Though it's not consistent with my own bent, the "new" IMSAI offers a "safe" place in which to play with those extremely costly boards some folks have picked up from the eBay auctions. 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 had on-board regulation, so that if you didn't need a given supply, you didn't have to bring it on board and regulate it, dissipating power as you went. If the new box is capable of running the original boards, it must provide the raw 8 and +/- 16-volt supplies. Where's the benefit in having a switching regulator sitting in the back of the box? I suppose it creates a market for a power distribution module to put +5 and +/- 12 on each board which needs it rather than using the on-board regulators, but that opens another can of worms. What's the "right" way to distribute it without tampering with a historically correct board? Dick -----Original Message----- From: allisonp(a)world.std.com <allisonp(a)world.std.com> To: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> Date: Tuesday, August 17, 1999 1:44 PM Subject: Re: imsai 2 T11. pretty