Read-Write Variables (IGDACERW)

Table 1 shows the parameter list for read-write variables that is mapped by the IGDACERW macro.

Table 1. Read-Write Variables Parameter List (IGDACERW)
Offset	Length or Bit Pattern	Name	Description
0 (X'0')	1172	ACERW	Read-write variables parameter list
0 (X'0')	8	ACERWID	Control block ID contains the value "ACERW"
8 (X'8')	2	ACERWLEN	Length of control block
10 (X'A')		ACERWVER	Control block version
2	0	ACERWV	Version number (0)
12 (X'C')	4	ACERWNCS	Number of class selection return variables that follow (up to 15)
16 (X'10')	32	ACERWCSV	First class selection variable returned
16 (X'10')	2	ACERWVLN	Length of first value
18 (X'12')	30	ACERWVAL	Value of first returned variable
48 (X'30')	448		Up to 14 more class selection return variables
496 (X'1F0')	2		Reserved
498 (X'1F2')	2	ACERWNMG	Number of messages that follow (up to 6)
500 (X'1F4')	660	ACERWMSG	Area for up to 6 messages generated by execution of ACS routine write statements
500 (X'1F4')	110	ACERWTXT	Text of first message
1160 (X'488')	12		Reserved