Customizing the BS2000 Control System

A hardware-dependent standard EXEC is supplied with BS2000 OSD/BC.

Changing the size of the virtual address space

In the standard EXEC of the BS2000 operating system the size of the virtual address space is pregenerated with 1808 MB of user address space. This results in 240 MB of system address space (SYSSIZE). The following procedure is supplied for adjusting this value:

SYSPRC.BS2000-EXEC.<ver>

Before the SYSPRC.BS2000-EXEC.<ver> procedure is called, the standard EXEC SYSPRG.BS2.<ver> must be copied to SYSPRG.BS2.<ver>.STD or renamed.
SYSPRG.BS2.<ver>.STD is the input file for the procedure.

The following SYSSIZE values can be set using the procedure. The procedure can also be used to change the program name of the standard EXEC.

Address space	MB 1	MB	MB	MB	MB	MB
System address space set (<syssize>)	128	240	256	and so on, in steps of 16 MB	496	512
Resulting user address space	896	1808	1792	and so on, in steps of -16 MB	1552	1536
Resulting address space	1024	2048	2048	2048	2048	2048

¹ If necessary, input values are rounded up to a multiple of 16 MB

The name of the output file is: SYSPRG.BS2.<ver>.STD[.<syssize>][.<program_name>].
This output file must be renamed SYSPRG.BS2.<ver>, or its name must be specified in the BS2000 parameter file.

A specific EXEC generated by the procedure cannot be used as the input file for another procedure run.

So that the procedure can change the address space, the standard EXEC supplied contains additional modules that are not required for the actual execution of BS2000. These modules are not adopted when the modified EXEC is created, which is why the file with the newly created EXEC is approx. 25% smaller than the standard EXEC.