15D100DX0000 INT 15 - later PS/2s - GET NUMBER OF DEVICE DESCRIPTOR TABLE (DDT) ENTRIES
15D101 INT 15 - later PS/2s - RETURN DEVICE DESCRIPTOR TABLE (DDT) ENTRY BY NUMBER
15D102 INT 15 - later PS/2s - RETURN DEVICE DESCRIPTOR TABLE (DDT) ENTRY BY I/O ADDRSS
15D103DX0000 INT 15 - later PS/2s - RETURN ENTIRE DDT
15D104 INT 15 - later PS/2s - RETURN DEVICE DESCRIPTOR TABLE (DDT) ENTRY BY DEVICE ID