home *** CD-ROM | disk | FTP | other *** search
- Path: dtek.chalmers.se!d1joe
- From: d1joe@dtek.chalmers.se (Jonas Ekstr|m)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: Picasso and graphic garbage
- Date: 4 Mar 1996 14:41:09 GMT
- Organization: Chalmers univ. of Technology
- Message-ID: <4heve5$ifk@nyheter.chalmers.se>
- References: <4gsnvu$s23@nyheter.chalmers.se> <1354.6632T1237T2718@defcen.gov.au>
- NNTP-Posting-Host: crast.dtek.chalmers.se
-
- stewart@defcen.gov.au (Stewart Skelt) writes:
-
-
- >On 27-Feb-96 02:43:42 Jonas Ekstr|m wrote:
-
- >>I recently installed a Picasso II, 2 MB in my A2000. All the colors
- >>and the resolution are nice but there is one major problem I haven't
- >>manage to solve - graphic garbage.
-
- >>When I start a program sometimes parts of the active display, usually
- >>the Workbench, is destroyed by random colors. This garbage always
- >>appear in horizontal bands and can be removed with a redraw of the
- >>destroyed area.
-
- ><snip>
-
- >>Has anyone else experienced this problem? Any theories from you out
- >>there are very welcome. Solutions even more.
-
- >Yes! I had what sounds like EXACTLY the same problem and I spent months trying
- >to track it down. Like you I have an A2000 with a GVP Combo 030/22. Eventually
- >I got a Guru-ROM. This in itself did not solve the problem but the version of
- >GVPSCSICTRL which comes with the Guru-ROM includes an option to turn off SCSI
- >DMA. I put GVPSCSICTRL NODMA in s:user-startup, and the problem was gone. The
- >SCSI access is subjectively a little bit slower but not too bad. And the clean
- >graphics are a great improvement.
-
- So the whole thing is a DMA problem. I suppose then that GVP are the
- one to blame and there is nothing wrong with my A2000 or Picasso.
- Still, there are people with GVP cards and Picassos working. Could
- it be a problem with our motherboards? Mine is a rev 6.2.
-
- I've heard about this Guru-ROM, it replaces the ROM from GVP on the
- Combo, right? Is it expensive?
- Are there other benefits? What made you buy it, the Picasso trouble
- or something else?
-
- I suppose the Guru-ROM is needed for the NODMA, the new GVPSCSICTRL alone
- isn't enough, is it?
-
- >I suggest you try it - let me know if it works for you.
-
- Thanks, I'll check it out. Maybe it's time for a Blizzard 2060 anyway :-).
-
- --
- __ | Jonas Ekstr|m Chalmers University of Technology
- __///I need a 486...| d1joe@dtek.chalmers.se Computer Science and Engineering
- \XX/to play games on| http://www.dtek.chalmers.se/~d1joe NX650 - DoD #1835
-