On Mon, 10 Feb 2003, Vintage Computer Festival wrote:
> I am looking at a chip that is causing me confusing with regards to its
> actual date code.
>
> The chip is labeled thusly:
>
> (logo) /718
> DM74157N
> 9322
>
> (logo) looks something like this: /\/
> /\/
>
> ...which probably makes it National Semiconductor.
>
> My first instinct is to guess that its date code is 9322. However, it
> does not fit within the context of the rest of the board, which is 1976.
> They are definitely not original, as the board calls for a 74257 but the
> 74157 has been put in its place with the addition of a capacitor across +5
> and ground.
>
> Is it possible that the date code is actually "/718", and what I am seeing
> as a slash is actually what remains of a '7' that wasn't printed
> correctly?
>
Probably 7718 date code because 9322 is the old Faichild 9300 serial part
number for the 74157...
BTW the 157 and 257 are pretty much interchangeble if the enable pin is
grounded...
> --
>
> Sellam Ismail Vintage Computer Festival
> ------------------------------------------------------------------------------
> International Man of Intrigue and Danger http://www.vintage.org
>
> * Old computing resources for business and academia at www.VintageTech.com *
>
Peter Wallace
Received on Mon Feb 10 2003 - 11:51:01 GMT