Booting form a ISA PG-1281 on a ITOX3 mobo

Webbermans

Hello all,

I bought a ITOX3 motherboard as replacement for a pentium 1 board.
I use a PG-641/1281 in an ISA slot on this motherboard.
The PG-641/1281 is a Professional Graphics Adaptor made in 1985 by Matrox.
This motherboard doesn't recognize the PG-641 at al
Putting it back in the Pentium 1 it works.
When I enable the onboard VGA, the motherboard boots with the onboard VGA without concerning about the PG-641.
When I diable the onboard VGA, the system seems to boot but I don’t see anything on the screen attached to the PG-641.
No beeps saying “Oh my god! There is no video card, let me beep to the user that I cant communicate with the user” Wink

By the way, this is also the case with no display adaptor in the system and the onboard on disable.
Seems a bit strange to me.
The only thing I know about this PG-641, is that it presents itself as a plain old CGA card.
Also when I put a plain old CGA card in an ISA slot, I get the same result.
So I think it has something to do with the BIOS on the ITOX board.
For your information, I need this motherboard as a replacement for controlling some equipment in our factory.
The system boots with dos.
The graphic part of the software that is provided with this machine is specifically written for this PG-641.
The rest of the cards is also ISA.
We need to upgrade to a newer version of the controlling software and that requires a new faster pc.
There is no update available to work with other graphic cards.

Who has an answer?

sulbert · Master Flasher Joined: 17 Jul 2002 Posts: 204

Did you try to change the Video option in Standard CMOS Features?