> SOME of the later S100 systems had regulated supplies and then ditched the > board regulators, > usually leaving a place to put a regulator with just a jumper wire in place > of the regulator.
Sure. But in this machine I can see some heatsinks on the S100 boards that are likely to be used for regulators. Of course they might have been bypassed and the boards used on a regulated supply. Incidentally, I found the 380Z service manual on the web (vt100.net I think). It gives a schematic of the power supply (it's pretty much what you'd expect), this is the later supply in the black-cased machines. I am still looking for several pieces of 380Z related infiormation : A listing of the COS ROM V3.4 (there is older version on that site which is a good start, though). Any information on the SIO-2 interface (bit-banged serial over the user port), other than the installation instrucitons. Any real information on the dual cassette control unit. -tony
