AKA: MARK 21, Electronic Memory Calculator, AKA (Label): mark 21, HANDHELD MEMORY CALCULATOR, 215901, Product number (P/N): 21,
Keywords/Tags: 21 | MARK 21 | Electronic Memory Calculator
Date of intro: 1975, Origin: Japan (List), Dimensions: 161x74x28mm,
Adaptor: APF_adaptors: 751S,
Display: Type = Display (VFD) (List), Digits = 8,
Number of keys: 24, #Key-Black: 19, #Key-White: 5,
Keyboard Array (Rows x Columns): 05x05,
Miscellaneous switch: [OFF-ON],
Classification: / Pocket,
Featuring: Procent, Logic-technology: VLSI (Very Large Scale Integration), calculator-on-a-Chip, Memories: 1,
Main Components: MOS TECHNOLOGY: MPS7545,
Known Serial-numbers: A0021901044 (A-002190, 1044) | MT0198157545 (MT-019815, 7545) | MT027530 (MT-027530) | MT0352717545 (MT-035271, 7545) | MT0612837545 (MT-061283, 7545) | R006187 (R-006187) | R018030215901 (R-018030, 215901) | R019842215901 (R-019842, 215901) (List of all S/Ns from APF)
Collector value: 7/10,
Internet: Link-1: SMITHSONIAN MUSIC