction set represented in my second core: M65C02A. I am plugging along in the conversion, which I suppose is going pretty well. It has been hampered somewhat by my lack of understanding of the Forth VM and the design of the FIG dialect. The primary issue with my conversion effort has been adding support for the various instructions, addressing modes, and assembler operations required by the figForth source. However, I think that I've got the assembler in a state of development that it supports what's needed to complete the porting of figForth to use the M65C02A instruction set. When that's complete, I hope to test the result in the py65 environment. Perhaps then, I may gain a better understanding of Forth.

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Michael A.

If you would like to take a look at figForth before your project is finished and have a Commodore 64 emulator, 64Forth for the Commodore 64, with user manual, is a superset of figForth.

I hadn't stumbled across that neat package before; thank you!

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Got a kilobyte lying fallow in your 65xx's memory map? Sprinkle some VTL02C on it and see how it grows on you!

Mike B. (about me) (learning how to github)

Thanks for the link. Will take a look at it. figForth or any Forth is not my primary objective at the moment. Instead the objective is to exercise the Forth VM and supporting instructions in the M65C02A core. If they work well and improve performance, then my near term objective has been met.

As discussed in another thread, the current structure of the Forth VM and its supporting instructions make the implementation of EXECUTE somewhat awkward, so the current effort to get figForth running in py65 is driven primarily by the desire to get the Forth VM out of the way. It would be interesting to get any Forth running within the py65 environment that I've forked from Mike Nabarez's py65. It certainly was a milestone to get the Pascal Sieve of Eratosthenes program running, and I expect that getting figForth running will provide the same sense of satisfaction.

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Michael A.

Maybe it will grow on you.

It might at that.

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Michael A.

It's one of the Forths on the "Taygeta C64 Forths" page linked in my links page's Forth section.

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http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
What's an additional VIA among friends, anyhow?