INT 49 - TI Professional PCIBM PC - CRT - PRINT TTY STRING
	AH = 18h
	CS:BX -> counted string (count byte with length followed by string)
Return: nothing
Notes:	AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
	the string must be located in the caller's code segment; any TSRs
	  which want to hook INT 49 must check for this function and emulate
	  it, because the BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware.  The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. retrieves the caller's CS from the stack
SeeAlso: AH=01h,AH=02h,AH=0Eh