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- Path: sparky!uunet!caen!uflorida!sinkhole.unf.edu!shite
- From: shite@sinkhole.unf.edu (Stephen Hite)
- Newsgroups: comp.unix.sysv386,comp.os.linux
- Subject: Followup on Nanao F550i and Diamond Speedstar 24
- Message-ID: <1992Jul22.175228.22085@sinkhole.unf.edu>
- Date: 22 Jul 92 17:52:28 GMT
- Organization: Univ. of North Florida
- Lines: 51
-
-
- I had posted a previous message earlier today describing an
- out of the ordinary moire problem I was having with my new Nanao
- F550i. I also purchased a Diamond Speedstar HIColor (the company that
- sent it to me must be sending out 24's now instead of the original
- HIColor). The problem with the DS 24 is being discussed in the comp.os.linux
- newsgroup and I suggest those reading comp.unix.sysv386 who have X386 1.2E
- and a DS 24 (or are thinking about getting one) read this discussion.
- Anyway, the short version of what's being discussed is that the DS 24
- comes with a DOS software program called VMODE which programs the card
- to send the correct vertical and horizontal scanning frequencies to the
- monitor. In my case it is a Nanao F550i.
-
- Now back to the Nanao (after talking with Nanao tech support)...
-
- The F550i uses a Mitsubishi tube. Their reason was that out of the
- 6 or so manufacturers who make 17" .28mm dot pitch tubes, they felt
- the Mitsubishi had the sharpest beam focus from corner to center. I can
- attest to this..the corners areas are as sharp as a tack (to steal PC
- Magazine's line ;-)). This increase in picture sharpness apparently
- results in moire being more of a factor. Moire is found in all monitors
- with the better focused ones possibly being more sensitive than others
- (people who have written me having the Sony Trinitron tubes have mentioned
- this).
-
- So, how can moire be controlled to "normal" levels? The answer I've
- come up with is that your timings coming from your graphics card have
- to be more precise. The reason I was experiencing these horrendous moire
- patterns in 1024x768 on the Nanao F550i when testing with et4000 Windows
- 3.1 drivers was because the Diamond Speedstar 24 was not setup correctly
- with the VMODE program. My F550i is not defective (my brain is
- dubious though ;-)). It's just much more sensitive to card timings with
- the result being manifested as obtrusive moire.
-
- Footnote: the seriousness of the moire I'm talking about doesn't get corrected
- by the usual adjusting of the vertical stretch panel control
- unless you want a *very* small 1024x768 on your nice 17" monitor. ;-)
-
- What problems still remain?
-
- Windows 3.1 is nice but frankly I'm on the Unix side of the fence at home
- much more often running X386 1.2E. The Diamond Speetstar 24's funky
- new method of programming dot clocks makes it unusable with X386 1.2E
- right now, but hopefully I can get some information from Diamond
- and pass it on to some people on the net who are much better adept at
- graphics drivers than I so this can be fixed by the next release.
-
-
-
- Steve Hite
- shite@sinkhole.unf.edu
-