DOS ain't dead

I changed my mouse from PS/2 to USB. When building a program by VP (Virtual Pascal) in dos, using HX dos extender, I move the mouse, the computer resets. What could be causing this? Some bug in UEFI/BIOS or in HX. When I used a PS/2 mouse it didn't happen.

> I changed my mouse from PS/2 to USB. When building a program by VP (Virtual
> Pascal) in dos, using HX dos extender, I move the mouse, the computer
> resets. What could be causing this? Some bug in UEFI/BIOS or in HX. When I
> used a PS/2 mouse it didn't happen.

Did you check that the mouse works ok for real-mode programs?

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MS-DOS forever!

> Did you check that the mouse works ok for real-mode programs?

The mouse works (except the wheel). I found that the problem occurs only in the configuration with the UMBPCI driver.

> > Did you check that the mouse works ok for real-mode programs?
>
> The mouse works (except the wheel). I found that the problem occurs only in
> the configuration with the UMBPCI driver.

Perhaps UMBPCI is a bit too "aggressive" and steals a range that's used by the BIOS's "USB legacy" code. UMBCHK might give further hints...

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MS-DOS forever!

> I changed my mouse from PS/2 to USB. When building a program by VP (Virtual
> Pascal) in dos, using HX dos extender, I move the mouse, the computer
> resets. What could be causing this? Some bug in UEFI/BIOS or in HX. When I
> used a PS/2 mouse it didn't happen.

Apropos: Does anybody know, what happened to http://vpascal.ning.com/?

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Forum admin

> Apropos: Does anybody know, what happened to
> http://vpascal.ning.com/?

Allan Mertner told me today:
Hi Robert,
I'm not sure anyone uses it any longer; there is a Facebook group that has almost no traffic, but that's about it. Ning decided they wanted too much money for it to be worth keeping it there.
Cheers, Allan

So, if anybody wants to setup a new community, please share a link.

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Forum admin

> > > Did you check that the mouse works ok for real-mode programs?
> >
> > The mouse works (except the wheel). I found that the problem occurs only
> in
> > the configuration with the UMBPCI driver.
>
> Perhaps UMBPCI is a bit too "aggressive" and steals a range that's used by
> the BIOS's "USB legacy" code. UMBCHK might give further hints...

The problem also occurs when I do not load the UMBPCI driver. Stack overflow is likely occurring on mouse movement. Same with M$DOS and FreeDOS. FreeDOS sometimes displays a memory block violation or invalid instruction execution message.
When I load one of the drivers (JEMM, QEMM or EMM386) this does not happen. In CONFIG.SYS I have set STACKS=9,256

> When I load one of the drivers (JEMM, QEMM or EMM386) this does not happen.

That's a rather strong indication that it's NOT a real-mode stack overflow.

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MS-DOS forever!

> So, if anybody wants to setup a new community, please share a link.

https://forum.lazarus.freepascal.org

Seriously, the Ning to facebook move was quite a while ago, but there hasn't been much content there.