I found a TI data book dated 1971 and it doesn't even mention 12xx ICs. It appears that by 1971 TI had switched entirely to the 54/74xx series. I have a couple of even older TI books if I can find them.
Joe
>
>Rick,
>
> SOMEWHERE I have an old TI IC catalog from around that time period. I'll try and find it and look them up.
>
> Joe
>
>At 06:44 AM 4/10/02 -0700, you wrote:
>>Hello,
>>
>>I've come across some old TI IC's that I'm hoping someone out there can
>>shed some light on.
>>
>>The date codes on the chips place them in late '67 to early '68.
>>The part numbers are:
>>
>>SN1286
>>SN1287
>>SN1288
>>
>>They are in 24-pin dual-inline plastic packages. The pin spacing 0.10
>>inch
>>between pins, and 0.50 inch between the rows of pins.
>>
>>These three chips are on a board that is populated with SSI DTL & early
>>TTL devices
>>in the SN15xxx and SN58xx DTL families, and SN74xx (only SN7474) TTL
>>devices.
>>All of the SSI stuff has date codes ranging from 6742 (week 42 '67) to
>>6804
>>(week 4 '68).
>>
>>Can anyone out there shed any light on these old devices?
>>
>>Yes...the board with these chips on them is from an old Singer/Friden
>>calculator.
>>
>>Thanks,
>>Rick Bensene
>>The Old Calculator Web Museum
>>http://www.geocities.com/oldcalculators
>>
>>
>>
Received on Thu Apr 11 2002 - 13:14:02 BST