Int 78 Fn 02  - Targa.dev - Set Dma Channel                                [d]

   AH = 02h
   AL = interface board DMA channel

Return: CF set on error
   AL = error code (see #3457)

Note:  if this routine is not called, the DMA channel is the driver's default
     (usually 3)

See Also: AH=00h,AH=03h"TARGA"