Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!samsung!balrog!ctron.com From: dj@ctron.com (DJ Delorie) Newsgroups: comp.sys.ibm.pc.hardware Subject: Re: Tseng Labs 3000 compatible with 4000 chips? Message-ID: <1514@balrog.ctron.com> Date: 21 May 91 13:46:07 GMT References: Sender: news@balrog.ctron.com Reply-To: dj@ctron.com Distribution: comp Organization: None whatsoever Lines: 40 Nntp-Posting-Host: bragi In article , cg108dbd@icogsci1.ucsd.edu (Steve -Social Hacker) writes: > --=}>> On 20 May 91 19:23:13 GMT, tgtbtk@rw9.urc.tue.nl (A. Kuiper) said: > > TK> My SVGA adapter uses TsengLabs 4000 chipset, some software only supports > TK> TsengLabs 3000 chipset it seems that the 4000 chipset is not compatible with > TK> the 3000 chipset. > TK> What should i do to run 3000 chipset software on a Tsengabs 4000 SVGA adapter? > > TK> Toine Kuiper, tgtbtk@chem.tue.nl > > I'm definately no expert on this, but it seems to me that often when I > run TS 3000 software on my ET4000's (BOCA & STB), there are often > large gaps in the screen horizontally. This only happens in the > extended modes, and I have yet to see a ET4000 program do this. Here's the difference betwixt the two: There is a single register in the TSENG chips that determines which 64K bank you're accessing. This register has different bit meanings, since the '3000 supports 512K and the '4000 supports 1M. '3000: x x R R R W W W (R&W may be swapped, I forget) '4000: R R R R W W W W Note that they overlap by a bit - this causes the funny blank bars across the screen every inch or so. The only way to run '3000 software is to upgrade the drivers, or patch the '3000 driver to compensate for the moved bits. DJ dj@ctron.com (Happy '4000 owner)