5456Re: WTD: Morrow Wunderbuss Thinker Toys Motherboard Schematic/docs
- May 8 10:29 AMBill Degan posted here a request for zener diode information for a
Morrow Wunderbus card; he said I did not have that manual listed. Bill
also sent me a request privately.
In fact, I DO have that manual listed on my site, and I replied to
Bill with some zener information. Meanwhile Dan replied here at MARCH:
Dan <ragooman@...> wrote:
> I almost posted a lengthly explanation on the march group list before I
> noticed you posted the pic on cctech. The power supply in that circuit
> is a -12V not +12V. The voltage regulator part # on there is a 7912
> which outputs -12V. The part that is blown on there is an electrolytic
> cap, not a zener (note the + sign on each end of the cap). Both of
> parts below the 7912 are the same type of part...among other comments.
This is why I don't do diagnosis of S-100 problems by email. There IS
a zener diode on the Wunderbus, and I conveyed to Bill the information
about it, and offered a manual to him. As for the picture, I've not
seen it, so I have no idea what the actual problem is. I don't follow
cctech simply because I can't keep up with traffic. I can't really
keep up with it here "in" MARCH for that matter.
For those who don't know: I have a very very large collection of S-100
manuals, from which I offer good photocopies for a modest fee per
page. Yes, there are free PDF's on the Web: my customers tell me that
my copies are superior, and I have manuals not otherwise available.
The fees I charge allow me to continue this service, year after year.
Oh, and the title at that home page advises "I let the MANUALS do the
talking". Most S-100 manuals provide schematics, circuit and
programming descriptions at length: some include source code listings.
Herbert R. Johnson, New Jersey USA
<a href="http://www.retrotechnology.com/herbs_stuff/"> web site</a>
<a href="http://www.retrotechnology.net/herbs_stuff/"> domain mirror</a>
my email address: hjohnson AAT retrotechnology DOTT com
if no reply, try in a few days: herbjohnson ATT comcast DOTT net
"Herb's Stuff": old Mac, SGI, 8-inch floppy drives
S-100 IMSAI Altair computers, docs, by "Dr. S-100"
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