INT 5F - HP 95LX/100LX/200LX GRAPHICS PRIMITIVES - WRITE TEXT                   
	AH = 0Fh
	AL = rotate flag (if nonzero, rotate 90 degrees counter-clockwise)
	DX,CX = row,column of first character's top left corner
	ES:DI -> ASCIZA NUL-terminated ASCII string.	The ASCIZ string "ABC" consists of the four bytes 41h, 42h, 43h, and 00h.  Unless otherwise specified, maximum lengths given in the interrupt list do not include the terminating NUL. text