Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!hplabs!hpfcso!hplisa!hpislx!bfc
From: bfc@hpislx.HP.COM (Bryan Carpenter)
Newsgroups: comp.sys.mac.hardware
Subject: Hacking a 128k Mac into a Mac+
Message-ID: <3370001@hpislx.HP.COM>
Date: 11 Jan 90 19:26:03 GMT
Organization: Measurement Systems Operation - Loveland, CO
Lines: 21


I have an original Mac that started its life as a 128k.  I did the Dr. Dobbs
upgrade to 512k, then the 512e upgrade to get 128k ROMs and 800k drive.
I then upgraded the RAM again by piggybacking another 16 256k RAMS on top
of the original 16.  I added a Supermac SCSI adapter to connect a hard drive.

As far as I know, I now have a Mac+ equivalent except for one thing.  I still
have the original battery-backed parameter RAM, and from what I've heard,
The Mac+ went to one with more capacity.  Does anyone know whether there's
any way to obtain a Mac+ equivalent parameter RAM that I could substitute in
or whether there's some way to add a circuit to emulate the larger RAM?

I am currently contemplating adding more RAM to my machine so I can keep up
with the memory requirements of modern Mac software and system 7, but I have
this nagging feeling that the parameter RAM issue is going to bite me one of
these days.

Thanks in advance for any help.

Bryan Carpenter
bfc%hpislx@hplabs.hp.com