Int 4B Fn 8102  - Virtual Dma Specification (vds) - Get Version            [d]

   AX = 8102h
   DX = 0000h

Return: CF clear if successful
       AH = major version number
       AL = minor version number
       BX = product number (see #2888)
       CX = product revision number
       always 0000h for QMAPS and HPMM.SYS
       always 0001h for Microsoft's EMM386.EXE v4.20-4.41
       DX = flags (see #2890)
       SI:DI = maximum DMA buffer size
   CF set on error
       AL = error code (see #2889)

Note:  bit 5 of 0040h:007Bh is supposed to be set if VDS is supported; this is
     apparently not always the case

See Also: INT 2C/AX=002Bh,INT 31/AX=0400h,MEM 0040h:007Bh"4Bh"
Index: installation check;Virtual DMA Specification

(Table 2888)
Values for VDS product number:
 0000h for Quadtel's QMAPS and Hewlett-Packard's HPMM.SYS
 0001h for Microsoft's EMM386.EXE
 0003h for Windows 3.x WIN386.EXE
 0300h OS/2 (all versions to date)
 0EDCh for DR DOS 6.0 EMM386.SYS
 4560h ("E`") for Qualitas' 386MAX
 4D43h ("MC") for V Communications' Memory Commander
 5145h ("QE") for Quarterdeck's QEMM-386
 524Dh ("RM") for Helix's Netroom RM386

(Table 2889)
Values for VDS error code:
 01h   region not in contiguous memory
 02h   region crossed a physical alignment boundary
 03h   unable to lock pages
 04h   no buffer available
 05h   region too large for buffer
 06h   buffer currently in use
 07h   invalid memory region
 08h   region was not locked
 09h   number of physical pages greater than table length
 0Ah   invalid buffer ID
 0Bh   copy out of buffer range
 0Ch   invalid DMA channel number
 0Dh   disable count overflow
 0Eh   disable count underflow
 0Fh   function not supported
 10h   reserved flag bits set in DX

Bitfields for VDS flags:
Bit(s) Description (Table 2890)
 0 PC/XT bus (DMA in first megabyte only)
 1 physical buffer/remap region in first megabyte
 2 automatic remap enabled
 3 all memory is physically contiguous
 4-15  reserved (zero)