DATAMATH CALCULATOR MUSEUM
RFT minirex 73
|Date of introduction:||Display technology:||LED-modules|
|New price:||Display size:||8|
|Size:||5.5" x 3.2" x 1.3"|
|Weight:||11 ounces||Serial No:||009903|
|Batteries:||4*NiCd||Date of manufacture:||year 1973|
|AC-Adapter:||Origin of manufacture:||GDR|
|Precision:||8||Integrated circuits:||S2144 or MK5020A|
|Program steps:||Courtesy of:||Gerhard Wenzel|
The minirex 73 manufactured in the GDR (German Democratic Republic) end of the year 1975 looks similar to other calculators based on TI's calculator chips. Compare it e.g. with the famous Bowmar 901B.
minirex 73 uses a charging craddle as a comfortable stand during operation and
to charge the four internal NiCd-batteries (picture shows minirex 75). The
calculator was later replaced with the minirex 74 and minirex
From the technical point the inside of the minirex 73 is from higher interest than the awful appearance. The picture on the right shows the minirex 73, 74 and 75 from left to the right. The earliest calculator uses a US calculator chip, the next a GDR developed one-to-one copy of a TI chip and the latest product the original TMS0105.
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© Joerg Woerner, December 5, 2001. No reprints without written permission.