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From: Loopy@cup.portal.com (Justin Randall Padawer)
Newsgroups: comp.sys.mac.hardware
Subject: Re: How to upgrade a Mac 512K for more ram and 800K drive?
Message-ID: <35687@cup.portal.com>
Date: 7 Nov 90 03:42:20 GMT
References: <1990Nov6.080233.19912@ucselx.sdsu.edu>
  <19196@oolong.la.locus.com>
Distribution: na
Organization: The Portal System (TM)
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David, Including the old HD20 driver, from Apple, in the system folder will
allow a 512K, with 400K internal, to drive an 800K external in HFS mode.  I
ran the same set-up for several years.  This greatly adds to the function
of the 512K.  This is the driver that shipped with the non-SCSI Apple 
20-meg hard drive.  It is simply a ROM patch that allows for the HFS to be 
read.  Your Apple dealer should be willing to provide this free of charge.
If your dealer can not locate this driver, Email me.  I still have a copy of
the original disk that came with my 800K external.
Hope this helps, Paul Hopkins
Loopy@cup.portal.com