Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!sdd.hp.com!spool.mu.edu!agate!usenet.ins.cwru.edu!gatech!bloom-beacon!eru!hagbard!sunic!news.funet.fi!hydra!klaava!cc.helsinki.fi!osmoviita From: osmoviita@cc.helsinki.fi Newsgroups: comp.sys.ibm.pc.hardware Subject: Re: Tseng Labs 3000 compatible with 4000 chips? Message-ID: <1991May22.234259.1@cc.helsinki.fi> Date: 22 May 91 21:42:59 GMT References: <1514@balrog.ctron.com> Sender: news@klaava.Helsinki.FI (Uutis Ankka) Distribution: comp Organization: University of Helsinki Lines: 49 In article <1514@balrog.ctron.com>, dj@ctron.com (DJ Delorie) writes: > 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) I put same images by same program to Orchid PrDesigner II with 512kB and Everex Viewpoint VRAM with 1MB -- both based on Tseng 4000 -- using Tseng 3000 driver. Orchid w 512k showed images without the black bars and Everex w 1M had the black gaps. Is it so that Tseng 4000 can use memory like Tseng 3000 when it has only 512kB memory? Kari Osmoviita