Old IBM360 Syntax supported by HP for compatibility!
The format for the ASSIGN verb is(maybe was) ASSIGN name,class,recording mode,device,file-size,formsmessage,L
DA for direct access, UT for Utility UR for Unit Record
The "DA" was for "Direct Access" and that meant "non-sequential".
Example below.
000100 SELECT CUSTOMR-SALES
000110 ASSIGN TO "CUSTSL,DA,A,DISC,,10000,,"
000120 ORGANIZATION IS INDEXED
000130 ACCESS MODE IS DYNAMIC
000140 RECORD KEY IS CSR-KEY
Hope this helps.
Greg