Int 20  P - Microsoft Windows - Blockdev / Ios - Vxd Services              [W]

   VxD = 0010h

Note:  the desired VxD and service number are identified by the data
     immediately following the INT 20 instruction, as in:
       INT 20h
       DW  service number
       DW  VxD identifier

See Also: INT 2F/AX=1684h"DEVICE API",INT 30"Windows",#0961,#1032

(Table 0974)
Values for BlockDev/IOS (VxD ID 0010h) service number:
 0000h get version
 0001h register device
 0002h find INT 13 drive
 0003h get device list
 0004h send command
 0005h command complete
 0006h synchronous command
 0007h "IOS_Register"
 0008h "IOS_Requestor_Service"
 0009h "IOS_Exclusive_Access"
 000Ah "IOS_Send_Next_Command"
 000Bh "IOS_Set_Async_Time_Out"
 000Ch "IOS_Signal_Semaphore_No_Switch"
 000Dh "IOSIdleStatus"
 000Eh "IOSMapIORSToI24"
 000Fh "IOSMapIORSToI21"
 0010h "PrintLog"

See Also: #0973,#0975