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Friden 1166 Logic Schematic


This is a logic-level schematic for the Friden 1166. The schematic includes all of the logic for the calculator at the gate and flip-flop level. The schematic only includes the circuitry located on the plug-in circuit boards, and does not include the power supply.

The numbers preceded by a "U" inside the logic symbols indicates the board number and IC package on the board in which the logic element exists. The first digit after the "U" indicates the board number, and the next two digits indicate the package number on the board. Packages on the circuit boards are numbered beginning at U1, starting at the upper left-hand corner of the circuit board, moving horizontally across the board with the package number sequentially incrementing, moving row at a time, left to right, through the package at the lower right-most point on the board. In general, the package number is identified by etched notations on the circuit board near each package. For example, U312, is on board #3, and is the 12th package on the board (marked on the board as U12), which is the "A Counter" IC, Part Number SN1286.

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Logic Schematic for Friden 1166 Electronic Calculator
March 1, 1969

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