m740 Support #2707
m740 Support #2707
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So, it passes the regression test (that i added/updated too). One odd thing is that "inc a" and "dec a" are right now swapped (in both the assembler and the disassembler) - ie the documentation (that pdf) has them the other way around than currently implemented. This seems to follow the general logic of 6502 clones - however, we need to confirm whether this is really correct for the m740. @roberto314 do you remember anything about that? |
works too, and gives an identical file... now about the inc a/dec a.... |
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So, for me this is mostly fine... let the dogs out, please comment - perhaps something can be done more elegant, please tell :) |
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I am a bit surprised that I was asked to review -- my expertise is the simulator part of the codebase, and I know very little if anything about the other tools. Please proceed without my input :) |
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removed some more unrelated stuff from the patch. Already spotted a few more little things - more for tomorrow :) |
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@kugelfuhr perhaps you can skik over it as well? :) (Why cant i add you as reviewer? bleh) |
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so there is the test. it got a bit out of hand :) A few more quirks show up, but they should be fixed in another PR (and the test updated) |
…ics ans ca65 uses seems like a good idea :)
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ok thats it for me, will merge soon if noone steps in :) |
not sure which PDF you're referring to. i found this, if it is helpful: |
< 9E88 p dir="auto">not sure which PDF you're referring to. i found this, if it is helpful: https://bitsavers.org/components/mitsubishi/melps/1989_Series_740_Software_Users_Manual.pdf Thats the one, indeed. (@roberto314 linked to it in #986 ) It seems weird the INC A/DEC A doesn't follow the usual pattern. @roberto314 did you find any other software we could disassemble? |
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Sorry, no luck. The code from the programmable logic unit is inside the
m50747, not in a ROM.
Also the chip is in some chess computers, but there is also no external ROM.
mit freundlichen Grüßen.
Ing. Robert Offner MSc.
Bob Andrews ***@***.***> schrieb am Fr., 20. Juni 2025, 17:13:
… *mrdudz* left a comment (cc65/cc65#2707)
<#2707 (comment)>
One odd thing is that "inc a" and "dec a" are right now swapped (in both
the assembler and the disassembler) - ie the documentation (that pdf) has
them the other way around than currently implemented. This seems to follow
the general logic of 6502 clones - however, we need to confirm whether this
is really correct for the m740.
not sure which PDF you're referring to. i found this, if it is helpful:
https://bitsavers.org/components/mitsubishi/melps/1989_Series_740_Software_Users_Manual.pdf
Thats the one, indeed. ***@***.*** <https://github.com/roberto314>
linked to it in #986It seems) weird the INC A/DEC A doesn't follow the
usual pattern.
@roberto314 <https://github.com/roberto314> did you find any other
software we could disassemble?
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OK, thanks anyway.... too bad :) So i'll merge it as is - we'll see |
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Which opcode or opcodes are we talking about?
mit freundlichen Grüßen.
Ing. Robert Offner MSc.
Bob Andrews ***@***.***> schrieb am Fr., 20. Juni 2025, 19:39:
… Merged #2707 <#2707> into master.
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in the pdf $1a is "dec a", and $3a is "inc a" - however, that does not match the usual encoding scheme, which is why the assembler (and disassembler) currently uses $3a for "dec a" and $1a for "inc a". unfortunately the software you dumped does not contain either, so no way to even guess what is correct. can you actually run software on that thing for a test? should be easy to find out then :) |
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I' ll think about it and get back to you.
mit freundlichen Grüßen.
Ing. Robert Offner MSc.
Bob Andrews ***@***.***> schrieb am Fr., 20. Juni 2025, 19:59:
… *mrdudz* left a comment (cc65/cc65#2707)
<#2707 (comment)>
Which opcode or opcodes are we talking about?
in the pdf $1a is "dec a", and $3a is "inc a" - however, that does not
match the usual encoding scheme, which is why the assembler (and
disassembler) currently uses $3a for "dec a" and $1a for "inc a".
unfortunately the software you dumped does not contain either, so no way to
even guess what is correct.
can you actually run software on that thing for a test? should be easy to
find out then :)
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Did you see this? |
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yes, the pdf in itself is consistent |
took #986 and made all opcodes work
Basic roundtrip (disassemble/assemble) works now. Some docs are missing. Some more cleanup is needed perhaps :)