home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.sys.amiga.programmer,comp.sys.amiga.hardware
- Message-ID: <xX+NXMD4FC8aaz6@_crisi.blackbox.shnet.org>
- From: CRISI@BLACKBOX.shnet.org (Christian )
- Path: blackbox.shnet.org!CRISI
- Organization: .oO PHANTASM Oo.
- Subject: Re: ChipRAM speed increases?
- Date: Mon, 01 Apr 1996 13:08:23 +0200
- X-Mailer: MicroDot 1.10 [REGISTERED 004fc8]
- References: <4j2udt$h4h@daily-planet.execpc.com>, <4j6sog$hnh@sunsystem5.informatik.tu-muenchen.de>
- X-Gateway: ZCONNECT US genepi.shnet.org [UNIX/Connect v0.71]
- MIME-Version: 1.0
- Content-Type: text/plain; charset=ISO-8859-1
- Content-Transfer-Encoding: 8bit
-
- It was 25.03.1996 at 18:38:56 when fischerj@informatik.tu-muenchen.de (Juergen "Rally" Fischer)
- wrote about "Re: ChipRAM speed increases?":
-
- JF> make a simple alternative code that fills a screen with writepixelarray8(),
- JF> which does a chunky dump to screen, and it will fly on gfx-cards.
-
- No, it won't. On my A4000/060/Buster11 copying into gfxcard memory is
- performed with 7-8 MB/s on a Piccolo Z2/Z3 and with 11 MB/s on a
- Cybervision, while chunky-to-planar into chip memory performs with 5.5
- MB/s which is enough for one-frame c2p on a 320x256 screen (accessing the
- bitplanes directly, not via the OS). Yes, a Cybervision is 2x faster, but
- I wouldn't call this "flying".
-
- The problem is not the gfxcard's internal speed, the problem is the
- slow interface to the Zorro3 slot (which can be very much faster,
- AFAIK).
-
- Greetings
-
- --
- Christian Wasner (CRISI/PHANTASM)
- crisi@blackbox.shnet.org
- Sorry, but you haven't won a cookie in today's lottery
-