Siemens SIMATIC S5 Series Manual page 24

User Memory Management
3
3-2
In the MS-DOS environment, the most important system resources
are the user memory and the storage space on a hard disk or
diskette. The memory configuration and management can affect
the following:
Which programs can be run
How fast programs can be run
How much data a program can work with
How much data can be stored between one working session and
the next.
The basic configuration of the user memory is on the motherboard
of your programming device. This can be extended by a memory
expansion card. All programs must be loaded in the user memory
before they can be run.
Your PG has two different types of user memory:
Conventional user memory
Extended memory.
Programs running under MS-DOS normally use the PG's
conventional memory. To allow programs to use the extended
memory, you must install a memory manager to coordinate access
to this memory.
Working with S5-DOS/ST
C79000-G8576-C760-03