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Working with S5-DOS/ST
C79000-G8576-C760-03
The conventional user memory has a standard capacity of
640 Kbytes in all PGs. Programs can use the conventional user
memory without the special commands required for other types of
memory.
MS-DOS occupies part of the conventional user memory. The
device drivers and commands specified in the CONFIG.SYS and
AUTOEXEC.BAT files take up further user memory space. The
remaining memory is available for user programs.
In addition to the conventional user memory, your PG also has a
384 Kbyte memory known as the upper memory area. This area is
immediately next to the 640 Kbytes of the conventional user
memory. This area is normally reserved for your additional
hardware, however parts of it can be made available by a memory
manager.
The high memory area (HMA) is a special 64 Kbyte field in the
additional memory located directly above the 1 Mbyte address.
Most programs use the conventional user memory. They cannot
use the extended memory because the addresses which identify the
locations of the programs in the extended memory are too high for
these programs to recognize. Only the addresses in the 640 Kbyte
area of the conventional user memory are recognized by all
programs.
You can activate more user memory in your programming device
by installing a memory manager. These programs allow access to
the extended memory and the upper memory area.
Conventional User
Memory
Upper Memory
Area
High Memory Area
Extended Memory,
XMS
User Memory Management
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