5 Jun
2005
5 Jun
'05
12:39 p.m.
From: "Richard A. Cini" <rcini at optonline.net>
Sent: Sunday, June 05, 2005 2:25 PM
Interestingly, in this unit, the front panel power
switch is not used.
There is a jumper on the PC board which bridges the connector for the
switch. A new power switch was inserted in the back panel and wired
directly in the line.
About the UL listing, I thought it interesting how exposed line voltage
was. It's very easy to touch line voltage if you're not careful.
Rich
In the 70's it was assumed that you knew what you were doing today a device
that is designed to be user serviceable with open line voltages would never
pass muster.
Imsai built to a high standard but they assumed they customer had basic
understanding of electricity.
Recently there was a power blackout where I live. I started up my gas
generator (5500 watts) and used high quality extension cords to hook up the
TV, satellite reciever, and refidgerator, and some lights. My neighbor had
a tiny generator (800 watts) he knew nothing about. I helped him get his
going and told him to get a good extension cord, I plugged it in and handed
him the other end and told him to use that for power. He pointed out that
the cord had a female socket and asked how to plug it into the house wiring
to power the whole house :)
Randy
-----Original Message-----
From: cctalk-bounces at classiccmp.org
[mailto:cctalk-bounces at classiccmp.org] On Behalf Of Randy McLaughlin
Sent: Sunday, June 05, 2005 1:07 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: S100 address buss troubleshooting
From: <shoppa_classiccmp at trailing-edge.com>
Sent: Sunday, June 05, 2005 11:49 AM
Be
careful after turning off the computer and don't pull the cards
until you are sure the voltage levels have dropped
For that matter, if yours has a power switch on the front panel, be
careful what you touch in the vicinity of that switch, even after
you've turned it off!
The rightmost switch was truly a "user wires it how he wants" switch,
and when you bought an IMSAI it came with artwork to let you make a
transparency layer that matched the function you chose. (Which is why I find these arguments about keeping original
front panel
transparencies so amusing.)
Tim.
All of the S100 systems I've dealt with have had the line power exposed
somewhere, none would ever pass UL testing.
Randy
www.s100-manuals.com