Casio Mini Electronic Calculator

Date of introduction:  1973 Display technology:  LED-modules
New price:   Display size:  8
Size:  5.8" x 3.1" x 1.8"
 148 x 80 x 45 mm3
Weight:  8.1 ounces, 231 grams Serial No:  1047597
Batteries:  4*AA Date of manufacture:  mth 10 year 1973
AC-Adapter:  AD-4145 Origin of manufacture:  Japan
Precision:  8  Integrated circuits:  TMS0126
Program steps:   Courtesy of:  Joerg Woerner

Root-8S_BACK.jpg (467680 Byte)This ROOT-8S calculator was introduced in 1973 and is one of the few Casio calculators based on Texas Instruments technology. Most early Casio calculators -  including the Mini CM-601 - are based on Hitachi chips, some on NEC chips but as of today we know only two calculators with TI chips.

Root-8S_PCB.jpg (120551 Byte)We know the TMS0126 "calculator-on-a-chip" located in this Casio ROOT-8S manufactured end of 1973 already from the Canon LE-80R. Canon, in contrast to Casio, developed already in 1969 a long-lasting relationship with Texas Instruments, please remember the legendary Pocketronic basd on the technology developed with the Cal-Tech project.

Root-8S_IC.jpg (102180 Byte)The TMS0126 single-chip calculator circuit is similar to the TMS0120 developed for the SR-10 and introduced almost one year earlier.


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Joerg Woerner, January 17, 2010. No reprints without written permission.