Submit/release header record

Offsets
Dec Hex Type Len Name (Dim) Description
0 (0) STRUCTURE 20 * SU/RE HEADER RECORD KEY
0 (0) CHARACTER 20 EVTSRH SU/RE HEADER RECORD KEY
0 (0) SIGNED 4 * RECORD NUMBER = 0
4 (4) SIGNED 4 EVTLRCYC LATEST READ CYCLE NUMBER
8 (8) SIGNED 4 EVTLRREC LATEST READ RECORD NUMBER
12 (C) SIGNED 4 * MAX #RCDS EXCL HDR
16 (10) SIGNED 4 * TRACK CAPACITY IN RCDS