A92: Benchtest of TI-92, 92II and 92+
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A92: Benchtest of TI-92, 92II and 92+
Since there have been some controversies regarding the speed of TI-92 and
its clones TI-92II and TI-92+ I have compiled a list of measured benchmarks.
As a benchmark test I have chosen inversion of a 10 by 10 matrix in both
"approximate" and "exact" mode, i.e.,
randmat(10,10)^-1
Note that the choice is not beneficial for TI-92 if it is to be compared to
other calculators since the algorithm for inversion of matrices seems
unnecessary slow. According to John Edry <jeejohn@aol.com> inversion of a
30 by 30 matrix takes 1297s on a TI-92 against only 174 s on a TI-85 and 81
s on a HP-48GX. The time for inverting an (N*N) integer matrix on a TI-92
grows as expected N^3 for approximative calculations but almost as N^4 for
exact calculations. However, the simple benchmark suffices for indicating
the speed differencie between the different TI-92 clones. Note that the
values between units of the same type can vary a few percent due to
variations in battery condition, clock speed and memory status (e.g. the
calculator slows down when the history file grows). All times are in seconds
Calculator Exact Approximative Measured by
__________________________________________________________
TI-92 45 26 RS
TI-92II 32 18 GJ
TI-92+ 31 21 JMF
TI-92ext 32 18 JJM
TI-92acc1 17 10 RS
TI-92ext/acc2 12 7 JJM
ext= home made memory extension, see www-page of Jean-Jacques Michel
http://www.daewoo.fr/~jjm/ti92.html
acc1=accelerated (C11=10pF), see webpage of Boris Lutz
http://cccsrv.trevano.ch/~blutz/TI92Spec/TIAccelerate.html
acc2=accelerated (C11=8.2pF)
RS=Richard Schatz (myself) <rschatz@ele.kth.se>
GJ=Gareth James <hjames@globalnet.co.uk>
JMF=JM Ferrard <jm-ferrard@infonie.fr>
JJM=Jean-Jacques Michel <jjm@han.daewoo.fr>
Note that the values for TI-92+ is for a beta-version since it has not been
released yet. The conclusion is that the TI-92+ is a bit faster than TI-92
and approximately similar to TI-92II. The values for the "home" extended
TI-92 confirms that this speed increase is solely due to the larger (and
better organised) memory which can utilise the 16 bit bus instead of
addressing the internal 8 bit RAM-memory twice.
JM Ferrard has done a comprehensive review (72! screenshots) of TI-92 that
can (in french) be found on the web
http://www.mygale.org/03/ti92plus/document/ferrard/ferrard.htm
For those (like me) who are not familiar with the french language he has
also made an english version which he was kind to mail me. I have relayed
it on
http://www.ele.kth.se/FMI/staff/92+_eng.zip
It is a zipped RTF-file which should be possible to open with e.g. Word.
I want to thank all contributors to this benchtest
=================================
Richard Schatz, PhD
Royal Institute of Technology
Laboratory of Photonics and Microwave Eng.
KTH/ELE/FMI/ELECTRUM 229
S-164 40 Kista-Stockholm, SWEDEN
Phone: +46 8 752 1271
Fax:+46 8 752 1240
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