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Path: utzoo!watmath!clyde!burl!ulysses!gamma!epsilon!zeta!sabre!petrus!bellcore!decvax!decwrl!pyramid!chronon!eric
From: eric@chronon.UUCP (Eric Black)
Newsgroups: net.micro.amiga
Subject: Re: AmigaFest--San Diego
Message-ID: <167@chronon.UUCP>
Date: Mon, 3-Mar-86 13:50:16 EST
Article-I.D.: chronon.167
Posted: Mon Mar  3 13:50:16 1986
Date-Received: Fri, 7-Mar-86 07:44:25 EST
References: <1361@caip.RUTGERS.EDU> <122@hp-sdd.UUCP>, <367@mips.UUCP>
Organization: Chronon Computer Corp., Mtn. View, CA
Lines: 34


>[ ... ]
>
>>I didn't notice any significant speed up (they were running the bouncing ball 
>>demo) while using the '020 board.  The salesman says -- "Watch.  I'll enable
>>the cache. See (he enables the cache) the speed increase??". no.
>
>Nick -
>
>Do you know if the 020 board had the on-board 256K of 32-bit memory or not?
>Also, I assume this was the 7+ MHz board, and not the 14+ MHz board CSA is
>supposed to R&D'ing ... is that correct?
>
>/kim
>

That's not the point!  As has been thoroughly described on the net, in
BYTE magazine, and numerous other places, the bouncing ball demo is done
by LOOKUP TABLE ANIMATION, i.e. the ball is made to appear to rotate by
manipulating the color lookup tables.  The ball moves by using the hardware
scrolling capabilities of the Amiga graphics (independent bitplane pointers).
The demo consists of the 68000 loading things up, waiting for a while, changing
some pointers and registers, waiting a while, changing some pointers and
registers, waiting a while, ...

I guess the 68020 could wait faster.  With the fast cache, even yet still
more fasterer! :^)
-- 
Eric Black   "Garbage In, Gospel Out"
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