🚀 go-pugleaf

I'm trying to piece together a working computer from some electronic junk.
I have a 1991 AMI BIOS board with an AMD 386DX40 and 4 MB RAM. I have
connected the board to the power supply of an ancient IBM PC.
Now I tried to add a graphics card. I've tried two different ones, both
of them 8 bit cards:

the first one is from a Tandom 286, the second one from an IBM PC (8086).
Both have the same two row DSUB (I think that's what they are called)
plug (similar to VGA's three row plug). I have a monitor (yellow
monochrome picture) which has the correct cable. When I first powered
on with either of the cards I got two messages. The first one said the
usunal stuff that I had to reconfigure in the BIOS (and in fact the
computer automatically went on to the BIOS afterwards), the second one
said "DISPLAY SWITCH NOT PROPER <F1>". What does that second message
mean?
The first card was recognized by the BIOS as an EGA/VGA card, the second
one as a MONOCHROME card. After saving that BIOS setup the first message
in both cases was gone, while the second one remained. Apart from that
message, everything seems to work though (I haven't tried anything but
text mode).

Needless to say I don't have any documentation. Both graphics cards don't
seem to have any jumpers.

What is the source of that message? How can I make it go away? Does it
indicate some memory address or IRQ conflict?

Any hints are welcome. Thanks.
-- 
Georg Schwarz (schwarz@physik.tu-berlin.de, kuroi@cs.tu-berlin.de, PGP 2.6ui)
Institut f�r Theoretische Physik  +49 30 314-24254   FAX -21130  IRC kuroi
Technische Universit�t Berlin            http://home.pages.de/~schwarz/