INT 13h, 00h (00)       Reset Fixed Disk/Diskette System                 all
 INT 13h, 01h (1)        Get Disk System Status                           all
 INT 13h, 02h (2)        Read Sectors into Memory                         all
 INT 13h, 03h (3)        Write Sectors from Memory                        all
 INT 13h, 04h (4)        Verify Sectors                                   all
 INT 13h, 05h (5)        Format Cylinder                                  all
 INT 13h, 06h (6)        Format Track and Set Bad Sector Flags     fixed disk
 INT 13h, 07h (7)        Format Disk Starting at Cylinder          fixed disk
 INT 13h, 08h (8)        Get Current Drive Parameters                   fixed
 INT 13h, 09h (9)        Initialize Fixed Disk Tables              fixed disk
 INT 13h, 0Ah (10)       Read Long                                diagnostics
 INT 13h, 0Bh (11)       Write Long                               diagnostics
 INT 13h, 0Ch (12)       Seek to Cylinder                          fixed disk
 INT 13h, 0Dh (13)       Alternate Disk Reset                      fixed disk
 INT 13h, 0Eh (14)       Reserved for Diagnostics                  fixed disk
 INT 13h, 0Fh (15)       Reserved for Diagnostics                  fixed disk
 INT 13h, 10h (16)       Test for Drive Ready                      fixed disk
 INT 13h, 11h (17)       Recalibrate Drive                         fixed disk
 INT 13h, 12h (18)       Reserved for Diagnostics                 diagnostics
 INT 13h, 13h (19)       Reserved for Diagnostics                 diagnostics
 INT 13h, 14h (20)       Reserved for Diagnostics                 diagnostics
 INT 13h, 15h (21)       Read DASD Type                                  many
 INT 13h, 16h (22)       Change Line Status                              many
 INT 13h, 17h (23)       Set DASD Type for Format                        many
 INT 13h, 18h (24)       Set Media Type for Format                       many