Date   : Sat, 09 Dec 2006 22:07:23 +0000
From   : tbkc@... (salahdin mahmud)
Subject: how can I test if the 1770 and 8271 disc interface

> >
> > Unless it was dropped very hard, the 8271 is not likely to be damaged
> > much by the fall. It might have bent some of the pins. If the pins can 
>be
> > straightened out without breaking them, it should be ok.
>
>Even then it might be ok. Many years ago I dropped an AMX Super Art ROM
>while riding a bicycle at 20mph, therefore breaking some of the pins
>off. I soldered on replacement pins from some broken ICs and it still
>worked fine.
>
>I also once put a WordWise Plus ROM in backwards, on removal it was
>almost too hot to touch. It still worked when put back in the right way
>round.
>
>And only a couple of weeks ago I accidentally put a 6502 in backwards


>while trying to fix my Beeb with a scrolling fault. That still works too 
>:-)

fROM PAST EXPERIENCE, A ROM MAY SEMM TO WORK PERFECTLY, CAN DO THE USUAL 
THINGS, BUT ITS WHEN YEARS DOWN THE LINE YOU NOTICE A PROBLEM EG A 
PARTICULAR PROGRAM MAY NOT WORK(JUST 1 FROM OVER 200)  OR THE CHECKSUM GIVES 
A DIFFERENT VALUE.

SO JUST BECAUSE A ROM APPEARS TO BE FINE, IT DOESN'T MEANT IT'S ACTUALLY 
ERROR FREE!


>

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