[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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