Newsgroups: comp.sys.tandy
Path: utzoo!lsuc!jimomura
From: jimomura@lsuc.on.ca (Jim Omura)
Subject: Re: Color Computer 1/2 + Disk Drive
Organization: Consultant, Toronto
Distribution: usa
Date: Wed, 22 May 1991 01:34:25 GMT
Message-ID: <1991May22.013425.22104@lsuc.on.ca>
References: <2819@lee.SEAS.UCLA.EDU>

In article <2819@lee.SEAS.UCLA.EDU> cccph@jessica.cs.ucla.edu (Charles Hobbs) writes:
>
>
>I have two 16K Color Computers, a Coco 1, and a Coco 2. Initially, the
>Coco 1 had Extended Basic, the Coco 2 did not. I also have the
>Color Disk Controller, and one disk drive.
>
>For a while, I was using the disk drive with the Coco 1. But, I wanted
>to take advantage of the nicer keyboard on the Coco 2. Since the
>Disk Controller requires Extended Basic to operate, I pulled the
>Extended Basic ROM from the Coco 1 and put it in the Coco 2.
>
>The Extended Basic works fine in the Coco 2. When I plugged the
>Disk Controller into the Coco 2, with Extended Basic, the system
>boots up into Disk Extended Basic, but the disk doesn't operate
>at all. (I've checked the cable, and it's installed properly.)
>DIR, FREE(0), DSKINI 0....all that happens is the disk will spin
>for a while....and then ?IO ERROR.
>
>Ok, is there something in the Coco 2 that I am forgetting about?
>Thanks in advance....

     The original CoCo supplied both 5 volts and 12 volts to the
controller.  The CoCo2 only supplies the 5 volt line.  You'll either
have to change controllers to a newer version or add the 12 volt
line(s).  I don't have my manuals handy but it's clearly set out
in the buss definition where you have to add the 12 volts.  Actually,
you could probably pick up a 2nd hand controller cheap if you can
find someone who moved up to the no-HALT type disk controllers.


     Say, I noticed you seem to have a Spectravideo.  I wish I
had one of those again.  They were really nice.  I still have
a Yamaha CX-5MII (MSX) computer, among other things.
-- 
Jim Omura, 2A King George's Drive, Toronto, (416) 652-3880
lsuc!jimomura
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