[sebhc] list archive and a specific question

Barry Watzman Watzman at neo.rr.com
Wed Jul 6 14:01:51 CDT 2005

The 67 interface was very slightly modified Sasi.  The sasi interface, 50
pins, had 10 contiguous unused (or extra ground) lines, and they were simply
omitted to reduce the width of the cable.  But on the controller itself
(inside the 67 box), it still had the full 50-pin interface.

-----Original Message-----
From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of
Dan Lanciani
Sent: Wednesday, July 06, 2005 2:41 PM
To: sebhc at sebhc.org
Subject: Re: [sebhc] list archive and a specific question

|I also have an H8 with no disk controller. The board I'd like to find
|for it is the H37/H47 controller. I'm even willing to build one myself
|if I can find enough documentation.

Do you mean the H37/H67 controller?  The H47 controller for the H8 is
a separate board, and the one disk controller I don't have (though I
have the H89 version).  I dumped the H47 drives--far too destructive
of disks... :(

|I have built H37 controllers for the H89. In fact, I'm trying to do so
|now. I have PC boards, almost all the parts, and have one almost
|finished. If I can only find a source of Western Digital WD2143M-03 and
|WD1691PE chips I should be in business.
|The H8 board, being larger, may not have used these rare chips.

I'm afraid it does.  Somewhere I may actually have one or two of the
floppy support chips.  You might get away without using the multi-phase
clock generator at all.  Wasn't precomp disabled by default anyway even
for 80 track drives?

|are alternate circuits, but they take more PC board space. Does anyone
|have a schematic and layout for the H8 H37 board?

I have the whole manual.  As a side note I made the obvious adapter cable
from the H67 port to 50 pins and it talks to SASI devices just fine, though
I never got the partition table right.

				Dan Lanciani
				ddl at danlan.*com
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