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Article #2317Re: Bus contention
From: Curt Jutzi
Date: Thu, 30 Jan 1986 16:39
Date: Thu, 30 Jan 1986 16:39
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In article <2048@watdcsu.UUCP> dmcanzi@watdcsu.UUCP (David Canzi) writes: >To refresh a 640 by 400 bit screen 70 times per second from memory 16 >bits wide requires reading memory 1.12 million times per second. It >takes 4 clock cycles (minimum) for the processor to read a word from >memory. I would assume the same applies to the screen logic, *plus* >the time it takes to get control of the bus before reading, and >relinquish it after reading. With an 8 megahertz clock, the screen >must be slowing down the processor by at least a factor of 2. What's wrong with duel ported memory? Curt Jutzi tektronix!pogo!jutz
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 (Tek) 9/28/84 based on 9/17/84; site pogo.UUCP Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!burl!ulysses!bellcore!decvax!tektronix!orca!pogo!jutz From: jutz@pogo.UUCP (Curt Jutzi) Newsgroups: net.micro.atari Subject: Re: Bus contention Message-ID: <2365@pogo.UUCP> Date: Thu, 30-Jan-86 11:39:50 EST Article-I.D.: pogo.2365 Posted: Thu Jan 30 11:39:50 1986 Date-Received: Sat, 1-Feb-86 05:44:29 EST References: <2048@watdcsu.UUCP> Reply-To: jutz@pogo.UUCP (Curt Jutzi) Organization: Tektronix, Beaverton OR Lines: 13