Texas Instruments 4000M - Manual (Page 171)

RAM DRIVE.SYS Device Driv er
Note: When you turn off or warm start your computer, all
data stored in
RAM disks is lost (for DOS versions earlier
than 6.0).
The RAMDRIVE.SYS device driver enables your computer to
use some of its memory as if it were a hard disk drive.
Called a
RAM disk (and sometimes a virtual disk), it is much
faster than a hard disk because its data is always loaded
into
RAM . RAMDRIVE.SYS puts the RAM disks into the
memory area above 1 MB.
Note: Using the RAMDRIVE.SYS device driver increases the
size of MS-DOS resident in memory.
Install and use this device driver as described in the
Microsoft MS-DOS User’s Guide and Reference.
RAMDRIVE.SYS Device Driver
9-6 Other Utilities