MS>
  > DosQuerySysInfo returns to total physical memory size. But
  > this is >= addressable memory.
  >
  > eq: on a 32MB ISA machine with a busmastering SCSI adapter
  > only 16MB is addressable. but DosQuerySysInfo returns 32MB.
  > :-(
MS>

  The ISA DMA limitations are not visible to processes, and do not
  affect their address space at all.  So there is not much point in
  providing such information to them.

  However, there obviously is a means of determining whether ISA DMA
  limitations apply to a device, since the System Information Tool can
  determine this.  The way to do it turns out to be to query the device
  to determine whether it supports addressing above the 16Mb line using
  DosDevIOCtl category 8 function 0x63 (query device attributes) and to
  inspect the flag in the returned data buffer.

  > JdeBP <
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