Assembling under VM/CMS

High Level Assembler runs under the Conversational Monitor System (CMS) component of z/VM, and, depending upon system requirements, requires a virtual machine size of at least 1800K bytes.

A minimum of 610K bytes of storage is required by High Level Assembler. 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 object module processing, 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
Terminal output
ADATA output

Table 1 shows the characteristics of each device required at assembly time:

Table 1. Assembler input/output devices (CMS)
Function	DDNAME	Default file type	Device type	When required
Input	SYSIN	ASSEMBLE	DASD Magnetic tape Card reader	Always(1).
Macro library	SYSLIB	MACLIB	DASD	When a library macro is called or a COPY statement used(1).
Options file	ASMAOPT	User defined	DASD	When assembler options are to be provided via an external file
Print	SYSPRINT	LISTING	DASD Magnetic tape Printer	When the LIST assembler option is specified
Object module	SYSLIN	TEXT	DASD Magnetic tape Card punch	When the OBJECT assembler option is specified(1).
Text deck	SYSPUNCH	N/A	DASD Magnetic tape Card punch	When the DECK assembler option is specified(1).
Display	SYSTERM	N/A	DASD Magnetic tape TerminalPrinter	When the TERM assembler option is specified(1).
Assembler language program data	SYSADATA	SYSADATA	DASD Magnetic 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.