MSX Emulators having built-in debugger

Página 3/3
1 | 2 |

Por Guillian

Prophet (3457)

imagem de Guillian

10-04-2003, 21:34

It was a question, not an afirmation Wink

Anyway, all SCC registers are undocumented as far as I know, since Konami did not released any official document/information. Some time ago I saw a photo showing what looked an official SCC document, but don't think it was released.

About built-in debugger; my vote goes for NO$MSX

Por anonymous

incognito ergo sum (116)

imagem de anonymous

10-04-2003, 22:15

Anyway I remember that R800 was said to be 100% Z80 compatible. Nevertheless there are some undocumented Z80 instructions not working fine on R800 (AFAIK).
True, the Z80 'SLL' instruction (Shift left, insert 1) which is undocumented is replaced on R800 by another undocumented instruction, TST. I should test it once... It's either a non-destructive AND, or something else. It shows the lineage of the R800, being that it's not based on a Z80, but another processor (e.g. Z800 or Z180).
If you for this reason do not want to call the R800 Z80-compatible, then the V9938 isn't TMS9918 compatible either, because it's missing some undocumented screenmodes.

Maybe this is a good issue to be continued in another thread.There's not much more to say, is there? Wink

Por anonymous

incognito ergo sum (116)

imagem de anonymous

11-04-2003, 10:10

>>If you for this reason do not want to call the R800 Z80-compatible, then the V9938 isn't TMS9918 compatible either, because it's missing some undocumented screenmodes.

Of course I think R800 is Z80-compatible! What I mean is that using undocumented features may be 'dangerous' in some cases (though it happens rarely) Smile

Por sjoerd

Hero (602)

imagem de sjoerd

11-04-2003, 13:18

True, the Z80 'SLL' instruction (Shift left, insert 1) which is undocumented is replaced on R800 by another undocumented instruction, TST. I should test it once... It's either a non-destructive AND, or something else. It shows the lineage of the R800, being that it's not based on a Z80, but another processor (e.g. Z800 or Z180).

TST == non-destructive AND Evil

Por k0ga

Expert (77)

imagem de k0ga

11-04-2003, 19:47

I can say that r800 isn't all 100% compatible with z80, thus sll instruction dont't work on r800 a game that iam didn't work on this mode on 2 o 3 years, and nobody known why. Did you remember this Guillian? Evil

Por Guillian

Prophet (3457)

imagem de Guillian

12-04-2003, 00:14

I didn't, but I do Wink
Yes, you told me something about it... why?

Anyway, today I started my new SCC detection rutine. I hope it could be used to improve openMSX (an others, of course)

Por k0ga

Expert (77)

imagem de k0ga

12-04-2003, 13:31

I didn't, but I do Wink
Yes, you told me something about it... why?

I ask you about if the problem could be undocument instruction of z80, but you said me that all undocument instruction was made document on r800. How i thought that you was a msx guru I lookup on other things.I lost 2 years of my life for youuuuuu Crying

Y dice el KNM que tu web es una paja, que no funcionan los enlaces y no se actualiza y tal y tal ...
Tongue

Por Guillian

Prophet (3457)

imagem de Guillian

12-04-2003, 18:11

>>
I ask you about if the problem could be undocument instruction of z80, but you said me that all undocument instruction was made document on r800. How i thought that you was a msx guru I lookup on other things.I lost 2 years of my life for youuuuuu

I'm astonished :|
It is not fair to blame me about it. (I don't remember exactly it, but...) If it took 2 years to find that bug, you are the worts coder I have seen XD


Y dice el KNM que tu web es una paja, que no funcionan los enlaces y no se actualiza y tal y tal ...
Tongue

Astonished again!

All links (in the link section) works perfect. So, why don't you test it by yourself before complaining? If there is any problem, just tell me it, I'll fix it. Easy. Tongue

Página 3/3
1 | 2 |