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Old ic¡¯s

 

I am looking for 74ls387n, mc10231a, and MC10102P chips does anyone have source? I have done a lot of searching
 

Are you certain about the 74LS387 part number? I can't even find a data sheet for that.

the MC10231 and MC10102 are both ECL parts and seem to be available (-ish) on the auction site. I can easily find data sheets for them, even listings on Mouser (that say they are obsolete and not available).

The only reference I can find for the 74x387 is on Wikipedia, which says it is a 1024-bit (256x4) PROM. It does not indicate that there was an LS version, only an S version. Do you have the PROM contents for the chip you are replacing, or a way to program the blank PROM if you had one?

-- Jeff Dutky
 

Used MC10102Ps are available from utsource.?? I have no connection to this supplier, but have purchased parts from them previously without any problems.



Regards



Kerry





From: <[email protected]> on behalf of mystic96 <clbarber1@...>
Reply to: <[email protected]>
Date: Friday, 15 April 2022 at 4:15 pm
To: <[email protected]>
Subject: [TekScopes] Old ic¡¯s



I am looking for 74ls387n, mc10231a, and MC10102P chips does anyone have source? I have done a lot of searching
 

74[L]S387 did ring an ancient bell.

I could find a reference here on page 5-13:

"U65 will normally be a *74S287* or *74S387*. These are fusible link programmable read only memories. They have eight inputs, two disables, and four outputs. Each output can be programmed (permanently) to produce any function of eight input variables, controlled on an on-or-off basis by two more variables, the disables."

However, DEC sees the *74LS387* as tri-state buffers, on page 147:

and Mostek too, non-tristate, page 4-17:


Curiouser and curiouser...
I'd have to dig deep in the old boxes for the TTL databooks.

Arie

On 2022-04-15 08:59, Jeff Dutky wrote:


Are you certain about the 74LS387 part number? I can't even find a data
sheet for that.

the MC10231 and MC10102 are both ECL parts and seem to be
available (-ish) on the auction site. I can easily find data sheets for
them, even listings on Mouser (that say they are obsolete and not
available).

The only reference I can find for the 74x387 is on Wikipedia,
which says it is a 1024-bit (256x4) PROM. It does not indicate that there
was an LS version, only an S version. Do you have the PROM contents for
the chip you are replacing, or a way to program the blank PROM if you had
one?

-- Jeff Dutky
 



Dario
 

On Fri, Apr 15, 2022 at 09:54 AM, Arie de Muijnck wrote:


However, DEC sees the *74LS387* as tri-state buffers, on page 147:

The device ID in DEC's handbook is a 74LS367, not '387. Difficult to read in the scan though. It matches the '367's function and pinout.

The '387 could be something like MMI's 6300/01 1K x 1 bit fusible link PROM.

Raymond
 

On Fri, Apr 15, 2022 at 11:50 AM, Raymond Domp Frank wrote:


The '387 could be something like MMI's 6300/01 1K x 1 bit fusible link PROM.
Sorry, that'd be MMI's 6330/31 256 x 4 bit fusible link PROM (8 address bits, 4 data bits).

Raymond
 

The 74S387 is already obsolete in 1984 TI TTL Data Book: "contact the factory for abaility " and "has been superceded by the TBP 24S10".
Albert

On Fri, Apr 15, 2022 at 11:03 AM, Dario wrote:




Dario
 

I think that the 74LS387was used to store phone numbers in some mid '70s
phone dialers for security systems. I'm not sure, because I haven't seen
one in 45 years.

On Fri, Apr 15, 2022 at 2:15 AM mystic96 <clbarber1@...> wrote:

I am looking for 74ls387n, mc10231a, and MC10102P chips does anyone have
source? I have done a lot of searching
 

Is this to repair a specific board in your collection? If so what board/device?
 

My 2nd try at posting this...

No connection to, or experience w/ them, but Unicorn Electronics has the 74S387 listed for $4.99.
 

The '387 part may be possible to procure, but may well prove difficult to program. An off-the-wall suggestion would be to use a 22V10 to simulate the functionality of the programmed '387. The access time looks compatible. Programming the 22V10 will be easier, writing the source code for the programming maybe not so much. There would also be a slight adaption issue at the HW level.
 

Actually the HW adaption mightn't be all that hard. Link pins 11 & 12. Pretend pin 11 is the 387's pin 8 (GND). Link pins 24 & 21. Pretend pin 21 is the 387's pin 16 (Vcc). Maybe link pins 1, 2, 3, 13, 22, & 23 to GND.

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