11 Apr
2002
11 Apr
'02
6:14 a.m.
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
>
>
>