AKA: MEMORY, 21R, Product number (P/N): 21R,
Keywords/Tags: 21R | MEMORY
Date of intro: 1974, Origin: United Kingdom (List), Dimensions: 155x75x25mm, Weight: 140g,
Power: 9V + Adaptor,
Display: Type = Display (LED) (List), Digits = 8+1,
Number of keys: 20, #Key-Brown: 20,
Keyboard Array (Rows x Columns): 05x04,
Classification: / Pocket,
Featuring: Procent, Logic-technology: VLSI (Very Large Scale Integration), calculator-on-a-Chip, Memories: 1,
Related with: ROCKWELL_docu: (Ad.) *: Because life is... (10R,12R,21R,51R,61R,63R,82R); ROCKWELL_docu: (Instr.) *: Die Antwort (20R,21R),
Components: 15 ... 2 Capacitor(s), 12 Resistor(s), 1 IC(s),
Main Components: ROCKWELL: 20167D57,
Serie-members: ROCKWELL: 21R (version-1) ('MEMORY'- and '21R'-notation on keyboard); ROCKWELL: 21R (version-2) (No 'MEMORY'- and '21R'-notation on keyboard),
Known Serial-numbers: 3B10799 | 3B18172 (3B 18172) | 3B2?789 (List of all S/Ns from ROCKWELL)
Initial Cost Price: USD49.95, Collector value: 7.5/10,
Courtesy of: CALCUSEUM (Serge DEVIDTS),
Internet: Link-1: ANITA CALCULATORS, Link-2: VINTAGE TECHNOLOGY