=

AST RESEARCH, INC.        TECHNICAL BULLETIN # 1344                12-13-95

=


	    Samsung 1.2 GIG IDE Hard Drives and IDE CD-ROM Drives


PROBLEM

When replacing a 1.2 GIG IDE hard drive (HD) with a Samsung brand 1.2 GIG IDE 
HD, the system no longer sees the IDE CD-ROM.  When jumpered as single, 
the drive works fine.


CAUSE

Compatibility with the IDE controller on the system board. The IDE controller 
on the Main Logic Board is the determining factor in which jumper setting 
should be used.


SOLUTION

The Samsung drive is shipped from AST's warehouse jumpered as a MASTER and a 
spare jumper on the dead connectors.  See diagram below for Factory Defaults.  


	       Factory Default    Adjusted
		
		  X X  Jumper     X X 
		  X X             X X 
		  X X             X X 
	 CSEL     X X             X X
	 DXX      X X             X X
	 DCF      X X             X X
	 DSP      X X             X X Jumper
	 C/D      X X Jumper      X X Jumper

If, upon installing the Samsung IDE HD, the IDE CD-ROM cannot be seen, 
simply move the spare jumper to the DSP position on the HD. (See diagram 
above for Adjusted).  


SYSTEMS AFFECTED
AST PART NUMBER AND DESCRIPTION

501695-XXX      Advantage! 6075P
501696-XXX      Advantage! 8075P
501697-XXX      Advantage! 8090P
501713-XXX      Advantage! 6060P
501543-XXX      Advantage! 6060P
501544-XXX      Advantage! 6060P
501545-XXX      Advantage! 8060P
501546-XXX      Advantage! 8090P