[Coco] Fixing my "F" board TDP-100...

[Steve Batson]

I hear ya, probably a long shot about a bad keyboard, but one small part got messed up, dirty, shorted, whatever, could screw up the entire matrix.

On Apr 20, 2015, at 10:38 AM, Al Hartman <alhartman6 at optonline.net> wrote:

> There re no joysticks attached. It's just the computer alone. I can try swapping the keyboard later with the one from the "E" board Coco, but there's not much to go wrong in a keyboard. I tried swapping the two 6821 chips because I thought maybe they were bad.
> 
> The only chip I have not swapped is the VDG chip.
> 
> -[ Al ]-
> 
> -----Original Message----- From: Steve Batson
> 
> Can you swap the whole keyboard? Also, and I may be remembering this wrong, but seemed like faulty Joysticks can cause strange things to happen. Like the button pressed and you couldn't type. Maybe bad joystick or port
> 
> Steve Batson
> Batson Photography
> "Today's Special Moments, Tomorrow's Priceless Treasures"
> 
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>> On Apr 20, 2015, at 7:46 AM, Al Hartman <alhartman6 at optonline.net> wrote:
>> 
>> Came back from the hospital, and had a little energy...
>> 
>> - I swapped the 6809EP chip, no change.
>> 
>> - I swapped the RAM and now it boots to a good screen. But, I can’t type: “? Mem” The computer clears the screen, and prints a “.” when I press the “?”. If I type “PRINT”, IT COMES OUT “PRININT”.
>> 
>> - I resat the keyboard connector (HJL keyboard), no change.
>> 
>> - I swapped the SAM, no change.
>> 
>> - I swapped both 6821 chips, no change.
>> 
>> - If I plug in the RAM CHECKER cartridge, the screen goes into a graphics mode, and displays junk.
>> 
>> - The only chip I haven’t changed is the 6847 VDG. I didn’t have a spare, I need one for the Dragon (I thought I had one), so I ordered two on eBay, and two sets of 64k RAM. I need one for a Coco 2 here, and one for the Dragon. Once I have this working, I’ll test every chip I have and hopefully, I’ll have enough chips to upgrade the “E” board Coco.
>> 
>> It may be that I just need to buy an “F” board Coco and swap the logic board in...
>> 
>> -[ Al ]-
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