1. AHA_1542.zip Driver
2. README.TXT File Contents

README.TXT Driver File Contents (AHA_1542.zip)

  File to describe usage of BUSONOFF.BAT.

  BUSONOFF.BAT is a batch file used to set the bus on and bus off time
  of the AHA-154xA or AHA-154xB. If you have an AHA-154xC, or AHA-154xCF
  use the 1542ccfg.zip from the Adaptec BBS.(C_config.exe or cfconfig.exe)

  The bus on/off times set by this program will allow tape drives (both
  floppy and/or SCSI based tape backup) to stream.  The tape drive may or
  may not be attached to the host adapter (e.g. the tape drive may be
  floppy based and may be attached to the system floppy controller).

  DOS DEBUG is required, and must be in the same <path> as BUSONOFF.BAT.
  In addition, the data file BUSONOFF must also be in the same <path>
  as the .BAT program.  BUSONOFF.BAT can be placed in the AUTOEXEC.BAT,
  so that the bus on and bus off times are set every time the system is
  booted.  Once the bus on/off times are set, they will remain set, and
  BUSONOFF.BAT does not need to be run again.

     Sample AUTOEXEC.BAT:

     PROMPT $P$G
     PATH C:\;C:\DOS;C:\WINDOWS
     TEMP=C:\WINDOWS
     BUSONOFF.BAT

	NOTE:  Make sure that the BUSONOFF data file and DOS DEBUG are in the
	       same <path> or subdirectory as BUSONOFF.BAT

 Technical Information:

  The bus on/off parameter is the amount of time the host adapter uses to
  take control of the AT bus to do direct memory access (DMA) data transfers.
  If this time is too large, it may keep tape drives from streaming, thus
  increasing the time to do backups.  The default bus on time is 11 micro-
  seconds, and the default bus off time is 4 microseconds.  DISONOFF.BAT
  will change these values to bus on time=4 microseconds and bus off time=
  12 microseconds.  Performance under DOS should not be affected, but the
  tape drive will be allowed to stream.

  Some 154x and floppy tape combinations will require a lower bus on time
  to allow the tape drive to stream. Change the bus on time setting in the
  bedug script to 02 instead of 04. This will change the bus on time to 2
  microseconds instead of 4.



  To set the bus on time back to 11 microseconds, use DOS DEBUG:

    -o 331 07        :This is the host adapter command for set bus on time
    -o 331 0B        :This sets the value to 11 microseconds
    -o 330 40        :This resets the adapter
    -q               :This quits DOS DEBUG and returns to the DOS prompt

  To set the bus off time back to 4 microseconds, use DOS DEBUG:

   -o 331 08         :This is the host adapter command for set bus off time
   -o 331 04         :This sets the value to 4 microseconds
   -o 330 40         :This resets the adapter
   -q                :This quits DOS DEBUG and returns to the DOS prompt

  Please send feedback on this utility to the Sysop of the Adaptec BBS
  (408) 945-7727.  

  Thanks.