Appendix A – 89
The following CONFIG.SYS entries allow the
user to access part of the memory normally
used by the computer for executing programs
as a RAM disk. This RAM disk is initialized
whenever the system is reset. For some DOS
systems, this is often called a virtual drive.
The default size for this drive is 128K. The
size can be modified.
DEVICE=MEMDRIVE.SYS BASE nnn
Base memory (allocates nnnK)
DEVICE=MEMDRIVE.SYS BASE nnn /NOIFEMS
Base memory (allocates nnnK) but only on
systems with less than 1 MB
The /NOIFEMS switch is optional. If it is
included on 2 MB systems, the virtual drive
will not be available. For 512K systems, the
virtual drive is always available. These
drives are always formatted on reset. Once
the virtual drive is defined, it can be accessed
as any other disk.
At boot–up, if the virtual drive is specified,
the following message displays:
4010 MEMDRIVE.SYS V1.2 formatting
(136KB) drive in DOS memory as drive D:
The following CONFIG.SYS entries allow the
user to access EMS memory. This is the
memory above the 640K DOS memory limit.
DEVICE=MEMDRIVE.SYS EMS
All extended memory as a drive
DEVICE=MEMDRIVE.SYS EMS mmm sss
Extended memory as a drive of size
mmmK. Starting address at 16K page #
sss.
sss: 0 = start addr. 1MB
sss: 1 = start addr. 1MB+16K
sss: 2 = start addr. 1MB+32K
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