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- Path: sparky!uunet!pipex!unipalm!uknet!axion!pcellik
- From: pcellik@axion.bt.co.uk (Peter SPHINX Cellik)
- Newsgroups: comp.sys.ibm.pc.hardware
- Subject: Re: Programming VGA in extended modes
- Message-ID: <1992Aug19.100510@axion.bt.co.uk>
- Date: 19 Aug 92 09:05:10 GMT
- References: <ABalFagSL8@speech.lang.lgu.spb.su>
- Sender: news@axion.bt.co.uk
- Reply-To: pcellik@axion.bt.co.uk (Peter SPHINX Cellik)
- Organization: British Telecom Research Labs
- Lines: 34
-
-
- In article <ABalFagSL8@speech.lang.lgu.spb.su>, shura@speech.lang.lgu.spb.su (Alexander L. Gorlovsky) writes:
- |>
- |> Hi, guys!
- |>
- |> Have your any information on Video RAM organization
- |> for VGA Extended modes for 512K or 1M :
- |> 640 x 480/256
- |> 800 x 600/16
- |> 800 x 600/256
- |> 1024 x 768/4
- |> 1024 x 768/16
- |> Is it the same for various VGA cards (I have Trident VGA with 512K RAM) ?
- |>
-
- The only extended mode that is quite standard across all SVGA boards is
- 800x600-16.
- As far as I have seen, this mode is organized just like 640x480-16. You
- use the same port commands to set the read/write mask, latches, etc. So
- for this mode, all you have to do is know the mode number (which does vary
- from card to card) and set the mode using INT 0x10. All further access to
- the video RAM and registers should be the same.
-
- As for the other extended modes, I have only successfully programmed them
- on an ATI VGA WONDER 512K (yes I know, old card, but soon I hope to get the
- new kick-ass ATI card. ATI is great!).
-
- Hope you can use this info,
- SPHINX
-
- ====================================================
- === Kill others only if you wish to be killed. ===
- === SPHINX ===
- ====================================================
-