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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!hobbes!md
- From: md@sco.COM (Michael Davidson)
- Subject: Re: Orchid chip docs
- Organization: The Santa Cruz Operation, Inc.
- Date: Wed, 16 Dec 1992 20:11:32 GMT
- Message-ID: <1992Dec16.201132.11846@sco.com>
- References: <1galfvINNgc5@agate.berkeley.edu> <kssNVB3w165w@hale.cts.com> <1992Dec16.183918.18188@micom.com>
- Sender: news@sco.com (News admin)
- Lines: 43
-
-
- jscott@micom.com (James Scott) writes:
-
- >i just got off the phone with the folks at Orchid. does anyone know
- >of an ftp site from which i could download the tech docs on their
- >graphics chip (for the farenheit). if not, i guess i'll just cough
- >up the $25 they require.
-
- It probably would be a good idea to get the documentation, however
- there are a couple of pieces of information that you may find useful.
-
- The S3 86C911 is essentially a single-chip "near-clone" of the IBM
- 8514 which also supports all of the standard VGA modes (unlike the
- IBM 8514 which requires a separate VGA card to be present) and a
- number of SVGA modes.
-
- While the 86C911 is *not* an exact clone of the 8514 it is extremely
- close. If you already know how to program an 8514 at the register
- level you will have no problems with the S3 chip. If you *don't*
- know how to program an 8514 you should probably go and buy one of
- the 8514 programming books that are available (the S3 chip documentation
- will tell you what all of the registers do, but it doesn't have much
- in the way of practical examples of *how* to use them). If you already
- have code for the 8514, then adapting it to the S3 chip should be
- trivial.
-
- The main differences between the S3 chip and the 8514 are as follows:
-
- 1) The S3 chip supports all of the standard VGA modes and some SVGA
- modes - the 8514 doesn't (it requires that you have a real VGA or
- SVGA present)
-
- 2) The S3 chip is programmed into it's extended modes differently
- from the 8514 (the F1280 card has a VESA BIOS so putting the
- card into it's extended modes shouldn't be a problem).
-
- 3) The S3 chip doesn't support the 8514 color compare register or
- the 8514 fixed pattern registers.
-
- Apart from these differences it is essentially functionally identical
- to an 8514 - same registers at the same addresses etc ....
-
- Hope this is of some help
-