Dos - Symbol PDT 3200 Technical Reference Manual

PDT 3200 Technical Reference Guide
Command
Type
Purpose
ROM-DOS can be loaded in special memory, called the high-memory area, or
HMA, freeing more of the conventional (lower 640K) DOS memory for use by
applications.
Syntax
DOS=HIGH
Remarks
The DOS=HIGH command frees up more of the standard DOS memory for use by
applications.
This command will only work on 286, 386, and 486 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.
The DOS=HIGH command will also work on Chips and Technology's PC/Chip, if
it has extended memory and Chips and Technology's HIDOS.SYS device driver, or
another memory driver, is loaded.
See the HIMEM.SYS device driver description in this manual. See also 386MAX by
Qualitas for more information.
Example
The following example 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 Þrst, before DOS=HIGH.
DEVICE=HIMEM.SYS
DOS=HIGH
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DOS

CONFIG.SYS