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From: pc@unisoft.UUCP (Paul Campbell)
Newsgroups: net.micro.mac
Subject: Monster Macs
Message-ID: <446@unisoft.UUCP>
Date: Fri, 19-Apr-85 11:27:31 EST
Article-I.D.: unisoft.446
Posted: Fri Apr 19 11:27:31 1985
Date-Received: Sun, 21-Apr-85 06:11:01 EST
Distribution: net
Organization: UniSoft Systems, Berkeley
Lines: 31

<munch>
	Just an update on how my >512K mac is coming on.
I have finally been able to get all the bits I need together in the same
room ... and I finally started last weekend. I now have a 1Mb mac ...
but its second set of memory is a little forgetfull at the moment, nothing
some more decoupling wont fix. The mods are very simple, only the ram
chips and 3 other commonly available chips (plus a few resistors and lots of
capacitors). I put mine on a daughter board with lots of wires ... it doesn't
look pretty, if you only want an extra 512K you could piggy-back the ram chips,
this would make things much tidyer, but limit your future growth. At the moment
my circuitry will expand easily to 2Mb, and once I figure out which pin on the
VIA changes the memory mapping at boot time, it will go to 4Mb (probably I
will need another chip :-( also I want to add some form of memory protection
so that I can stop programs in a development environment from walking all
over my ramdisks. I will be making a 2Mb board (once I figure out where to
get the PC artwork tools ... Bishop Graphics or like ... any-one got any ideas
in or near Berkeley/SF?). Once I have a stable system I will be publishing
the circuit diagrams, building instructions in net.sources.mac, hopefully
next week. 

		More to come ... soon

		Paul  Campbell		..!ucbvax!unisoft!paul

			"Let`s do the Mac ...."


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(except hopefully my paycheck at the end of the week :-)