Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!munnari.oz.au!goanna!minyos.xx.rmit.oz.au!s902113
From: s902113@minyos.xx.rmit.oz.au (Luke Mewburn)
Newsgroups: comp.sys.amiga.misc
Subject: Re: "How to move Harddiskdevicedrivers SLOW>FAST"
Keywords: my mother watched television
Message-ID: <1991May30.033721.19131@minyos.xx.rmit.oz.au>
Date: 30 May 91 03:37:21 GMT
References: <1991May26.150242.21983@daimi.aau.dk> <19277@bunker.isc-br.com>
Organization: RMIT Computer Centre, Melbourne Australia.
Lines: 34

jerrys@bunker.isc-br.com (Jerry Shea) writes:

>Slow RAM is RAM on the motherboard that is not being used as Chip RAM. At
>first you had 512k chip / 512k slow RAM. When you upgraded to 1M chip RAM,
>you no longer had any slow RAM since all of the motherboard memory was
>being used as chip RAM. The RAM in your expansion card is fast RAM.

>Jerry

>P.S. - Sorry if the above is a little confusing. Maybe someone else can
>explain it better.

Maybe like this:
	Chip RAM: RAM that can be used by custom chips as well as CPU
	Slow RAM: RAM that can't be used by custom chips, but is as slow as
			  chip ram.
	Fast RAM: RAM only accessable by CPU.

  Anyway, slow RAM occurs when you have an Agnus which can access 1MB chip,
but is shipped with 0.5Mb. (ie. A500r6 or above), (eg. 8372 agnus in
A500r6A) but have an A501 expansion. The extra 0.5MB is slow ram 'cause
it can't be accessed as chip ram w/o hardware mods.


>-- 
>Jerry Shea                            |  INET:  jerrys@bunker.shel.isc-br.com
>ISC-Bunker Ramo, An Olivetti Company  |  UUCP:  uunet!bunker!jerrys
>2 Enterprise Drive                    |  BIX:   jshea
>Shelton, CT 06484 USA                 |  Phone: (203) 337-1646
-- 
____________________________________________________________________________
|                                     |                                    |
| Luke Mewburn   (Zak)                |      This side for lease...        |
| s902113@minyos.xx.rmit.oz.au        | (No disclaimer, can't afford it:-) |