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No More Secrets v0.91 [2016] |
AKA :
NMOS 6510 Unintended Opcodes
Credits :
Download :
Look for downloads on external sites:
Pokefinder.org
User Comment
Submitted by tlr on 19 November 2017
Quote:Re: "and may even not exist at all" - seems to me it's an issue of contradiction rather than a case of missing proof. :) You're just making the mistake of thinking digital when it's an analog behaviour.
I 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? |
User Comment
Submitted by chatGPZ on 19 November 2017
| BTW - everyone please try if the ANE opcode works as advertised on their C64s. i am looking for ppl with machines where it does not :) (you can eg use aneb.prg from lorenz suite to check, when it fails - speak up!) |
User Comment
Submitted by chatGPZ on 19 November 2017
not really. visual6502 is _not_ a proof. a bunch of details give different results there as they give on the real thing. i couldnt verify it on any of my C64s at least.
edit: now you say it... the first comment refers to all opcodes in that group. i could not prove one of them (i forgot which). will have to check again, i guess (i have a few more working C64s now too...). |
User Comment
Submitted by Krill on 19 November 2017
p. 38 (44):
For this reason you should generally keep your index in a range that page boundaries are not crossed. This anomaly seems to exist on some chips only, and may even not exist at all.
p. 41 (47):
page boundary crossing may not work as expected (the page where the value is stored may be equal to the value stored).
page boundaries: CPU/shxy/shxy1.prg
page boundary crossing anomaly: http://visual6502.org/JSSim/expert.html?graphics=f&a=0&steps=18..
Re: "and may even not exist at all" - seems to me it's an issue of contradiction rather than a case of missing proof. :) |
User Comment
Submitted by chatGPZ on 17 November 2017
| please provide a test program - nothing in this document will change unless backed up by test code :) |
User Comment
Submitted by Cruzer on 17 November 2017
| Just 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. |
User Comment
Submitted by ChristopherJam on 21 September 2017
| This is excellent, thank you. |
User Comment
Submitted by Kylearan on 16 June 2017
| Awesome, thanks a lot! Especially the appendix about opcode naming is exactly what I need right now for finishing my custom assembler/linker. :) |
User Comment
Submitted by JAC on 3 January 2017
| Even tough you update only once a year, you are still faster than the updates of my IDE. Let's see if I can change that in 2017 finally ;-) |
User Comment
Submitted by Conjuror on 28 December 2016
| Thanks for your great work here Groepaz. This is now the standard reference for this information. |
User Comment
Submitted by Viktor on 26 December 2016
Nice work.
Where can I find the FLI-Sudoku? |
User Comment
Submitted by Trap on 25 December 2016
| Great work, Groepaz. Sharing is caring. Thanks a lot!!! |
User Comment
Submitted by CRT on 24 December 2016
User Comment
Submitted by Dr.j on 24 December 2016
| wow... a lot of efforts put on this one. many thanks for the "no more secrets" document. good job for uncover the secrets of the 6510 opcodes |
User Comment
Submitted by soci on 24 December 2016
There are indeed no more secrets ;(
Btw. it's interesting to see monospaced program listings using "fi" (fi) and "fl" (fl) ligatures ;) |
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