Casio 101-S Desktop Calculator
The Casio 101-S is one of quite 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, with the 101-S using individual vacuum-fluorscent 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 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 press 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 chipset 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 complement of dicrete transistors(clock generator), a few diodes, and a sprinkling of capacitors and resistors as well as some hybrid inline multi-resitor packages. The power supply uses 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.
|Manufacturer:||Casio Computer Co., Ltd.|
|Price:||$279 at Introduction, $225 by February, 1973|
|Display Technology:||Individual Vacuum-Fluorescent Eight-Segment Display Tubes with Right-Hand Decimal Point|
|Logic Technology:||Hitachi HD32xx-series five-chip LSI chipset|
|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, 9 1/2" deep, 1 1/2" high|
|Notes:||Unusual half-sized zeroes|