INT 53 - Tandy 2000 - SERIAL COMMUNICATIONS Note: this interrupt is identical to INT 14 on Tandy 2000 SeeAlso: INT 14/AH=00h"SERIAL",INT 14/AH=01h,INT 14/AH=02h,INT 14/AH=03h SeeAlso: INT 14/AH=04h"Tandy 2000",INT 52"Tandy 2000",INT 54"Tandy 2000"