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Robert Ragen Comparing Friden 1151 Board with Equivalent Friden 130 Electronics
1968
This photo is clipped from an advertisement published by Texas Instruments
in 1968 touting their development of TTL Medium Scale Integrated Circuits
for Friden to match the functionality of the transistorized five-stage
switch-tail ring counters used in the earlier
Friden 130 counting circuitry.
These IC's were used to significantly shrink the size of the
Friden 1160-series CRT-display calculators
(Friden 1160,
Friden 1162, and
the Friden 1166); as
well as being used in Friden's first printing electronic
calculator, the
Friden 1150. The
photo shows Friden's Chief Calculator Architect, Robert Ragen, holding
a circuit board from the
Friden 1151
(a simple programmable version of the 1150) circuit board containing the
three Texas Instruments IC-based counter chips
along with the pair of transistoized circuit boards from the
Friden 130 that represent approximately the same circuitry as implemented
on the significantly smaller IC-based board. It appears the photo was
taken at one of Friden's 115x-series assembly line locations.