Re: LisaEm 1.0.0-RC2 Available for download

From: gilles <gilles.fetis_at_email.domain.hidden>
Date: Sat, 07 Jul 2007 10:59:18 -0700

the most precise 68k core is the musashi (this is the core I choosed after 2 tries (first one was the Castaway 68k core, then I tried scream)). But It's not easy to compare since status bits are not handled in the same way.

I did this kind of job in the past to debug a java 6809 core. I traced all the registers at every instruction. I then compared the results.

I've noticed a problem with ROM selection in your new version. I had to edit the conf file. This affects the Win32 version (I run XP pro).

On 5 juil, 22:13, Ray Arachelian <r..._at_email.domain.hidden> wrote:
> gilles wrote:
> > Since my emulator doesn't have the LOS srcollbar problem, I suspect a
> > 68000 bug in yours. To be more precise, I think something is wrong in
> > the status register and/or the DCB opcodes.
> It's not likely the BCD opcodes since LOS doesn't seem to execute any of
> those.
> It's also unlikely to be one of the shift opcodes (ASL, LSL, ASR, ROL,
> ROR, etc.) as those were previously debugged against a 68040. I thought
> perhaps that this might be because of differences between the 040 and
> 000, but replacing the code for these from another 68K core doesn't fix
> the issue either.
> It's also not the ROXL/ROXR opcodes, those don't get executed around the
> routines involved.
> I see some adds and multiplies, but those execute ok, and nothing after
> them checks the status flags.
> Looking through the trace logs, it seems that it stores/caches the
> display address for these, so I have to catch the bit of code that
> decides where to draw them, rather than the code that is drawing them,
> which looks ok.
> Whatever it is, it's affecting the Desk menu as well, and I suspect some
> copy & pasting.
> If I can't find it in a reasonable chunk of time, I'll have to merge a
> second CPU core and run them in parallel.

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. Received on 2015-07-15 16:37:28

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