INT 21 - WDTSR.COM - INSTALLATION CHECK                                         
	AH = 2Bh
	CX = 6269h ('bi')
	DX = 742Dh ('t-')
Return: AL = FFh if not installed
	AL = 77h ('w') if WDTSR is installed
	    CX = 6174h ('at')
	    DX = 6368h ('ch')
	    ES = resident code segment
	    ES:DI -> identification and configuration data
Program: WDTSR is a driver for the bitWatch watchdog hardware by bit-design
	  GmbH
SeeAlso: AH=2Bh/CX=6269h"bitFOSSI",INT 14/AH=14h"FOSSIL(Fido/Opus/Seadog Standard Interface Layer)  A standardized API for performing serial I/O, originally used by the Fido and Opus bulletin- board software and Seadog bulletin-board mailer, but now in wider use.",INT 15/AH=C3h