Upgrading Toshiba T1000 Laptop to MS-DOS 5.0 and later (75226)

The information in this article applies to:
    Microsoft MS-DOS operating system 5.0
    Microsoft MS-DOS operating system 5.0a
    Microsoft MS-DOS operating system 6.0
    Microsoft MS-DOS operating system 6.2
    Microsoft MS-DOS operating system 6.21
    Microsoft MS-DOS operating system 6.22

This article was previously published under Q75226


The Toshiba T1000 laptop uses ROM DOS Toshiba MS-DOS version 2.11, which is configured as a 256K read-only drive C. At this time, there is no ROM DOS upgrade available from Toshiba.

You can use Microsoft MS-DOS 5.0 or later with the Toshiba T1000 laptop. The T1000 boots from a MS-DOS 5.0 or later system floppy disk. However, you will be unable to access the ROM DOS drive C. The HARD RAM drive D or the RAM expanded memory (which is the same thing, just configured differently) is accessible if you do ONE of the following:

    Run FDISK. From fixed disk drive 2, delete the two non-DOS partitions and the Novell partition, then create a primary DOS partition. Format drive C.

    The HARD RAM drive will now be usable as drive C. -or-

    Boot on the ROM DOS. Copy the file EMM.SYS to the MS-DOS 5.0 system disk. Run the T1000 SETUP10.EXE program and configure the HARD RAM drive so that there is at least 64K bytes not used. On the MS-DOS 5.0 system disk, include MS-DOS 5.0's RAMDRIVE.SYS and a CONFIG.SYS file that contains at least the following:
          device=ramdrive.sys /a
    The HARD RAM drive will now be accessible as a normal RAM drive.


The T1000 will NOT boot from the HARD RAM drive using MS-DOS 5.0 or later.

The Toshiba T1000 laptop should not be confused with the Toshiba T1000 desktop.

The specifications for the Toshiba T1000 laptop are as follows:
   CPU:              80C88 4.77 MHz
   Operating system: MS-DOS 2.11 in 256K ROM
   Drives:           One 720K 3.5-inch drive
   Memory:           512K RAM
                     Optional 768K LIM EMS 3.2 memory card available
   Keyboard:         82 key
   Display:          CGA-compatible LCD


The product included here is manufactured by Toshiba, a vendor independent of Microsoft; we make no warranty, implied or otherwise, regarding this product's performance or reliability.

Modification Type: Major Last Reviewed: 5/12/2003
Keywords: KB75226