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SHARP: CS31A
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AKA: Compet 30, AKA (Label): MODEL CS-31A, Product number (P/N): CS31A (CS-31A),
Keywords/Tags: CS31A (CS-31A) | 31A | Compet
Date of intro: feb-1967, Origin: Japan (List), Dimensions: 480x400x220mm, Weight: 13000g,
Power: AC,
Display: Type = Display (Nixie) (List), Brand = HITACHI: CD61 {14x}, Digits = 14, Extra Display features: Type = Display (Incandescent bulb) (List), Quantity = 2,
Number of keys: 26, #Key-Black: 4, #Key-Blue: 2, #Key-Red: 2, #Key-White: 18,
Classification: / Desktop with Display,
Featuring: Logic-technology: DTL (Diode Transistor Logic), discrete components / SSI: DTL (Diode Transistor Logic),
Related with: (Docu_Books): _Japanese, version-3,
Components: 14 PCB(s),
Main Components: SHARP: PCB with no Ref. 001; SHARP: 30APP; SHARP: 30ANo1; SHARP: 30ANo2; SHARP: 30ANo3; SHARP: 30AGP {5x}; SHARP: 30ANo9; SHARP: PCB with no Ref. 002; SHARP: 30ANo10; SHARP: 30ANo11,
Serie-members: SHARP: CS30A (No negative number representation, 100% discrete components); SHARP: CS30B (Negative number representation, 100% discrete components); SHARP: CS31A (Negative number representation, 1 PCB with early Bipolar IC's),
Known Serial-numbers: 726404 (List of all S/Ns from SHARP)
Collector value: 10/10,
Courtesy of: CALCUSEUM (Serge DEVIDTS),
Info: Although my version is holding a CS-30B Label (Black colored),
we must conclude this is probably a CS-31A milestone machine, since it's supporting a PCB with very early Bi-Polar IC's from MITSUBISHI.
Probably the first calculator supporting these IC's.
A big thanks to Rick from THE OLD CALCULATOR MUSEUM, pointing this out.

Internet: Link-1: DENTAKU MUSEUM
Intro-Sequence #: 6, Predecessor: SHARP: CS15A, Successor: SHARP: CS32A

Item

Display
Extra indicators on the left of the display

Internals

Internals

Internals (display)
Strange difference in height of Nixies

Internals (keyboard)

Internals (keyboard)
Space for extra keys

Internals (PCB)

Internals (PCB)

Internals (backPlane)

Internals (backPlane)

Panel, cabinet
Keyboard

Panel, cabinet
Keyboard

Label, name plate
S/N: 726404

Label, name plate
The 'misplaced' Label ?

Created: 07-apr-2015, Manual-update: 29-may-2021, Batch-update: 24-jun-2022             

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