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AST RESEARCH, INC.          TECHNICAL BULLETIN # 1478               4-5-96

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	  Bravo LC/MS/MS-T: DOS does not Recognize an IDE Hard Drive  
			on the Secondary IDE Controller


PROBLEM

When a hard disk drive and CD-ROM drive are installed on the primary 
channel in a Bravo system, DOS may not recognize the second hard disk 
drive, if attached to the secondary IDE channel.


CAUSE

The Bravo system board was designed with a single First In First Out (FIFO)
buffer for the IDE controller.


SOLUTION

Install both hard disk drives on the primary IDE channel, as master and slave, 
and the CD-ROM drive as master on the secondary IDE channel. 
The CD-ROM drive must be the last drive in the chain.


SYSTEMS AFFECTED
AST Part Number and Description

501772-XXX      Bravo MS P/75
501774-XXX      Bravo MS P/100
501814-XXX      Bravo MS P/120
501815-XXX      Bravo MS P/133
501777-XXX      Bravo MS-T P/100
501860-XXX      Bravo MS-T P/133
501749-XXX      Bravo LC P/100