home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.sys.amiga.misc
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!destroyer!gumby!yale!yale.edu!jvnc.net!darwin.sura.net!nntp.msstate.edu!tacky.cs.olemiss.edu!skip
- From: skip@tacky.cs.olemiss.edu (Skip Sauls)
- Subject: Re: Vhat? No flickerfixer in A4k? Vhat ees thees?
- Message-ID: <1992Nov17.151427.20626@ra.msstate.edu>
- Sender: news@ra.msstate.edu
- Nntp-Posting-Host: tacky.cs.olemiss.edu
- Organization: University of Mississippi, Dept. of Computer Science
- References: <BxtLp7.JnE@usenet.ucs.indiana.edu> <1992Nov16.202918.25113@ra.msstate.edu> <tpang.721974222@sfu.ca>
- Date: Tue, 17 Nov 1992 15:14:27 GMT
- Lines: 49
-
- In article <tpang.721974222@sfu.ca> tpang@fraser.sfu.ca (Tsui Ting Debbie Pang) writes:
- >skip@tacky.cs.olemiss.edu (Skip Sauls) writes:
- >>True, the A4000 has no flicker-fixer hack, but it does have something much
- >>better called the AGA chipset and the 3.0 system software. The reason that
- >>they did not put one in the A4000 is that it is not only an expensive part,
- >>it is also a hack which has some problems.
- >
- >I don't see any big problem on my A3000. My monitor overscans correctly.
-
- The problems are with the half-line flicker and the breakup of the pointer
- when it is moved.
-
- >>The A4000's method of flicker-fixing in software and hardware has several
- >>advantages over the A3000 approach. First, the annoying 1/2 line flicker
- >>is gone, as is the jitter when a pointer is moved quickly. Also, every
- >>screen is centered properly on the display and looks better than the A3000
- >>does when using the same monitor.
- >
- >So when you are using a HiResInterlace mode, what is the output hor.
- >frequency? Does it interlace? If it is not de-interlaced, then I'd imagine
- >flicker exists.
-
- I am using dblNTSC High Res No Flicker. The resolution is 640x400, with
- 676x473 in overscan. The horizontal frequency is 29.2kHz and the vertical
- frequency is 59Hz. The Multiscan Productivity mode is 640x480, with 31.44kHz
- horizontal and 60Hz vertical frequencies. The Euro 72Hz Productivity mode
- has 640x400 resolution, with 31.43kHz horizontal and 70Hz vertical.
-
- >What method the A4000 treats the interlace mode in 640x400 for example? This
- >is the mode I use most, with overscan.
-
- Every screen is promoted to a non-interlaced dblNTSC mode, including badly
- written software such as DPaint IV.
-
- >>A word to the wise: Don't listen to what MB and others might say. They
- >>have shown time and again that they are not only annoying, they are also
- >>just plain ignorant of the facts.
- >>
- >I know the AGA outputs the 640x400 in 31kHz, non-interlaced, thus the mode
- >promotion. May be you just didn't mention that mode. And I have thought
- >all along it was done with flicker fixing circuit!
-
- No flicker-fixer, just native AGA and the 3.0 OS.
-
- >David Tse
-
- Skip Sauls, Amiga Advocate
- skip@tacky.cs.olemiss.edu
-
-