.-PESTOP=NO--.   
>>-+------------+----------------------------------------------><
   '-PESTOP=YES-'   

YES

if the assembler detects errors in the invocation parameters or in any *PROCESS statements specified when the assembler is called, all such errors are reported in assembler error diagnostic messages, and the assembly terminates. Similarly, if the invocation parameters or *PROCESS statements contain any options that have a fixed installation default value (the option was specified in the DELETE option of the ASMAOPT macro), all such attempts to override a fixed installation default are reported in assembler error diagnostic messages, and the assembly terminated. See the DELETE option ontopic DELETE.

NO

the assembler reports errors in invocation parameters and in any *PROCESS statements, and continues the assembly using the installation default value for the erroneously specified option. Similarly, the assembler reports any attempts to override fixed installation defaults, and continues the assembly using the default value.

Default

PESTOP=NO