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- Path: sparky!uunet!mcsun!uknet!strath-cs!sproven
- From: sproven@cs.strath.ac.uk (Simon B Proven IE91)
- Newsgroups: comp.sys.acorn
- Subject: Re: VIDC20!!
- Message-ID: <10909@baird.cs.strath.ac.uk>
- Date: 10 Nov 92 13:55:04 GMT
- References: <1992Nov9.113146.12042@waikato.ac.nz> <1992Nov9.110501.1@cc.curtin.edu.au> <1992Nov9.133838.17133@wam.umd.edu>
- Sender: news@cs.strath.ac.uk
- Organization: Comp. Sci. Dept., Strathclyde Univ., Glasgow, Scotland.
- Lines: 48
- Nntp-Posting-Host: hunter-08
-
- In article <1992Nov9.133838.17133@wam.umd.edu> rsrodger@wam.umd.edu (Yamanari) writes:
- >In article <1992Nov9.110501.1@cc.curtin.edu.au> sdaveyj@cc.curtin.edu.au writes:
- >>Hey! Has every body read acorn.sys.announce! VIDC20
- >>
- >>Wow, just what I have always wanted. 32Bit! suck eggs PC's cheap per chip
- >>too, 28bit pallete!
- >
- > When I read the annoncement, I was fairly impressed, but I noticed
- > that it didn't really give any hard core information.
-
- Yes it did - you just have to read between the lines.
-
- >
- > <i.e. what is the maximum resolution at 32 bits per pixel>
-
- Given max bandwidth of 160Mb/sec, you can get 32bpp 1024x768 at 50Hz
-
- or 800x600 at 60Hz
-
- (I *think*)
-
- This is a back-of-envelope calculation, and 1024x768 is very close to the
- limit (150Mb/sec) and I've not taken account of flyback, so 1024x768 may be
- a nono, but 800x600 will work at 32bpp, as it only needs 109Mb/sec bandwidth
- which is well within spec
-
- :)
-
- > The other thing I noticed is that, other than the hardware cursor,
- > there was no mention whatsoever as to whether it had hardware
- > assisted graphics--i.e. bitblt, and so on.
-
- Which means it doesn't. In other words, to get fast graphics systems, you
- need a separete ARM600 coprocessor just to draw to the frame buffer.
-
- > If Acorn wants into the PC graphics biz, they'll have to provide
- > at least some graphics accelleration...
-
- I'd call that ARM700 :)
-
- > Robert Stephen Rodgers || rsrodger@wam.umd.edu || IRC: Yamanari
-
- mad@bike
- --
- * Simon Proven - 3rd Year student of Computer and Electronic Systems at the *
- * University of Strathclyde, Glasgow, Scotland G1 1XQ *
- * Secretary, University of Strathclyde Green Group *
- * sproven@cs.strath.ac.uk REAL (tm) peeps ride bike :) *
-