Milan Pavlica YU7XW wrote:
> Sorry, full name is 82S137
>
> Milan Pavlica YU7XW wrote:
>
>
>>Hello!
>>I have one BAG of this PROMs. I do not have any infos on them. i couldnt
>>find any PDFs on internet on them
>>Please, can somebody help me on finding infos on them. I think that NS
>>is manufacturer
>>Also, any idea what i can build with them?

It's a 1Kx4 bipolar PROM; they were made by Signetics and other
companies. The 27S33, made by AMD and others, is a pin-compatible part.
I had no success at finding data sheets for either part number online,
but old data books should have info.

Bipolar PROMs used to be popular for storage of microcode and the like,
because they are fast (access speeds in the 15-40 ns range). They're
power-hungry, though. Mostly, cheap standard microprocessors killed the
niche for them; in the few applications that might still need such a
thing, I think people mostly use fast SRAM and load it from an EPROM or
flash ROM.

To use a bipolar PROM, you have to have some way of programming it.
Since they're not used much now, newer programmers aren't likely to
support them. There are a few currently available programmers that can
program bipolar PROMs, such as the Data I/O Chipwriter.

The entire product category is mostly extinct now, but TI evidently
still makes a few.
(http://www-s.ti.com/cgi-bin/sc/generic2.cgi?keyword=PROMS&status=2&family=PROMS&tech=All&return=2000)

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