🚀 go-pugleaf

LF>> Lo and Behold - whenever the second monochrome video card
  >> is plugged into its slot, my main monitor slows down by at least 40%. Whene
  >> it is removed, the system behaves normally.

LF>Only if you could get a 16-bit mono (MDA or Hercules comp.) video card,
  >and those are real hard to come by.

LF>If anyone out there got a pointer to any such adapter, I'd really
  >appreciate a hint !

I have had this problem for some time and there may be a
workaround for some. On some VGA cards it is possible to force
them back into 16 bit mode.

This also forces the system to think the mono card is 16 bit so
the attribute bytes don't get written to it (although some things
manage to write to them, I have a full screen flashing mono
display next to me now, wish I knew how so I could clear it!).

For Trident cards it is possible to force them into 16 bit mode using
the TVGACRTC.SYS driver.

I use an ATI graphics ultra clone at the moment and I can toggle
16 bit mode from the command line

to force 8 bit mode:-
mov dx,1ce
mov ax,20b3
out dx,ax
int 20

and load ax with 00b3 to force 16 bit mode. The 1ce is the ultra
control port address which you are supposed look in the video BIOS
for (can't remember exactly how).

Cheers Terry...
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 . OLX 2.2 . terry.harris@almac.co.uk