imsai 2

From: Allison J Parent <allisonp_at_world.std.com>
Date: Tue Aug 17 19:57:18 1999

<What puzzles me is why the IMSAI folks decided to use a switching power
<supply when the box and everything else already supported the needs of the
<S-100 with the previously available and now quite inexpensive unregulated
<supplies of yesteryear. One of the main benefits of the S-100 was that it

It would hae to be regulates at Vreg(oncard)+3V to work. or every cards
would ahve to have the regulators ripped off. Add to that +5V bus sag
from end to end... not a good thing. This is why most every other "decent"
bus (STD, Multibus, Eurocard, Qbus, unibus...) were either physically short
or used multiple supplies powering short segments.

On a more serious vein, cost, availability and oh UL/CSA/TUV/<your favorite
 safety/electrical/communications standards agency here>.

I should look at this hack to see how much damage there is... likely the
idiots have a PC inside wiggling the lights and thats all.

Allison
Received on Tue Aug 17 1999 - 19:57:18 BST