[Coco] Drive controller problem

[Brian Blake]

If you look back to January of 2010 in the Maltedmedia archives, I had a 
problem with a CoCo3 and and FD-502 controller as well. Also, there's a 
section on my blog about the process of tracking down the problem: 
http://tandycoco.com/blog/archives/40

The CoCo3 would work as expected with other cartridges plugged in, but, 
I could get NO activity from a floppy disk set up - at all.

Gene, Mike and a few others pitched in to help me find the problem; 
which in my case, this turned out to be IC9 - an LS138N - that was bad. 
Replaced it and the CoCo has been running great since. While not exactly 
the same symptoms, your problem might have the same cause.


Brian


On 4/3/2014 7:04 PM, Bill wrote:
> This is one mystery that may never be solved. In taking out the chip and
> replacing it, one of the legs bent so bad that it'll break if I do it again.
>
> -----Original Message-----
> From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] On
> Behalf Of Arthur Flexser
> Sent: Thursday, April 03, 2014 6:59 PM
> To: CoCoList for Color Computer Enthusiasts
> Subject: Re: [Coco] Drive controller problem
>
> This is a CoCo 3, right?  Try going to ROM mode with a POKE&HFFDE,0, just on
> the off chance that RAM is being corrupted somehow.  See if disk operations
> work after the poke.
>
>
>
> --
> Coco mailing list
> Coco at maltedmedia.com
> http://five.pairlist.net/mailman/listinfo/coco


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