Privileg LC-814PR

Datasheet legend
Ab/c: Fractions calculation
AC: Alternating current
BaseN: Number base calculations
Card: Magnetic card storage
Cmem: Continuous memory
Cond: Conditional execution
Const: Scientific constants
Cplx: Complex number arithmetic
DC: Direct current
Eqlib: Equation library
Exp: Exponential/logarithmic functions
Fin: Financial functions
Grph: Graphing capability
Hyp: Hyperbolic functions
Ind: Indirect addressing
Intg: Numerical integration
Jump: Unconditional jump (GOTO)
Lbl: Program labels
LCD: Liquid Crystal Display
LED: Light-Emitting Diode
Li-ion: Lithium-ion rechargeable battery
Lreg: Linear regression (2-variable statistics)
mA: Milliamperes of current
Mtrx: Matrix support
NiCd: Nickel-Cadmium rechargeable battery
NiMH: Nickel-metal-hydrite rechargeable battery
Prnt: Printer
RTC: Real-time clock
Sdev: Standard deviation (1-variable statistics)
Solv: Equation solver
Subr: Subroutine call capability
Symb: Symbolic computing
Tape: Magnetic tape storage
Trig: Trigonometric functions
Units: Unit conversions
VAC: Volts AC
VDC: Volts DC
Years of production:   Display type: Numeric display  
New price:   Display color: Black  
    Display technology: Liquid crystal display 
Size: 5"×3"×1" Display size: 10(8+2) digits
Weight: 5 oz    
    Entry method: Algebraic with precedence 
Batteries: 2×"AA" alkaline Advanced functions: Trig Exp Hyp Lreg Cmem BaseN Units 
External power:   Memory functions:
I/O:      
    Programming model: Partially merged keystroke 
Precision: 11 digits Program functions: Jump Cond  
Memories: 7 numbers Program display:  
Program memory: 45 program steps Program editing:  
Chipset: Canon   Forensic result: 9.0000278593  

lc814pr.jpg (26655 bytes)Yet another interesting Privileg programmable calculator, the LC-814PR has the same features and programming model of some other OEM calculators in my possession, such as the Citizen SR-59, the Technico PSR-98, or the Hanimex SPC 1090. Must be a popular chipset; unfortunately, I don't know what chipset it is, since the chip inside this calculator is unmarked. But I suspect that it is made by Toshiba, because its programming model is very similar to chipsets that are known to be Toshiba-made.

The programming model is not terribly efficient, but not completely useless either. The calculator does have conditional branching capability; its biggest drawback is the fact that jumps are limited to within nine steps of the current program location. This is demonstrated by the following program, which computes the logarithm of the Gamma function using Stirling's approximation and a simple iteration for small or negative arguments to ensure 5+ digits of precision:

MS
1
STO
1
9
x<=M 6
RCL
1
×
RM
=
GOTO 2
GOTO 6
GOTO -9
STO
1
1
M+
GOTO -5
MR
×
ln
-
MR
+
(
2
×
π 
÷
MR
)
√ 
ln
+
1
2
1/x
÷
MR
-
RCL
1
ln
=