Int 20/Vx=0004h

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Microsoft Windows - VDMAD - VxD SERVICES

VxD = 0004h

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" - #01265 - #01340

(Table 01268) Values for VDMAD (VxD ID 0004h) service number: 0000h get version 0001h virtualize channel 0002h get region information 0003h set region information 0004h get virtual state 0005h set virtual state 0006h set physical state 0007h mask channel 0008h unmask channel 0009h lock DMA region 000Ah unlock DMA region 000Bh scatter lock 000Ch scatter unlock 000Dh reserve buffer space 000Eh request buffer 000Fh release buffer 0010h copy to buffer 0011h copy from buffer 0012h default handler 0013h disable translation 0014h enable translation 0015h get EISA address mode 0016h set EISA address mode 0017h unlock DMA region (ND) 0018h "VDMAD_Phys_Mask_Channel" 0019h "VDMAD_Phys_Unmask_Channel" 001Ah "VDMAD_Unvirtualize_Channel" 001Bh "VDMAD_Set_IO_Address" 001Ch "VDMAD_Get_Phys_Count" 001Dh "VDMAD_Get_Phys_Status" 001Eh "VDMAD_Get_Max_Phys_Page" 001Fh "VDMAD_Set_Channel_Callbacks" 0020h "VDMAD_Get_Virt_Count" 0021h "VDMAD_Set_Virt_Count" 0021h ...last service for Windows95 SP1

See Also: #01267 - #02646 - #02683 at INT 2F/AX=1684h/BX=0444h

Category: Windows - Int 20h - M

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