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4-28 ROM-DOS Internal Commands
DOS
CONFIG.SYS Command
ROM-DOS can be loaded into an upper portion of memory referred to as
the High Memory Area (HMA), freeing more of conventional (lower
640KB) DOS memory for use by applications.
Syntax
DOS=[HIGH | LOW]
Remarks
The DOS=HIGH command frees up more of the standard DOS memory for
use by applications.
This command only works on 286 and higher CPUs with extended
memory and Datalight’s HIMEM.SYS High Memory Manager, or
equivalent, installed. It will not work on standard XT class PCs. Setting
DOS=HIGH is ignored when ROM-DOS is in ROM.
Example
DEVICE=HIMEM.SYS
DOS=HIGH
Loads the high memory area device driver and then loads ROM-DOS into
the HMA for increased conventional memory. The high-memory-area
device driver must be loaded first, before DOS=HIGH.