Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!samsung!munnari.oz.au!uniwa!andreww
From: andreww@uniwa.uwa.oz (Andrew John Williams)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: 2MB SIMM modules?
Message-ID: <1991Mar29.051225.4056@uniwa.uwa.oz>
Date: 29 Mar 91 05:12:25 GMT
References: <49217@nigel.ee.udel.edu>
Organization: University of Western Australia
Lines: 25

BYRNE@muppet.dnet.ge.com writes:

>Well, I think I am finally going to get a hard drive for my A500 (If it clears
>with the wife :-).  I've decided on the GVP Series II A500-HD+.  It says it can
>handle 8 MB of RAM expansion using the provided 4 SIMM sockets. Amiga World had
>an article saying you can upgrade in multiples of 2 MB which suggests the slots
>take 2 MB SIMMs.  The question I have is do 2 MB SIMMs exist?  I've only heard
>of 1 MB and 4 MB SIMMs.  Also, any article in Amiga World implied that a full 8
>MB expansion only cost them $269!?!  Thanks...
No - it does not imply 2MB SIMMs. The 68k has a 16 bit data bus, so you
need multiples of 2 SIMMS to keep it happy. So:
2MB  =  2*1MB SIMMs
4MB  =  4*1MB SIMMs
6MB  =  err, umm
8MB  =  2*4MB SIMMs
it could continue
10MB =  2*4MB, 2*1MB
16MB =  4*4MB

but the 68k can only access 16MB, and some (I'd guess 1/2) of the space
would be allocated for other things (like ROM, I/O). Does this beast
actually do 6MB? If so, does anyone know how they fit it into 4 slots?

John West (stealing Andrew's account)
Once upon a time there was a fish