REM For what it's worth, frequently used conversions can be LOADed REM into the calculator as a little compiled OPL (OPO) program: REM e.g... PROC cm2in:(cm) REM Centimeters to inches RETURN cm/2.54 ENDP PROC in2cm:(in) REM viceversa RETURN in*2.54 ENDP PROC cen2far:(ce) REM centigrade to farenheit RETURN (ce*9/5)+32 ENDP PROC far2cen:(fa) REM viceversa RETURN (fa-32)*5/9 ENDP PROC lb2kg:(lb) REM pounds to kg RETURN lb*0.454 ENDP PROC kg2lb:(kg) REM viceversa RETURN kg*2.205 ENDP PROC ga2li:(ga) REM gall to litres RETURN ga*4546 ENDP PROC li2ga:(li) REM litres to gall RETURN li*0.220 ENDP PROC h2m:(h,m) REM Hours to mins (! see below) RETURN 60*h+m ENDP PROC m2h:(m) REM Mins to hours (! see below) LOCAL h,i h=INT(m/60) i=INT(m-h*60) RETURN (h*100+i)/100 ENDP PROC et:(onh,onm,offh,offm) REM Hours+mins between two times LOCAL ton,toff REM useful when programming a ton = h2m:(onh,onm) REM video!! toff = h2m:(offh,offm) REM RETURN m2h:(toff-ton) ENDP REM Use: At the calculator, load CALC.OPL then use the routines REM byt typing (e.g. cm->ins) cm2in:(56+2-45) REM converts 13 cm to inches etc... REM