AKA: konkret 400, Product number (P/N): 400,
Keywords/Tags: 400 | konkret
Date of intro: 1977, Origin: DDR (List),
Power: Rechargeable,
Display: Type = Display (LED) (List), Brand = RFT: VK12,
Number of keys: 20, #Key-Black: 8, #Key-Blue: 11, #Key-Red: 1,
Classification: / Pocket,
Featuring: Square root, Logic-technology: VLSI (Very Large Scale Integration), calculator-on-a-Chip,
Serie-members: RFT: 400 (version-1) (Green/Black); RFT: 400 (version-2) (White keyboard with 11 Blue keys); RFT: 400 (version-3) (Black keyboard with 11 White keys); RFT: 400 (version-4) (Black keyboard with 8 Red keys),
Known Serial-numbers: 003535 (List of all S/Ns from RFT)
Collector value: 8/10,
Courtesy of: AE,
Predecessor: RFT: 100, Successor: RFT: 600 (version-1)