VIRTDMA

Purpose:    Defines the server ability to support the virtual DMA service.

Syntax:     VIRTDMA = <ON|OFF>
By default: VIRTDMA = OFF

Note:
     By default, the system intercepts the interrupt 13h (disk I/O) and
executes I/O to the high memory - A:000:000 and above, by using an internal
driver located in the lower memory. If the UMB supports the virtual DMA
service, a condition almost always fulfilled, then specifying VIRTDMA=ON
makes I/O to higher memory run faster, e.g. when loading a program using
the INSTALLHIGH command. This is also recommended for usage with a
UMB-server that operates on hardware level by reprogramming the chipset, for
example, LASTBYTE.