[Coco] ATX to CoCo3 conversion

[David Ladd]

The one system is a existing 8088 XT case that his CoCo3 is already in.

On my system I never finished converting. I am currently have the
Coco3 in a mid tower case with (3) 5.25" drive bays and (2) 3.5"
external bays and 1 internal.

As far as the +12V and -12V for the RS232 I do plan on using it for drivewire.

Installing fuses shouldn't be a problem.  I could use the same type of
quick blow fuses that is used on PC motherboards to protect the PS/2
keyboard port.  I believe those are 2A rating.

Thank you to everyone for their input on this updated project.

On Tue, Sep 25, 2012 at 10:31 AM, Frank Swygert <farna at att.net> wrote:
> Details for connecting an AT or other PS to a CoCo are in "Tandy's Little
> Wonder". The CoCo2 and 3 only need +5V and a little +12V and -12V for RS-232
> operation. If you don't use the bit-banger you can get by with just a 5V PS
> in the 2 and 3 -- +/112V is needed for RS-232 traffic.
>
> A CoCo with a pair of floppy drives (including the power the drives pull)
> only requires a total of about 30W, so can be run from the same PS. A newer
> model HD only pulls a few more watts -- a 60-65W PS would be all that's
> needed. I wouldn't use a PC type PS unless mounting the system in a PC type
> case. There are a number of surplus electronics places that have smallish
> (40-150W) power supplies that would work. Try Alltronics and Weirdstuff.
>
> A mini-tower 80-150W PS would be suitable. Make a box for the PS and run
> wires to the drives and CoCo, or better make a box to hold the PS and drives
> then run power from that to the CoCo. A mini ITX case could be modified into
> a drive case and comes with a 80W or so PS. It's hard to find old drive
> enclosure cases! CD-ROM enclosures work, you may be able to find one for 2-4
> CD-ROMs at a reasonable price that has a PS.
>
>
> =====================================
> Date: Tue, 25 Sep 2012 00:32:17 -0500
> From: David Ladd<drencor at gamepixel.net>
>
>
> I am not sure if anyone has tried to work out a circuit that would
> allow us to use a ATX power supply to power a CoCo3's motherboard and
> other devices in a PC case conversion.
>
> Back in the good old days I had gotten the document off of Delphi for
> the AT PS to CoCo3 conversion.  Though these days getting harder to
> find places that sell new AT PS.
>
>
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