[sebhc] list archive and a specific question

[Barry Watzman]

On the WD support chips, although I hate to suggest this, if a Z-100
controller becomes available (or even, for that matter, an entire Z-100), it
has those same chips, socketed, and you could pull them to build up the
89-37.  It's been possible to pick up Z-100 FDC boards cheaply (under $10)
at times.

I don't remember the H-8 8" board, I'm not even certain that there was one
from Heath.  The H-8 had only a 2MHz 8080, which could not do double density
8".  [I have the catalogs from that era, but they are boxed up in the
basement and are not handy].

Barry


-----Original Message-----
From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of
Lee Hart
Sent: Wednesday, July 06, 2005 1:48 PM
To: sebhc at sebhc.org
Subject: Re: [sebhc] list archive and a specific question

Barry Watzman wrote:
> 
> There was an H8 disk controller (H17 type) on E-Bay, the auction ended
last
> night (Tues. night).

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.

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. There
are alternate circuits, but they take more PC board space. Does anyone
have a schematic and layout for the H8 H37 board?
-- 
If you would not be forgotten
When your body's dead and rotten
Then write of great deeds worth the reading
Or do the great deeds worth repeating
	-- Ben Franklin, Poor Richard's Almanac
--
Lee A. Hart, 814 8th Ave N, Sartell MN 56377, leeahart_at_earthlink.net

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