INT 78 - TARGA.DEV - CMC International SCSI device driver - SET I/O PORT
        AH = 00h
        DX = interface board I/O port
Return: CF set on error
            AL = error code (see below)
Note:   if this routine is not called, the port is the driver's default
          (usually 0280h or 0300h)
        an installation check is performed by TARGA.DEV upon initialization
          by checking for the string "SCSI" at offset 03h into the interrupt
          handler
SeeAlso: AH=01h,AH=02h
Index:  installation check;TARGA.DEV

Values for error code:
 00h    illegal command given to SCSI code
 01h    invalid I/O port specified (must be from 100H to 3F8H, and must be on
          an 8-port boundary)
 02h    invalid DMA channel specified (must be from 1 to 3)
 03h    invalid SCSI board number specified (must be from 0 to 7)
 04h    error from data register test during self-test
 05h    SCSI input signals not all 0 when SCSI RST activated
 06h    SCSI input signals not all 0 before selecting a SCSI device
 07h    BSY signal is active; SCSI bus is busy
 08h    SCSI board not selected, BSY signal did not come on in response to
          raising SEL
 09h    time-out waiting for status state, signifying end of DMA transfer

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