This site presents some technical data about these machines for those who may have an interest or need for it. The site is organized broadly into:
Most of this data has been derived from the reverse engineering of various calculators. An example of this process is presented in the tale of fixing the Facit 1123.
The initial motivation for deriving and collecting this data was to assist in the repair of the units.
However it has turned into an interesting study in the variety of technology, architecture and algorithms used.
SSI-based calculators from the late 1960s were some of the first products marketed outside the military and large-institutional markets to utilise digital integrated circuits. The "bit-at-a-time serial-data" architecture of most of these units harkened back to the architecture of some of the first computers such as the
|Desk Calculators||Pocket Calculators|
| Integrated Circuits