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Tech Notes: Wang 700-Series LogiBloc Inventory
Updated 8/3/2004

This doument outlines the various Wang LogiBloc cards that make up each of the Wang 700-series calculators. The listing contains the LogiBloc identification number (always found in at least one location etched on the circuit board), the general function of the board, and columns indicating if the board is used within the various model calculators in the line. An "X" indicates that one of the boards is used in the model. A "-" indicates that the board is not used in the model. There are a few configurations which are not yet known. A "?" indicates that the board is not positively known to be used within the given model. Circuit board numbers highlighted as links point to original schematics of the circuit board.

Sincere thanks to Jim Battle for making the scans of the 700-series board schematics and providing them to the Old Calculator Web Museum.
Board
Number Function 700A 700B 700C 720A 720B 720C
335 +5/+12 Volt Regulation X X X X X X
336 -5/-12 Volt Regulation & Core Memory Protect X X X X X X
L505-X X Register Nixie Display Driver X X X X X X
L505-Y Y Register Nixie Display Driver X X X X X X
5887 1K x 8 Core Memory Array X X X - - -
5917 Core Memory Current Source, Temp. Compensation, X & Y Drivers X X X - - -
5918 4-Bit Arithmetic Logic Unit X X X X X X
5919 Data Bus Routing #1 X X X X X X
5920 Data Bus Routing #2 X X X X X X
5921 Core Memory Sense Amplifiers & Inhibit Drivers, Clock Generator X X X X X X
5922 ROM Microcode Decoding X X X X X X
5923 ROM Addressing X X - - - -
5924 Cassette Read/Write Amps, Nixie Scanner & Decoders X X X X X X
5926 Keyboard Interface, Core Memory Address Register X X X X X X
5927 Operation Mode Logic, Error Lamp Drivers, Display Blanking X X - ? ? -
5928 I/O Interface Buffer X X - ? ? -
5929 Core Memory Current Source, Temp. Compensation, X & Y Drivers - - - X X X
5930 ROM Addressing - - X ? ? X
5936 Nixie Display Board X X X X X X
5937 Keyboard Circuit Board X X X X X X
5938 Read Only Memory Board X X X X X X
5975 Operation Mode Logic, Error Lamp Drivers, Display Blanking - - X - - X
5976 I/O Interface Buffer - - X - - X
6038 2K x 8 Core Memory Array - - - X X X
6052 Power Supply Distribution & Tape Control X X X X X X
6055 Backplane Power Distribution X X X X X X
6084 Tape Drive Motor Switching ? ? X ? ? X
6085 ADAM Diode Board (Connects to Board 5917 or 5929) X X X X X X