Use DMASPEED to determine whether or not a computer can support the
high DMA transfer rate required for use with DiskDupe and 1440 RPM drives
(4xSDS drives jumpered for 1440 RPM).

If the computer reports a speed of 1000k or greater, the computer will
most likely work.  If the speed is below that, there may be complications
or the computer may not be able to support the drive at all.

Currently we don't know the lower limit for it to work at all, but we are
hoping with enough feedback that we will. 

