IBM Mainframe Forum

Hi All,

this is my first time to code assmbler program. I want to transfer a assmbler program from pc370 to mainframe/mvs.
My comiler JCL told me it didn't recoganize these instruction. such as" WTO, BEGIN, RETURN" etc. finally, I found they
are macro instruction. the docment told me should put all macro into Source Library. could anybody tell me which source
I should put these macros in?

thanks,
Helen

Hi Helen,

There should be standard assembler jcl on the mainframe you are using. This standard jcl should already name the needed "macro library". Suggest you talk with someone who supports the assemble/link process and learn the name of the standard assembler process on that system.

Also, many organizations do not allow developers to issue WTO commands. You may want/need to change the code to write the data to a file rather than issuing WTO. . .

System macros such as SAVE, OPEN, CLOSE... etc are located in SYS1.MACLIB
This library is usually pointed to by the SYSLIB DD card i.e. //SYSLIB DD DSN=SYS1.MACLIB,DISP=SHR in the assembler procedures which are normally maintained in SYS1.MACLIB
Other macro libraries can be concatenated behind SYS1.MACLIB and any macros which you, yourself, may code should be stored there
// EXEC ASMFCL
//ASM.SYSLIB DD
// DD DSN=USER1.MACLIB,DISP=SHR
It is usual practice to limit access to SYS1.MACLIB as 'Read Only' to all except those handling the maintenance of the system

Until you know your macro does not have any errors, put it in-line in your source before the first time it's used. It's much easier to correct problems this way. After your macro works correctly, then put it in a library that you put in the SYSLIB concatenation for the Assembler.