[Coco] Weird CoCo3 problem...

[Brian Blake]

Hi Mike,

Yes, it works fine in my other CoCo's.




________________________________
From: Mike Pepe <lamune at doki-doki.net>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Fri, January 1, 2010 3:26:33 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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