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Programmable calculators Casio PB-100
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Datasheet Years of production: 1982  Display type: Alphanumeric display  
New price:   Display color: Black  
    Display technology: Liquid crystal display 
Size: 3"×6½"×½" Display size: 12 characters
Weight: 4 oz    
    Entry method: BASIC expressions 
Batteries: 2×"CR-2032" Lithium Advanced functions: Trig Exp Cmem Snd 
External power:   Memory functions:  
I/O: Casio I/O, Expansion port     
    Programming model: BASIC 
Precision: 12 digits Program functions: Jump Cond Subr Lbl Ind  
Memories: 26(0) numbers Program display: Text display  
Program memory: 544 bytes Program editing: Text editor  
Chipset:   Forensic result:  

pb100.jpg (28559 bytes)One of the simplest Casio BASIC programmable calculators ever made, the PB-100 is a close relative of the FX-700P.

The PB-100's programming model is demonstrated here by my favorite 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*LN X-X+LN (SQR (2*pi/X)/G)
80 PRINT G+((((1/99/X/X-1/140)/X/X+1/105)/X/X-1/30)/X/X+1)/12/X