Casio PD-310

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/log 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: Li-ion rechargeable battery
Lreg: Linear regression (2-var. stats)
mA: Milliamperes of current
Mtrx: Matrix support
NiCd: Nickel-Cadmium recharg. batt.
NiMH: Nickel-metal-hydrite rech. batt.
Prnt: Printer
RTC: Real-time clock
Sdev: Standard deviation (1-var. stats)
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: Alphanumeric display  
New price:   Display color: Black  
    Display technology: Liquid crystal display 
Size: 6"×7½"×½" Display size: 12 characters
Weight: 6 oz    
    Entry method: BASIC expressions 
Batteries: 2×"CR-2032" Lithium + 1×"CR-1220" Lithium Advanced functions: Trig Exp Cmem Snd 
External power:   Memory functions:  
I/O: Casio I/O     
    Programming model: BASIC 
Precision: 12 digits Program functions: Jump Cond Subr Lbl Ind  
Memories: 16(0) kilobytes Program display: Text display  
Program memory: 16 kilobytes Program editing: Text editor  
Chipset:   Forensic result: 9.00000716758  

Casio PD-310

pb310.jpg (66537 bytes)The PD-310 is a rather unusual calculator. Its folding design is not one commonly used by Casio. The lack of a model number on the device itself suggests that it may, in fact, be from a small or prototype production run. It is also identical in function and appearance to the PD-300 except that the latter omits the right-side keyboard panel: hence, it is not programmable, and unless you download programs to it, it is usable only as a 4-function calculator.

Download programs? Well, yes. The PD-310 appears to be nothing less than a programming system for the PD-300. The machines are also compatible with the FP-40 personal printer which, in turn, has connectors for an external cassette recorder where programs can be saved.

But, back to the PD-310. It has an unusually large amount of memory for calculators of its kind: a whopping 16 kilobytes! The programming model is typical Casio, no surprises there. To demonstrate, here's a version of my favorite programming example, the Gamma function: 

10 INPUT X
20 G=1
30 IF X>5 THEN 70
40 G=G*X
50 X=X+1
60 GOTO 30
70 G=X*LOGX-X+LOG(SQR(2*π/X)/G)
80 G=G+((((1/99/X/X-1/140)/X/X+1/105)/X/X-1/30)/X/X+1)/12/X
90 PRINT G,EXPG