INT 6B - Tandy SCHOOLMATE PLUS - API(Application Program[ming] Interface) The defined set of calls which a program may make to interact with or request services of the operating system or environment under which it is running. Because the inputs and outputs of the calls are well-defined, a program using the API can continue using the identical calls even if the internal organization of the program providing the API changes.
AH = 6Bh
AL = E0h to FFh
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