|Texas developed a RPN calculator in 1970's|
Message #1 Posted by gileno on 30 Nov 2008, 1:48 p.m.
The RPN logic, widely employed in the Hewlett-Packard (HP)
calculators, were about to be adopted by Texas Instruments, the
main HP rival in the calculator market. The Texas project have been
kept in secret since 1970's, until recently discovered.Link TI-51 RPN !!!
Some TI-51 VI calculator prototypes have been manufactured, working
in RPN logic, and featuring the typical dual-width ENTER key,
normally found in HP machines. The TI-51 VI is a version of the
algebraic-logic model TI-51 III.
According to rumours, Texas Instruments were forced to abandon the
project, otherwise they'll need to pay royalties to Johann
Luckewicz, grand-grandson of Jan Luckewicz, the creator of RPN
logic. Such royalties are estimated to reach an amount of many
billion dollars. HP is supposed to succesfully negotiate a
perpetual license trade from Johann Luckewicz, while he was drunk.
Because this license, HP is the only manufacturer authorized to use
After founding the legal issue, Texas readily cancelled the RPN
project, and commanded the destruction of all prototypes and
associated documents, aware of juridical demands. Extra-official
informers referred a secret agreement, involving Luckewicz-grand-
grandson (sober), Texas and HP, to keep the market under monopoly.
Texas Instruments and Hewlett-Packard, both USA companies, are the
main scientific calculator manufacturers, since the first portable
models were developed. A Japanese committee, leaded by Casio and
Sharp, declared its intention to accuse HP and Texas to
International Chamber of Commerce, alleging monopoly of RPN system
and abusive trust, respectively. Texas and HP CEOs refused to talk
about the Japanese inquiry.
This picture shows a very rare TI-51 VI unit. It belongs to a
former Texas R&D engineer, which succesfully hid and kept the
calculator when he moved to Lirpa Labs. This unit is supposed to be
the last TI-51 VI still intact. Its collectible value is