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 > > >