18 Oct
2008
18 Oct
'08
10:29 p.m.
On Friday 17 October 2008 12:21, Dave McGuire wrote:
On Oct 17, 2008, at 10:15 AM, Granz wrote:
I don't think that's what he was talking about there. I remember some S-100
cards coming with regulators (all of them did, early on), and later the
input and output points where those regulators _had been_ were connected with
a wire jumper in the assumption that a switching power supply of some sort
with regulated outputs would be used instead of the original S-100
unregulated supply.
The catch, though, is that the System 3 needs a +24V supply as well, for
the FDD. I have one, and it uses an oddball connector, too, which is one
of the reasons I haven't gotten around to fixing the drive yet (which has
problems), I need to make an extension power cable for the drive so it can
be powered up and out in front of the case.
(Snip)
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
I have most of the stuff to put together a System
3. I have the
card cage with the 21-slot motherboard and a bunch of cards. The
manuals I got with the system include the Cromix manual, I have
more than 1 64-K RAM card and at least one TPU, so I believe that
mine was a multi-user system. I would like to put this back to
near-original, but need a case and power supply.
Since I have been unable to find any power supplies which provide
the +/- 8 and +/- 16 volts, I just thought of an idea the other day
of using a PC power supply and shorting out the on-board voltage
regulators to allow them to work at the +5V and +12V of the power
supply. In order to do that though, I would need a small (3-5
slot) motherboard to test a couple of cards together.
I don't think it's going to be possible to short around the +5 and
+12 regulators in a PC power supply, as they're not discrete in that
way.