Re: RAM mod question for James McPhail

From: James MacPhail <uo957_at_email.domain.hidden>
Date: Sun, 22 Jan 2006 15:04:18 -0800

>Ever since I read what you wrote about the 'LRamBo' 2 meg mod for the
>apple lisa 512k card I've been intrigued, and the 4 meg mod for
>Macworks Plus II.
>Where would I find information on doing these mods? I've searched the
>internet using google, and found nothing.

Hi Phil,

At the moment, I can't find a good site offering both of these either. It appears that some of the more extensive Lisa information sites are offline, or perhaps have been dropped from Google's index.

  1. I did find the instruction sheet for the 2 MB mod in two places. Note that the contact info on the sheet is out of date (phone number and CompuServe address).
    1. Go to this page and scroll the right hand list to ram512-1 through -3.


2. This site does not include pages 1 and 2, which were reverse engineered schematics of the 512K memory board. Since Apple schematics of the RAM board are available online (at the same site, for instance), I don't think this is a problem and page 3 is really all you need.


b) I am happy to email the 4 MB modification to those who ask, please let me know if you would prefer the format to be: MacDraw (the original document), generic PICT, or Acrobat PDF. To avoid annoying the other list members, please send your email to me directly rather than replying to this posting.

The 4 MB modification instructions do not include information for using the Sun Remarketing memory board (which has SIMM sockets). I suspect that J1 on that board is to support the 4 MB modification, but I have not tested it.

To be clear, the 4 MB modification only works with a few operating environments, such as MacWorks Plus II. It also works with MacWorks Plus 1.1h, and if the memory is restricted to 3.875 MB, with MacWorks Plus 1.0.18.

HTH, James

James MacPhail                   "Think not of engineering as art,
uo957_at_email.domain.hidden                 but of art as engineering"
Sigma Seven Systems Ltd.
james_at_email.domain.hidden        <>

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Received on 2006-01-22 15:05:11

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