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- Path: nntp.teleport.com!sschaem
- From: sschaem@teleport.com (Stephan Schaem)
- Newsgroups: comp.sys.amiga.programmer,comp.sys.amiga.games,alt.sys.amiga.demos,in,comp.sys.amiga.advocacy,comp.sys.amiga.hardware,comp.sys.amiga.misc,comp.sys.amiga.graphics
- Subject: Re: Possible loss of the Copper (was Re: AB3D II beats Quake....)
- Followup-To: comp.sys.amiga.programmer,comp.sys.amiga.games,alt.sys.amiga.demos,in,comp.sys.amiga.advocacy,comp.sys.amiga.hardware,comp.sys.amiga.misc,comp.sys.amiga.graphics
- Date: 1 Apr 1996 06:24:00 GMT
- Organization: Teleport - Portland's Public Access (503) 220-1016
- Distribution: world
- Message-ID: <4jnsq0$9hd@nadine.teleport.com>
- References: <4iu7hb$utt@coranto.ucs.mun.ca> <2726.6661T189T1181@mbox.vol.it> <4jmd7b$jdn@dole.uninett.no> <4jnmfe$cj1@harbinger.cc.monash.edu.au>
- NNTP-Posting-Host: julie.teleport.com
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-
- Bernd Meyer (bmeyer@bruce.cs.monash.edu.au) wrote:
- : : Fabio Bizzetti (bizzetti@mbox.vol.it) wrote:
- : : : You know how you can open a 1024*768 logical screen on Amiga, and scroll it on
- : : : a 640*512 physical screen? 50 frames / sec scroll, with 0 CPU or AGA time.
- : :
- : : : On a SVGA the scroll would be 2 frames / sec, with 100% CPU and SVGA use.
- : :
- : *Grin* Then how do you explain the fact that my X-Server is running a
- : 1400x1300 "logical" screen and is scrolling it over a 320x200, a 320x240,
- : a 640x480, a 800x600 or a 1024x768 physical screen by just changing the
- : (gasp) start of video memory address? With normally around 80 frames /sec
- : scroll (I don't run with less than 80Hz vertical refresh ;-), and almost 0
- : CPU time?
-
- Maybe he thinks svga card are limited to 512k? 1024x768 even in 8bit
- need more then 512k so he would imagine that the data would be copied
- via the CPU from main mem to the card via the isa bus? :)
- What else could he be thinking when there is so many proof in the PC game
- realm of horizontal, vertical, 8way smooth HW scroller.
-
- Stephan
-