[Coco] Weird CoCo3 problem...

[Bruce W. Calkins]

Yes.  The only one(s) with any problems are the first Radio Shack 26-3022 
controller that needed 12 volts and a third party one that could not handle 
the double speed poke.
Bruce W.
==============

----- Original Message ----- 
From: "Mike Pepe" <lamune at doki-doki.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Friday, January 01, 2010 3:26 PM
Subject: Re: [Coco] Weird CoCo3 problem...


> Does the FD502 controller work in other CoCos?
>
>> -----Original Message-----
>> From: coco-bounces at maltedmedia.com [mailto:coco-
>> bounces at maltedmedia.com] On Behalf Of Brian Blake
>> Sent: Friday, January 01, 2010 11:54 AM
>> To: CoCoList for Color Computer Enthusiasts
>> Subject: Re: [Coco] Weird CoCo3 problem...
>>
>> I'll take part of that back - that is R22 that has been shorted and R23
>> looks like one of it's legs had been cut, then re-soldered. R22 & R23
>> go to /RAS & /CAS on the GIME - at this point I don't know if that
>> would have anything to do with the problem I'm having with this one or
>> not... still digging.
>>
>>
>> Brian
>>
>>
>>
>> ________________________________
>> From: Brian Blake <random_rodder at yahoo.com>
>> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
>> Sent: Fri, January 1, 2010 2:05:13 PM
>> Subject: [Coco] Weird CoCo3 problem...
>>
>>
>>
>> All of these new developments on the CoCo front finally lit the fire
>> under my arse to set up real hardware again. Besides my repack project,
>> I have 3 other CoCo3's, two with 512k upgrades (one C9 and one PBJ) and
>> one 128k. The one with the C9 upgrade works fine - can load and play
>> Sockmaster's Donkey Kong.
>>
>> The one with the PBJ upgrade, not so... At boot, it comes up as it
>> should with the proper display. However, any floppy commands are met
>> with no response from the floppy drive (with an FD-502 controller) at
>> all. Almost like the drive is off. The drive responds as it should in
>> the other two machines. Upon removing the top case and k/b, I saw two
>> wires, each had been soldered to opposite sides of R23. Now, under the
>> keyboard, is another wire with alligator clips on each end, and the
>> clips are holding on to the bare end of the wires soldered to R23,
>> effectively bypassing the resistor. I'm looking for the PBJ
>> instructions, pretty sure I have them, to find out if this is called
>> for. I can also see where C65 & C66 have been cut and re-soldered. I
>> have reseated the GIME and the PBJ memory chips, and cleaned the 40 pin
>> connector.
>>
>> Any other suggestions? My 100MHz o'scope bit the dust so I don't have
>> that tool any more (anybody have a CRT for a Leader 3 channel 100MHz
>> scope??)
>>
>>
>> Thanks,
>>
>> Brian
>>
>>
>>
>>
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>>
>>
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