Apple Disk II, was Re: TRS-80 Model I

[Tom]

At 06:56 PM 2/4/2007 -0500, you wrote:
>On Feb 4, 2007, at 4:05 PM, Tom Peters wrote:
>>Before even letting the customer leave the premises, I'd quickly
>>take out the four screws that held on the cover and show them the
>>blackened spot on the inside of the cover, then show them the
>>74LS125 in the middle of the board, which invariably had been
>>cracked or cratered.
>>
>>The documentation clearly said, connect the ribbon cable to the
>>controller with the cable exiting AWAY from the board. But there
>>were any number of folks that went the long way around, and put a
>>great deal of effort into bending the cable sharply where it exited
>>the ID connection, so that they could plug it into the controller
>>card backwards.
>>
>>This usually resulted in a spectacular failure of the '125.
>
>   Did that failure take out anything else, or did replacing only the
>74LS125 solve the problem?
>
>           -Dave

It's been along time-- The one or two times I attempted component level 
repair, I can't remember what the result was. We did a swap on the board 
and the customer had to pay for it.


>--
>Dave McGuire
>Port Charlotte, FL
>
>


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