+Home     Museum     Advertising     Wanted     Articles     EMail  

Old Calculator Web Museum Documentation Archive

Friden 1155 Instruction Manual

This document is the general reference manual for the Friden 1155 Advanced Programmable electronic calculator.

The Friden 1155 was similar in appearance to the earlier machines in the Friden 115x-series (such as the Friden 1152), but was a complete departure from the architecture of the 115x-series, utilizing a mix of small and medium-scale DTL and TTL logic IC logic, combined with MOS Large-Scale integrated circuits, including large capacity shift registers (for program step storage), very early RAM ICs (for working registers and memory registers), and ROM ICs for storing two-levels of microcode that directs the operation of the calculator.

This design is rumored to have been outsourced to an external consultant, much to the the upset what remained of Friden's calculator engineering team. The 1155 provided 13-digits of precision, with scientific notation exponents ranging from -99 to +99. It featured 20 memory registers, up to 511 program step storage, and two working registers. An optional magnetic card reader peripheral, the model 511, could be plugged into a connector on the back panel of the calculator to allow storing and loading programs from magnetic cards. The machine provided a large repertoire of math functions, including reciprocal, logarithms, exponentials, trigonometric functions, factorials, square root, and polar<->rectangular conversion.



Your Browser Does Not Support Embedded PDF, Please See Download Link Below

Friden 1155 Advanced Programmaber Calculator Reference Manual
Published September, 1972
Document Scan Courtesy of Mr. Al Kossow, bitsavers.org


This document is presented as an embedded PDF. You may need to click above this text, or refresh the page for image to show, depending on your browser.
If the document does not appear above, you may click HERE to download/view it on your PDF viewer program

If you don't have Adobe Acrobat Reader or some other form of PDF viewing program, you may not be able to view this document.