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From: philip@Pescadero.Stanford.EDU (Philip Machanick)
Newsgroups: comp.sys.mac.hardware,comp.sys.mac.system
Subject: Re: Remember the HD20?  How do I use it?
Message-ID: <1990Jun12.205520.21620@Neon.Stanford.EDU>
Date: 12 Jun 90 20:55:20 GMT
References: <1990Jun12.130417.4698@watdragon.waterloo.edu>
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In article <1990Jun12.130417.4698@watdragon.waterloo.edu>,
bwbecker@watdragon.waterloo.edu (Byron Weber Becker) writes:
> I've picked up an old HD20 -- a pre-SCSI hard disk -- for
> a friend's 512K Mac.  I've got the HD20 init.  Questions:
> 
> 0. Is it as simple as connecting the HD20 to the floppy
>    port and putting the init in the system folder?
No. if the Mac is an original 512K machine, it can't boot off the
HD20. You need to boot off a 400K diskette with the init. If it
has the Mac Plus ROMs (512KE), it can use the HD20 directly, and doesn't
need the init at all.
> 1. Can the Mac be booted off the HD20?
Yes, but only if you have the MacPlus ROMs.
> 2. What's the latest system/finder that can be used?
Someone else will have to answer this.
> 3. Can the HD20 have a HFS, or does it need to be the old
>    flat file scheme?
The HD20 formats as HFS by default (I don't know how to format it as MFS).
> 4. If it must be a flat file, what techniques can be used
>    to keep data organized?
See 3.
> 5. What is the latest system that can be used with a Mac
>    512K (400K disk drives) WITHOUT the HD20?
I don't know again - but if the machine has 400K drives, it won't have
the Plus ROMs. Incidentally, the HD20 init also implements HFS, so
using it makes it possible to use an external 800K drive (i.e., it is
useful even if you don't have an HD20). However, if you are going to
spend any money on hardware, rather spend it on Macplus ROMs plus
internal 800K drive (the minimum upgrade Apple will sell you).

Philip Machanick
philip@pescadero.stanford.edu