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From: jacc@midas.UUCP (Jac Colby)
Newsgroups: comp.sys.amiga
Subject: Re: Cheap ram expansion mods
Message-ID: <1019@midas.UUCP>
Date: Sun, 18-Jan-87 12:39:43 EST
Article-I.D.: midas.1019
Posted: Sun Jan 18 12:39:43 1987
Date-Received: Mon, 19-Jan-87 04:14:33 EST
References: <5206@amdahl.UUCP>
Reply-To: jacc@midas.UUCP (Jac Colby)
Organization: Tektronix, Inc., Beaverton, OR.
Lines: 44
Keywords: hardware ram expansion modifications
Summary: Compatibility with Kickstart Elim & RAM Expand Kit

In article <5206@amdahl.UUCP> kim@amdahl.UUCP (Kim DeVaughn) writes:
>
>[ "Send lawyers, guns, and money ..." ]
>
>The new issue of Amazing Computing (v2,n1) has a very detailed article (by
>Cris Erving) about how to add 512K of memory to the Amiga's motherboard.
 ...
>Also, I'm wondering if this mod can be made compatible with the "Kickstart
>Eliminator and RAM Expansion Kit" by Creative Microsystems, Inc. that
>Jac Colby talked about in a recent posting.  This mod wants to live at
>x'080000' thru x'0FFFFF', immediately above Chip ram.  [Jac ... where does
>the WCS end up living after installing the Kit?  Can it be moved elsewhere?]

After taking a look at the Amiga's memory map, it would seem that the
two memory enhancements should be able to cohabitate very nicely.
The Kickstart Eliminator and RAM Expansion Kit AddMem's the WCS RAM
from  x'0F80000 to x'0FBFFFF.  The Amiga H/W manual shows the system
ROM space to be x'0F80000 to x'0FFFFFF, with the notes: "Development
system ROMs located at start address x'0FE0000" and "Final system ROM's
will probably be located at start address x'0FC0000".  So I assume that
the WCS was and still is mapped to x'0F80000 to x'0FBFFFF, and the new
ROM's now occupy all of x'0FC0000 to x'0FFFFFF.

Now, let's see, if you used 1 meg RAM's in the x'080000 space (even less
power draw), and a full 8 meg expansion board, you'd could get 10.75 meg
 ... but be careful, you might run afoul of the law of diminishing
returns.

BTW, I'm still very happy with the Kickstart Eliminator and RAM Expansion.
I'll be getting the RAM speed benchmark program later today and will
report the WCS speed as soon as I can.

Jac Colby	- they disclaim me around here, too.
UUCP: {ucbvax,decvax,pur-ee,cbosg,ihnss}!tektronix!midas!jacc
-or-  jacc@midas.TEK.COM
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-or-  MS 94-442, PO Box 4600, Beaverton, OR, 97076 (503) 629-1129

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