DTC Hard Disk Controllers with BIOS Located in UMA (74462)

The information in this article applies to:
    Microsoft MS-DOS operating system 5.0

This article was previously published under Q74462


The following DTC (Data Technology Corporation) hard disk controller cards use 16K of upper memory area (UMA) for their BIOS:
   RLL            ESDI             EISA
   ---            ----             ----

   7287           6000             6295
   5287i          6180
   7187i          6280
   5187i          6162-15TX
If the MS-DOS version 5.0 EMM386.EXE does not detect the BIOS region for these cards, you may experience the following symptoms:
    The system hangs when EMM386.EXE loads with the RAM option.
    The system hangs when a DEVICEHIGH statement is attempted.
    FAT is corrupted after booting with EMM386.EXE.
    The system hangs and large numbers of lost clusters are reported by CHKDSK.
All of these symptoms indicate that EMM386.EXE may be conflicting with the hard drive controller BIOS. The X= parameter should be used to exclude the hard drive controller BIOS region.

All of the cards mentioned above use two possible address ranges in the UMA. Depending on how the card is configured, one of the two following EMM386.EXE parameters should be used:

X=C800-CC00 (default setup)



The specific address range used is determined by jumpers located on the card in question. The technical documentation accompanying the card should be consulted to determine which range to exclude.

The products included here, DTC hard disk controller cards, are manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.

Modification Type: Major Last Reviewed: 11/26/1999
Keywords: KB74462