The HP-11C was a mid range scientific programmable calculator. Compared to the previous series it would fall between the HP-33E/C and HP-34C. It also included two new features: a built-in random number generator and a backspace key that allowed numbers to be corrected a digit at a time.
Compared to the HP-10C, the HP-11C also included:
- Hyperbolic and inverse hyperbolic trig functions.
- Probability (combinations and permutations).
- Factorial, % change, and absolute value.
- And, as mentioned above, backspace and a random number generator.
- Type: Programmable Scientific
- Manufacturer: Hewlett-Packard
- Introduced: 1981
- Discontinued: 1989
- Cost: USD 135
- Calculator Entry mode: RPN
- Display type: LCD seven-segment display
- Display size: 10 digits
- CPU Processor: HP Nut core (1LF5 / 1LM2 / 1LQ9)
- Programming language(s): Keystroke programmable (fully merged)
- Memory register: 0…20 registers (R0…R9,R.0…R.9) plus RI, X, Y, Z, T,LAST X
- Program steps: 63…203 lines
- Power consumption: 0.25 mW
- Length: 5.1"
- Width: 3.1"
- Height: 0.6"
- Weight: 4oz
Hewlett-Packard HP-11C Owner's Handbook and Problem-Solving Guide (PDF) (G ed.). Corvallis, Oregon, USA: Hewlett-Packard Company, Corvallis Division. November 1985. HP part-number 00011-90001. Archived (PDF) from the original on 2015-10-05.
Markstein, Howard W. (March 1982). "A look inside Hewlett-Packard's HP-11C". Electronic Packaging and Production Magazine.