Opening a PAM file (OPEN modes)

The following table provides an overview of the OPEN modes.

Open mode	Brief description
INPUT	Read blocks from an existing file.
OUTIN	Create a new file and, if required, read blocks from this file.
INOUT	Read blocks from an existing file and, if required, add or exchange blocks.

Table 70: Open modes when opening a UPAM file

The table below provides information on which functions of the PAM macro are permitted in conjunction with the above-mentioned open modes.

PAM macro functions	OPEN mode
	INPUT	OUTIN	INOUT
RD, RDWT, RDEQU, LRD, LRDWT	X	X	X
WRT, WRTWT, WRTWU	-	X	X
WT, CHK, SYNC	X	X	X
LOCK, UNLOCK, SETL	X	X	X
SETLPP	-	X	X

Table 71: UPAM functions and permissible open modes