Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

                                                     ◄Up► ◄Next► ◄Previous►
────────────────────────────────────────────────────────────────────────────
 
include vdmad.inc
 
VxDcall VDMAD_Get_EISA_Adr_Mode
 
The VDMAD_Get_EISA_Adr_Mode service returns the EISA extended mode.
 
Parameter  Description
────────────────────────────────────────────────────────────────────────────
 
EAX        Specifies the channel number. It must be in the range 0 to 7.
 
EBX        Specifies the DMA handle.
 
Return Value
 
The CL register contains one of the following values:
 
Value  Meaning
────────────────────────────────────────────────────────────────────────────
0      8-bit I/O, with count in bytes
 
1      16-bit I/O, with count in words and adr shifted
 
2      32-bit I/O, with count in bytes
 
3      16-bit I/O, with count in bytes
 
Comments
 
The hardware does not allow for reading the extended mode for a channel, so
VDMAD defaults to the ISA defaults (channels 0-3 are byte channels and 5-7
are word channels with word addresses and counts). An SYSTEM.INI setting can
specify an alternate setting.
 
Uses
 
ECX, Flags
 
                                      ♦