Ŀ
                                                                   
 AT&T PC6300 SUPPORT BBS - Bulletin Service                        
                                                                   
 SUBJECT: Low Level Format for ROM 1.43                            
 PROVIDED BY: AT&T PC-Hotline                                      
                                                                   

 
 FIRST OF ALL:
   1. A low level format will destroy everything on the hard drive.
      Are you sure you want to do this???
   2. Rom Bios 1.43 is being shipped on SOME new units.  If you still
      have 1.0, 1.1, or 1.21, be patient!  ROM 1.43 is currently NOT
      available by itself.  As soon as it is, the SYSOPS will change
      this message and post a bulletin with ordering information.
 
 The following low level routine for ROM 1.43 will NOT display or
 return messages.  The only indication that the format is working
 will be the hard drive LED.  This routine is directly programming
 the HDU Controller.  For further information, consult the SYSTEM
 PROGRAMMERS GUIDE.
 
 - Boot off the MS-DOS System Diskette
 - Once booted, insert Supplimental Diskette
 - Enter "DEBUG".  The following table represents the input and
                   output of the commands.
 
 ENTER COMMAND      RESPONSE SHOULD BE
       
 DEBUG              -
  i 321             CO
                    -
  o 322 0           -
  i 321             CD
                    -
  o 320 04          -
  o 320 00          -
  o 320 00          -
  o 320 00          -
  o 320 03          -
  o 320 07          -
 
 At this point, the drive activity LED should come on, and the
 drive will begin to format.  When the process is complete, the
 LED will go out.
 Now reboot from the MS-DOS System Diskette and proceed with
 FDISK and FORMAT.
 
 
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