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Toshiba BC-8111

Date of introduction:  1977 Display technology:  Fluorescent
New price:   Display size:  8
Size:  5.6" x 3.0" x 0.8"
 142 x 75 x 20 mm3
   
Weight:  4.0 ounces, 112 grams Serial No:  225847
Batteries:  2*AA Date of manufacture:  year 1978
AC-Adapter:  BH-115 (110V) or
 BH-116 (220V)
Origin of manufacture:  Japan
Precision:  8 Integrated circuits:  NEC uPD1803C
Memories:  1 Displays:  Itron FG95B6
Program steps:   Courtesy of:  Joerg Woerner

Toshiba introduced this BC-8111 and its sibling BC-8018 in 1977 as successors of the BC-815 and BC-8111, respectively in a smaller package.

Dismantling the featured Toshiba BC-8111 manufactured in 1978 in Japan reveals a very cost effective design using a single-sided printed circuit board (PCB) centered around a NEC uPD1803C single-chip calculator circuit connected to a 9-digit Vacuum Fluorescent Display (VFD), a keyboard assembly and powered by 2 AA-sized alkaline batteries.

The NEC uPD1803C chip was introduced in 1976 seems to be from a technology point of view slightly ahead of the TMS1070 used with other Toshiba calculators like the BC-1015 and integrated already the "pull down" resistors needed to bias the anodes and grids of the display with respect to the filament. Texas Instruments caught up with the introduction of the TMS1040 Product Family and the Toshiba BC-8111B calculator switched its internals to a TMS1045 single-chip calculator circuit.

The BC-8018 uses an identical printed circuit board (PCB) populated with the NEC uPD1802C calculator chip and misses the memory keys.

Production of the BC-8018 and BC-8111 was eventually shifted from Japan to Taiwan and the calculators renamed to BC-8018B and BC-8111B.

 

 



If you have additions to the above article please email: joerg@datamath.org.

Joerg Woerner, December 11, 2002. No reprints without written permission.