AKA (Label): MODEL NO: MARK 77, Product number (P/N): 77,
Keywords/Tags: 77 | MARK 77 | 571340407721 (57134, 0407721)
Date of intro: ~1975, Origin: Japan (List),
Adaptor: APF_adaptors: 751S,
Number of keys: 29, #Key-Black: 11, #Key-Orange: 9, #Key-White: 9,
Keyboard Array (Rows x Columns): 06x05,
Miscellaneous switch: [OFF-ON],
Classification: / Pocket,
Featuring: Procent, Square root, PI, Logic-technology: VLSI (Very Large Scale Integration), calculator-on-a-Chip,
Related with: APF_parts: (Box) 751S,
Known Serial-numbers: A002607 (A-002607) (List of all S/Ns from APF)
Collector value: 7/10,