AKA: BLACK JACK, BJ.21, AKA (Label): ENTERPREX BJ-21, PN: 943057, Product number (P/N): 943057,
Keywords/Tags: 943057 | BJ21 (BJ-21) | BLACK JACK
Date of intro: ~1977, Origin: Taiwan (List),
Power: 4.5V: (AA x3),
Display: Type = Display (VFD) (List), Digits = 12,
Number of keys: 20, #Key-Blue: 11, #Key-Green: 1, #Key-Orange: 8,
Miscellaneous switch: [(ArrowRight)-ON Game-Calc.],
Classification: / Pocket / Games,
Featuring: Square root, Logic-technology: VLSI (Very Large Scale Integration), calculator-on-a-Chip,
Related with: (Docu_Catalogs): MARKLINE 198009 (Fall); ENTERPREX_parts: (Box) BJ21,
Resemblance with: COMPEX: BJ21; RADIO SHACK: EC21,
Known Serial-numbers: 115428 | 24406 | 27055 (List of all S/Ns from ENTERPREX)
Collector value: 7/10,