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From: alfter@nevada.edu (SCOTT ALFTER)
Newsgroups: comp.sys.apple2
Subject: Re: speed loss
Message-ID: <1991Apr23.170359.19679@nevada.edu>
Date: 23 Apr 91 17:03:59 GMT
References: <9104181535.AA28525@apple.com> <1991Apr20.080839.27678@ux1.cso.uiuc.edu>
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In article <1991Apr20.080839.27678@ux1.cso.uiuc.edu> stuckey@ux1.cso.uiuc.edu (Anthony J. Stuckey) writes:
>this.  One thing that I have noticed is that there are _many_ utilities
>for DOS machines to allow you to lengthen the period before refresh (the
>manufacturer's specifications are somewhat conservative)  but I have never
>seen such a thing for _any_ other machine.  (mac, amiga, II, whatever)

I can't speak for other systems, but the Apple II has no need for
these utilities since processor time isn't eaten up for memory
refresh.  Refresh is handled by the video circuitry; processor and
video accesses to RAM are interleaved.  There is no way the 65(C)02 in
an Apple II can access memory at the same time it's being refreshed.

(This is what I can figure out from the IIe tech reference.  Older IIs
may have been designed differently.  The IIGS was probably designed
differently as well; I think someone said that GSes take a speed hit
when you plug in hella memory.)

Scott Alfter-----------------------------_/_----------------------------
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