Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!wuarchive!emory!att!cbnewse!gmark From: gmark@cbnewse.att.com (gilbert.m.stewart) Newsgroups: comp.sys.m6809 Subject: Re: COCO upgrade Summary: Yeah. Message-ID: <1991Feb5.162551.13619@cbnewse.att.com> Date: 5 Feb 91 16:25:51 GMT References: <535@ctycal.UUCP> Distribution: na Organization: AT&T Bell Laboratories Lines: 27 In article <535@ctycal.UUCP>, ingoldsb@ctycal.UUCP (Terry Ingoldsby) writes: > In article , rh2y+@andrew.cmu.edu (Russell E. Hoffman, II) writes: > > Gilbert M. Sterart writes: > ... > > >[paraphrased] .. I have a CoCo I, I wanna replace it with a CoCo III, > > > what can I keep / what can I throw away... > ... > > Well, you are pretty much in luck.. > > You can re-use the disk controller and drives. If you have the VERY old style > > disk controller (v1.0 ROM instead of v1.1), you may have a small problem, > > If you have a very old controller, it may require -12 v (and maybe +12v, I > can't remember). It may also balk at running at 1.8 MHz, although this > is not likely. I just added +/- 12 v supplies to my CoCo III and everything > is happy. You can fit something inside the case without too much trouble. Man, this is so cool, getting so much information from folks! Thanks in spades! Anyway, yeah, that's what I was getting to in a previous posting. Would the lack of the extra voltages prevent the DISK BASIC display from coming on at power-up? Like, is the BASIC ROM in the controll powered by 5V and various drive control circuitry powered by 12? Bottom line, will my drives work. They don't seem to be finding anything on the disks. I get nothing from DIR, but the drive motor is activated. Just doesn't deliver anything to the COCO, and times out. As ever, TIA. GMS