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Jemm v5.66 : exception 09 on Intel P4 w/ Ultra IDE BIOS ext. (DOSX)

posted by Rugxulo Homepage, Usono, 06.09.2007, 13:32

> this dump is interesting:
>
> EFL=4B415453 is "impossible". In ASCII it is "STAK".
>
> OTOH, 3206 for CS is also very unlikely, but 3206 is a very common value
> for the flags register (and this value also tells that interrupts are
> enabled).
For the record, JEMM386 or JEMMEX work fine on my other cpus (P166, 486), yet last night at my aunts' house, seems my disk #1 / JEMM386 didn't like their P4 (HP, 2 Ghz, 512 MB RAM) b/c using JEMM386 at all seemed to scroll really fast / indefinitely with some error msg ("invalid opcode"??) over and over again. It required a manual power down / up via power button (Ctrl-Alt-Del didn't work). That is definitely weird to me since it doesn't do that on other cpus. And it's the same disk image! (I don't think it was corrupted floppy b/c HIMEMX alone or whatever seemed to work fine, and I tried running pretty much everything as expected / successfully.) Of course, this could be my fault with the "I=TEST" or whatever, and I only really tried normal EMS setup and then NOEMS (neither worked), not the "safe" setup.

The other thing I noticed is that it took a lot longer to change video modes than, say, my P166 (but even my own P4 at home seemed to be kinda slow too). Also, not that you care, but the tiny VIEWGIF (which worked everywhere else) didn't work at all (monitor not compatible with that mode?? no idea, actually).

> There is a chance that loading 386SWAT can show more details (the
> EIP register content). Or, if 386SWAT cannot help, a slight
> modification in Jemm will display this register.
Before it crashes? Are you just thinking outloud or actually suggesting I do this preemptively? (Obviously can't do so after the crash.) I dunno, it's all very strange.

---
Know your limits.h

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