Path: utzoo!attcan!uunet!husc6!ukma!mailrus!ulowell!masscomp!ftw
From: ftw@masscomp.UUCP (Farrell Woods)
Newsgroups: comp.sys.atari.st
Subject: Re: Request info: 1040 RAM upgrades
Message-ID: <241@masscomp.UUCP>
Date: 3 Jan 89 19:02:07 GMT
References: <480013@hpdml93.HP.COM> <527@stag.math.lsa.umich.edu> <1304@accelerator.eng.ohio-state.edu>
Reply-To: ftw@quasar.UUCP (Farrell Woods)
Organization: MASSCOMP - Westford, Ma
Lines: 28

In article <1304@accelerator.eng.ohio-state.edu> DAVISM@kcgl1.eng.ohio-state.edu (Michael T. Davis) writes:
>[blah!]
>
>	I am a bit confused over the "2.5 megabyte" specification.  To
>paraphrase Howard Chu, he writes that he installed a memory expansion
>board with 2 megs on-board into a 1040.  How does this yield 2.5 megs?
>
>							Thanks,
>							 Mike
>
To install the Tech Specialities RAM upgrade, you must disable some or all
of the existing RAM in the 1040.  The memory glue chip can only deal with
four banks of RAM, and the 1040 uses four banks of 256K-bit chips.

I disabled two banks, leaving 512K of the original memory, and added
two banks of 1 M-bit chips on the Tech board, giving 2.5M.  Incidentally,
I had access to professional desoldering stations to help me remove the
two banks of RAM.  I would not do this again.  It is *really* difficult
to do without damaging the motherboard.  I do not have the clock option
on this board, and it has been running fine for over one year.



-- 
Farrell T. Woods				Voice: (508) 692-6200 x2471
MASSCOMP Operating Systems Group		Internet: ftw@masscomp.com
1 Technology Way				uucp: {backbones}!masscomp!ftw
Westford, MA 01886				OS/2: Half an operating system