AKA: BLACK JACK, BJ-21, Product number (P/N): BJ21 (BJ-21),
Keywords/Tags: BJ21 (BJ-21) | BLACK JACK
Date of intro: ~1978, Dimensions: 142x80x12mm,
Display: Type = Display (VFD) (List), Brand = FUTABA: 12ST22A, Digits = 10+1,
Number of keys: 20, #Key-Blue: 11, #Key-Green: 1, #Key-Red: 8,
Miscellaneous switch: [(ArrowRight)-ON Game-Calc.],
Classification: / Pocket / Games,
Featuring: Square root, Logic-technology: VLSI (Very Large Scale Integration), calculator-on-a-Chip,
Main Components: NEC: D1021C,
Resemblance with: ENTERPREX: BJ21; RADIO SHACK: EC21,
Collector value: 7/10,
Courtesy of: DUDEK Emil,
Internet: Link-1: VINTAGE TECHNOLOGY