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- Path: sparky!uunet!pipex!unipalm!uknet!almac!terry.harris
- From: terry.harris@almac.co.uk (Terry Harris)
- Newsgroups: comp.os.ms-windows.programmer.tools
- Subject: UN: *BIG* problems with *
- Message-ID: <832.934.uupcb@almac.co.uk>
- Date: 24 Jan 93 19:01:00 GMT
- Reply-To: terry.harris@almac.co.uk (Terry Harris)
- Organization: Almac BBS Ltd. +44 (0)324 665371
- Lines: 39
-
- 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...
- ---
- . OLX 2.2 . terry.harris@almac.co.uk
-
-