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From: dlm@iheds.UUCP (Daryl Monge)
Newsgroups: net.micro.atari
Subject: Re: Bus contention
Message-ID: <485@iheds.UUCP>
Date: Tue, 28-Jan-86 21:07:05 EST
Article-I.D.: iheds.485
Posted: Tue Jan 28 21:07:05 1986
Date-Received: Thu, 30-Jan-86 01:28:33 EST
References: <2048@watdcsu.UUCP>
Organization: AT&T Bell Laboratories
Lines: 14

> 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.

Yes, and that is merely 892 ns cycle time.  The memory according to BYTE
is 125 ns cycle time.  Plenty of spare time.  Controller chips and other
interesting things keep the CPU from occupying the memory for more than
one cycle.


Daryl Monge
AT&T
Bell Labs, Naperville, Ill

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