Signetics N82S115 ROMs

[John Robertson]

CRC wrote:
> Does anyone have experience with these programmable bipolar ROMs 
> failing after a long period of time? I have an old piece of test 
> equipment that has 8X300 running the display reading its program from 
> the aforementioned ROMs and the text info is missing pixels - 
> apparently in the same place in the same letters.
>
>
If there are any 7448s or 7447s in the display I would be checking them 
first.

A number of our early video games use those PROMs and I have not had any 
failures. You can subsitute an Eprom if you are willing to glomp up 
interface wiring between the two.  Certainly you could read the PROMs 
and reconstruct the missing data if you were so inclined.

I should be able to burn a replacement if you can't find anyone else and 
can get a blank 82S115 as my  Andromeda PROM reader claims it can handle 
them...

John :-#)#

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