DIY SCSI... It's done!

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Article #19140

#19140

From: Hedley Rainnie
Date: Tue, 15 Sep 1987 17:01

18 lines
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A few months ago there was a flurry of talk about this.
Well I successfully built a 20MB HD system for a 512Ke mac. Rather
than paying $90 for a SCSI clip on I built my own with 2 chips
a PAL and the NCR5380 (act. AMD) The controller I got was the 
Adaptec 4000A and the drive a Seagate ST225. The software was 
provided by Ephriam Vishniac and rather than donate blood I am sending
him $10. Everything seems to work except the disk must be mounted via
floppy rather than auto booting, I have the old 128K ROMS's, Does anyone
know what 30bytes were changed in the ROM to correct the booting problem?
It would be nice to be able to boot directly and unlike a system update
it it much harder to get a ROM update.

I will write all my efforts up if there is interest, i.e. pictures doc
etc...

Cheers, Hedley
{decwrl|sun}!imagen!hedley

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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: arc1-ca.pugleaf.net!utzoo!mnetor!uunet!husc6!think!ames!aurora!labrea!decwrl!sun!imagen!hedley
From: hedley@imagen.UUCP (Hedley Rainnie)
Newsgroups: comp.sys.mac
Subject: DIY SCSI... It's done!
Message-ID: <1479@imagen.UUCP>
Date: Tue, 15-Sep-87 13:01:03 EDT
Article-I.D.: imagen.1479
Posted: Tue Sep 15 13:01:03 1987
Date-Received: Fri, 18-Sep-87 04:26:30 EDT
Organization: Imagen Corp., Santa Clara CA
Lines: 17
Keywords: finished relief mucho MB