Apple Disk II, was Re: TRS-80 Model I
mcguire at neurotica.com
Sun Feb 4 17:56:07 CST 2007
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?
Port Charlotte, FL
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