Assembling under z/OS

The minimum amount of virtual storage required by High Level Assembler is 610K bytes. 410K bytes of storage are required for High Level Assembler load modules. The rest of the storage allocated to the assembler is used for assembler working storage.

At assembly time, and during subsequent link-editing, High Level Assembler requires associated devices for the following types of input and output:

Source program input
Options file
Printed listing
Object module in relocatable card-image format, or the new object-file format
Terminal output
ADATA output

Table 1 shows the DDNAME and allowed device types associated with a particular class of assembler input or output:

Table 1. Assembler input/output devices (z/OS)
Function	DDNAME	Device type	When required
Input	SYSIN	DASDMagnetic tapeCard reader	Always(1).
Macro library	SYSLIB	DASD	When a library macro is called or a COPY statement used(1).
Options file	ASMAOPT	DASD	When assembler options are to be provided via an external file
Print	SYSPRINT	DASDMagnetic tapePrinter	When the LIST assembler option is specified(1).
Output to linkage editor	SYSLIN	DASDMagnetic tape	When the OBJECT assembler option or the XOBJECT assembler option is specified(1).
Output to linkage editor (card deck)	SYSPUNCH	DASDMagnetic tapeCard punch	When the DECK assembler option is specified(1).
Display	SYSTERM	DASDMagnetic tapeTerminalPrinter	When the TERM assembler option is specified(1).
Assembler language program data	SYSADATA	DASDMagnetic tape	When the ADATA assembler option is specified(1).
Note: You can specify a user-supplied exit in place of this device. For more information about the EXIT option, see Assembler options.