[Coco] A couple of questions

[jdaggett at gate.net]

Arthur

That is a possibility. Power up reset routine and warm start will look 
for a "DK" loaded at $C000. If it does not read that, then it will 
consider the disk controller is missing.

several things cause that to happen. One being a defective or 
missing ROM. Another possibility is the 74LS273 is bad. 

james

On 4 Jun 2005 at 15:32, Arthur Flexser wrote:

Date sent:      	Sat, 4 Jun 2005 15:32:16 -0400 (EDT)
From:           	Arthur Flexser <flexser at fiu.edu>
To:             	CoCoList for Color Computer Enthusiasts 
<coco at maltedmedia.com>
Subject:        	Re: [Coco] A couple of questions
Send reply to:  	CoCoList for Color Computer Enthusiasts 
<coco at maltedmedia.com>
	<mailto:coco-
request at maltedmedia.com?subject=unsubscribe>
	<mailto:coco-
request at maltedmedia.com?subject=subscribe>

> Or maybe he bought a controller that has no ROM in it!
> 
> Art
> 
> On Sat, 4 Jun 2005, Mark Marlette wrote:
> 
> > At 09:46 AM 6/4/2005, you wrote:
> > 
> > Frank,
> > 
> > All you have to do is plug the controller in to the side of the
> > coco. No drives are need to see the DECB boot banner.
> > 
> > Sounds like you have a blown controller. I repair these flat rate
> > labor of $20 plus parts.
> > 
> > Mark
> > Cloud-9
> > 
> > 
> > >On Sat, Jun 04, 2005 at 07:09:42AM -0700, Robert Emery wrote:
> > > > >
> > > > > Finally I got a 502 floppy and controller in an Ebay auction
> > > > > and I can't access the drive. Before anyone starts someone was
> > > > > selling their coco3 gear and the description mentioned that
> > > > > the drive didn't work. I wanted the monitor!! I'm wondering if
> > > > > there's a way to tell if the problem is with the controller or
> > > > > drive and how I can tell. In any case ard either of them worth
> > > > > fixing. If so where?
> > > > >
> > > > > Frank
> > > >
> > > > Need more info Frank...
> > > > Does the CoCo report Disk Basic when you power it up with the
> > > > controller inserted? Does the drive spin or light up? Do you
> > > > have a meter to test the drive's power supply? The controller is
> > > > the important thing to get 
> > > working, and
> > > > definitely worth it.
> > >
> > >The coco boots the same with or without the controller plugged in.
> > >No sign of disk basic. Do I need to have the drives attached to the
> > >controller to boot into disk basic? I don't remember seeing any
> > >lights on the drives but I didn't look to close. I'll check the
> > >power supply when I get home.
> > >
> > >Frank
> > >
> > >--
> > >Coco mailing list
> > >Coco at maltedmedia.com
> > >http://five.pairlist.net/mailman/listinfo/coco
> > 
> > 
> > 
> > -- 
> > Coco mailing list
> > Coco at maltedmedia.com
> > http://five.pairlist.net/mailman/listinfo/coco
> > 
> 
> 
> -- 
> Coco mailing list
> Coco at maltedmedia.com
> http://five.pairlist.net/mailman/listinfo/coco