Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cs.utexas.edu!uunet!cbmvax!cbmehq!cbmger!peterk
From: peterk@cbmger.UUCP (Peter Kittel GERMANY)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Bank switched CHIP RAM?  (Re: 24 Bit Video ..)
Keywords: Off the wall idea?
Message-ID: <489@cbmger.UUCP>
Date: 9 Oct 90 07:27:03 GMT
References: <1990Sep28.022138.19237@zip.eecs.umich.edu> <1990Sep30.233751.3244@zorch.SF-Bay.ORG> <1990Oct3.194556.7031@lth.se> <106878@convex.convex.com>
Reply-To: peterk@cbmger.UUCP (Peter Kittel GERMANY)
Organization: Commodore Bueromaschinen GmbH, West Germany
Lines: 17

In article <106878@convex.convex.com> swarren@convex.com (Steve Warren) writes:
>The solution to the bandwidth problem is banks.  We already have two
>seperate banks of chip mem in the 3000 with 2 Megs of chip.  The trick
>is to set it up so that as long as the video DMA is accessing one of the two
>banks, the CPU can have transparent access to the other bank simultaneously
>(ie no cycle-stealing necessary).  

Crap. (Sorry) But PLEASE understand that Chip RAM in an Amiga is not solely
used for video! There are many many other important data held there. Second
caveat is that you would lose the big advantage of arbitrarily placeable
bitmaps in memory, you would be forced to arrange them properly across
your banks. And what happens with our system or sound data during a bank
switch?

-- 
Best regards, Dr. Peter Kittel  // E-Mail to  \\  Only my personal opinions... 
Commodore Frankfurt, Germany  \X/ {uunet|pyramid|rutgers}!cbmvax!cbmger!peterk