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                    TWO HARD DISK CONTROLLERS

     It  is possible to install two PS180 8 bit Controllers in XT 
or AT systems.  Necessary equipment includes the XT9-1.05 or AT9-
1.07  BIOS  (depending  on which system  you  have),  the  latest 
revision of the Perstor low-level formatting software,  Ontrack's 
Disk   Manager  partitioning  software,   and  two  PS180  8  bit 
Controllers.

     The  primary (boot) controller requires no modification  and 
has  a  port address of 320 hex.  Two hard disk  drives  must  be 
attached   to  this  controller.    The  secondary  (co-resident) 
controller  must  be modified to utilize port  address  324  hex.  
This can be done by cutting the trace between pin set 1-2 of JMP5 
on  the  solder  side of the board.   Call your  dealer  for  any 
questions on this procedure.

     Next, connect the drive(s) to the respective controllers and 
proceed with the PS2FMT low-level format program.  Following this 
step,  you  must  use  Disk Manager to partition  and  high-level 
format all disk drives.   
