Path: utzoo!utgpu!news-server.csri.toronto.edu!clyde.concordia.ca!uunet!mcsun!unido!mpirbn!p554mve
From: p554mve@mpirbn.UUCP (Michael van Elst)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: A500/14 MHz 68k?
Keywords: Accelerator speed increase faster power
Message-ID: <943@mpirbn.UUCP>
Date: 2 May 90 15:02:25 GMT
References: <8903@chaph.usc.edu> <10630@cbmvax.commodore.com> <3596@pikes.Colorado.EDU> <3673@minyos.xx.rmit.oz>
Reply-To: p554mve@mpirbn.UUCP (Michael van Elst)
Organization: Max-Planck-Institut fuer Radioastronomie, Bonn
Lines: 23

In article <3673@minyos.xx.rmit.oz> rxtajp@minyos.xx.rmit.oz (Andrew Pettifer) writes:
>Kramden SI reports performance of:
>Integer 1.8   times A1000
>Floeting 1.4  times A1000
>After trying several programs like Aegis Drawplus, and sculpt 3d,
>i am very dissappointed, the speed up seems to only be about 5%.
>Hardly worth the effort.

In this case, the memory cycles will slow down the operation of the
68000. You can either build a faster memory and operate twice as fast
as an normal Amiga except for anything that runs in chip memory.

A second approach does give about 70-80% speedup on average programs and
will affect kickstart operations as well. This is a cache for the CPU.
A direct-mapped cache is easily built. You'll need some fast cache tag rams
plus the cache memory itself and three pals. This has been done for the
Atari ST for a while.

-- 
Michael van Elst
UUCP:     universe!local-cluster!milky-way!sol!earth!uunet!unido!mpirbn!p554mve
Internet: p554mve@mpirbn.mpifr-bonn.mpg.de
                                "A potential Snark may lurk in every tree."