Re: ET4000 in 16-bit Mode and 2 Screens

Article View: comp.windows.ms.programmer

Article #3438

Back to comp.windows.ms.programmer Previous Next

#3438

From: Kai-Uwe Rommel
Date: Thu, 27 Jun 1991 09:19

25 lines
1681 bytes

In article <1133@venice.SEDD.TRW.COM> press@venice.sedd.trw.com (Barry Press) writes:
>The following code will force a VGA board based on the Tseng Labs ET4000
>chip into 16-bit memory access mode.  Systems with a monochrome screen
>as well as the VGA (e.g., for use with CodeView for Windows) are normally
>shutdown to 8 bit memory access; this code restores full speed operation.

...deleted...

Well, some time ago I have written such a program too - about 20 bytes
in assembly code hacked in with DEBUG. This works well for the VGA. But
you should expect problems with your mono card. My Hercules clone after
this bus-witdh change of the VGA only works correctly, when accessed
only one byte at a time, not with word wide instructions. But CodeView
accesses it with word instructions :-((
You may have different experiences with other Hercules clone cards or
mother boards.

So, be warned ...

Kai Uwe Rommel

/* Kai Uwe Rommel, Munich ----- rommel@lan.informatik.tu-muenchen.dbp.de */

DOS ... is still a real mode only non-reentrant interrupt
handler, and always will be.                -Russell Williams

Technical Details

Message-ID: <1991Jun27.091918.17647@Informatik.TU-Muenchen.DE>

Path:

arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!caen!ox.com!math.fu-berlin.de!mailgzrz!opal!fauern!NewsServ!rommel

References: <1133@venice.SEDD.TRW.COM>

Show Full Headers

Complete Article Headers

Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!caen!ox.com!math.fu-berlin.de!mailgzrz!opal!fauern!NewsServ!rommel
From: rommel@Informatik.TU-Muenchen.DE (Kai-Uwe Rommel)
Newsgroups: comp.windows.ms.programmer
Subject: Re: ET4000 in 16-bit Mode and 2 Screens
Message-ID: <1991Jun27.091918.17647@Informatik.TU-Muenchen.DE>
Date: 27 Jun 91 09:19:18 GMT
References: <1133@venice.SEDD.TRW.COM>
Sender: news@Informatik.TU-Muenchen.DE (System)
Organization: Technische Universitaet Muenchen, Germany
Lines: 25

Reply to Parent Message