1501 INT 15 - CASSETTE - TURN OFF TAPE DRIVE'S MOTOR (PC and PCjr only)
1501 INT 15 - Amstrad PC1512 - WRITE DATA TO NON-VOLATILE RAM
1501 INT 15 - VMiX - "sys_chanreq" - I/O CHANNEL OBJECT MANAGER
1501 INT 15 - MultiDOS Plus - REQUEST RESOURCE SEMAPHORE