CALC is a program that mimics a simple algebraic calculator
on a VT100 type terminal.
	It draws a picture of the calculator on the screen and uses
the keypad for input.

	To build, type @CALC.BLD

	NBS this builds two libraries, STRING and DAYLIB.
 
	    also you need SF.SMC/GMC and IO.GTS sysgened into your system and
	    the terminal type must be a VT100, or therabouts ie SET /VT100=TI:.
	    If DEC adds support for VT2?? terminal edit KEYPAD.MAC table to add
	    bit pattern for same.