Product number (P/N): 91S,
Keywords/Tags: 91S
Date of intro: ~feb-1976,
Display: Type = Display (VFD) (List), Digits = 8+1,
Number of keys: 27, #Key-Black: 10, #Key-Blue: 4, #Key-Red: 2, #Key-White: 11,
Keyboard Array (Rows x Columns): 06x05, Keyboard Layout: [CI] [C] - [(SquareRoot)] [(Pi)] [(-)] [%] [x<>y] - [7] [8] [9] [(Division)] [CM] - [4] [5] [6] [x] [M-] - [0] [.] [=] [+] [M+],
Decimal switch: [F-2-3-OFF],
Classification: / Pocket,
Featuring: Procent, Square root, PI, Logic-technology: VLSI (Very Large Scale Integration), calculator-on-a-Chip, Memories: 1,
Resemblance with: IMPERIAL: 91S; TRIUMPH-ADLER: 81S (version-5), (Resemblance 033),
Serie-members: ROYAL: 91S (version-1) (Black); ROYAL: 91S (version-2) (Beige),
Collector value: 7/10,