Toshiba IHC-8000

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: Alphanumeric display  
New price:   Display color: Black  
    Display technology: Liquid crystal display 
Size: 3½"×8"×1" Display size: 24 characters
Weight: 14 oz    
    Entry method: BASIC expressions 
Batteries: 4×"AA" alkaline Advanced functions: Trig Exp Cmem Snd 
External power: 4.5VDC   Memory functions:  
I/O: Docking station     
    Programming model: BASIC 
Precision: 12 digits Program functions: Jump Cond Subr Lbl Ind  
Memories: 3(0) kilobytes Program display: Text display  
Program memory: 3 kilobytes Program editing: Text editor  
Chipset: T6808 (proprietary)   Forensic result: 9.0000278593  

ihc8000.jpg (43386 bytes)A handheld computer, the IHC-8000 was Toshiba's entry into that once promising market of HHCs, or Hand Held Computers. On its bezel, the IHC-8000 is proudly described as an "intelligent hand-held computer", and it is indeed more intelligent than most HHCs of its era: for one thing, it has a decent BASIC interpreter built-in. For another, it does not use those dreaded NiCd internal batteries that make so little sense for a low-power CMOS device. Three AA batteries, that's the way to go!

My programming example for the IHC-8000 is yet another implementation of the Gamma function, this time using Stirling's formula:

20 S=SGN(Z)
30 X=ABS(Z)
40 G=1
50 IF X>5 THEN 90
60 G=G*X
70 X=X+1
80 GOTO 50
90 G=X*LN(X)-X+LN(2*PI/X)/2-LN(G)
100 G=G+((((1/99/X/X-1/140)/X/X+1/105)/X/X-1/30)/X/X+1)/X/12
110 IF S>0 THEN 140
130 G=LN(-PI/Z/SIN(PI*Z))-G