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chatGPZ
Registered: Dec 2001
Posts: 11391 |
Release id #161035 : No more Secrets v0.92
since someone had the great idea to close comments on the old entry so i cant reply (remove the fucking comment feature and *replace* it by the forum already....) and the update is out i'll do that here:
Quoting tlrI guess that's the source of Visual6502's discrepancies as well. I might be wrong here but AFAIK it doesn't try to model the analog behaviour at all. Does ANE give any of the $ee stuff in it?
visual6502 is completely digital, it doesnt really emulate the transistors correctly (that would require an insane amount of resources and would probably be really really slow) so the analog effects related to that do not apply (as in dont work). also things like crosstalk between neighbour traces that are not actively driven by another output (this is likely where this "magic constant" comes from, and also where the BA/DMA related anomalies of other opcodes relate to) are not emulated/do not work.
Quoting CruzerJust tested page crossing with SHX/SHY on a real machine, and the page indeed changes to the value stored. So you can drop the "and may even not exist at all" on page 38.
Quoting KrillRe: "and may even not exist at all" - seems to me it's an issue of contradiction rather than a case of missing proof. :)
you were right - i have removed this in the update. whats true though is that this behaviour is not (extensively) tested by the existing test programs. i'd still like to see one that verifies that this behaviour is infact correct for all pages and stored values (or at least all that can be tested) |
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Broti
Registered: Aug 2004
Posts: 15 |
Top notch christmas present! |
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Smasher
Registered: Feb 2003
Posts: 521 |
what Broti said/typed. |
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Copyfault
Registered: Dec 2001
Posts: 478 |
Great as always!
I also second the idea of having a proper test suite for the sha/shx/shy-page crossing behaviour. |
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chatGPZ
Registered: Dec 2001
Posts: 11391 |
also someone make more elaborated tests for ANE and LAX #imm ! |
