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Casio 101-S Desktop Calculator

Casio 101-S

The Casio 101-S is one of a lengthy series of calculators in Casio's 101 line that began all the way back in the early days of Casio calculators with the original discrete transistor Casio 101. As with all of the calculators in Casio's 101-series, the 101-S has a capacity of ten digits, using individual vacuum-fluorescent tubes for display. The 101-S was introduced in mid-1972, and sold for $279 at introduction.

The 101-S provides the four basic math functions along with a single accumulator-style memory register with individual keys to add [M+] and subtract [M-] the content of the display to/from the memory. The [T] key recalls the content of the memory register to the display and clears the memory register. The [C] key acts as a clear entry key, providing for erasing any incorrectly entered number provided it is pressed before any function key. Pressing both the [T] key and the [C] key simultaneously will clear the entire machine. The calculator operates with fixed decimal point which is slide-switch selectable at 0, 1, 2, 3, 4 or 6 digits behind the decimal point. A rounding-mode switch provides 5-up/4-down roundoff or truncation modes.

The brains of the machine are made up of a five-chip LSI chip-set made by Hitachi. A number of small-scale Hitachi-made chips provide glue logic and interfacing functions. Along with the ICs, there's a small number of discrete transistors(clock generator), a few diodes, and a sprinkling of capacitors and resistors as well as some hybrid inline multi-resistor packages. The power supply uses a conventional transformer, with linear Zener-diode/pass-transistor regulation for the logic power supplies, along with a small switching power supply to generate the higher grid voltage needed by the Vacuum-Fluorescent display tubes.

Casio 101-S Specifications

Manufacturer:  Casio Computer Co., Ltd.
Model Number:  101-S
Introduced:  Mid-1972
Price:  $279 at Introduction, $225 by February, 1973
Manufactured In:  Japan
Display Technology:  Individual Vacuum-Fluorescent Eight-Segment Display Tubes with Right-Hand Decimal Point
Logic Technology:  Hitachi HD32xx-series five-chip microcoded LSI chip-set
Numerous Hitachi Small-Scale Glue ICs
Digits of Capacity:  10
Decimal Modes:  Fixed. Switch selectable at 0, 1, 2, 3, 4, or 6 digits behind decimal point
Math Functions:  Four Function
Memories:  One accumulator-style memory register
Size:  7" wide, 8 1/10" deep, 2 3/5" high
Weight:  3 pounds
Power Supply:  115V AC, 60Hz, 6 Watts
Performance:  (Mfg. Claimed Maximums)
Addition/Subtraction:  40mS (0.04 Second)
Multiplication/Division:  300mS (0.3 Second)
Memory Recall:  50mS (0.05 Second)
Notes:  Unusual half-sized zeroes

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