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- Path: sparky!uunet!sun-barr!cs.utexas.edu!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!rutgers!cbmvax!spence
- From: spence@cbmvax.commodore.com (Spencer Shanson)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: AGA scan rates
- Message-ID: <37136@cbmvax.commodore.com>
- Date: 18 Nov 92 18:56:00 GMT
- Organization: Commodore, West Chester, PA
- Lines: 42
-
- In article <1eb7iiINN1sf@swrinde.nde.swri.edu> kent@stanley.nde.swri.edu (Kent D. Polk) writes:
- >I finally got my A4000.
- >
- >Question:
- >Why are the monitor mode scan rates different for the A4000 than for the A3000?
- >For example:
- >
- >A3000 DblNTSC - 59Hz, 29.2 kHz
- >A4000 DblNTSC - 58Hz, 27.66 kHz
- >
- >A3000 SUPER72 - 72Hz, 24.62 kHz
- >A4000 SUPER72 - 71Hz, 23.21 kHz
-
- In order to allow smooth horizontal scrolling in the productivity type modes on
- an A4000, it is necessary to drop the refresh rates to the rates you have shown.
- However, if you can live without smooth horizontal scrolling in these modes, or
- you have a monitor that cannot handle the sync rates, then copy the VGAOnly
- monitor from sys:storage/monitors to devs:monitors and reboot. This is not
- really a monitor in the sense of Super72, DblNTSC etc, but is really just a flag
- to tell the OS that 'Hey, I can't handle these non-standard sync rates, so
- please do something about it'.
-
- >What's going on? I don't have the articles anymore, but I know good and well
- >that I remember several talking about using Super72 at 24.62 kHz on the
- >A4000. Before I get really peeved, I thought maybe there's something wrong
- >with this particular A4000 to cause it to generate the lower scan rates.
- >Can AGA not support these scan rates???
-
- Super72 will require a real multisync that can handle 24kHz.
-
- >Kent Polk: Southwest Research Institute
- >Internet : kent@swrinde.nde.swri.edu
- >UUCP : $ {cs.utexas.edu, gatech!petro, sun!texsun}!swrinde!kent
-
-
- --
- ---------------------------------------------------------------------------
- Spencer Shanson - Amiga Software Engineer | email: spence@commodore.COM
- | or uunet!cbmvax!spence
- All opinions expressed are my own, and do not | Bix: sshanson
- (necessarily) represent those of Commodore. | Have you Wobbled a
- | Weeble today?
-