SSVT mapping

Table 1. Structure SSVT
Offset
Dec		 Offset
Hex		 Type Len Name(Dim) Description
0 (0) STRUCTURE 0 SSVT  
0 (0) X'0' 0  SSVTBEGN "*"
0 (0) SIGNED 2  SSVTRSV1 RESERVED
2 (2) SIGNED 2  SSVTFNUM Maximum number of function routines supported by this vector table 
   256 BYTE FUNCTION MATRIX -
     THE SSOB FUNCTION ID MINUS ONE IS USED AS AN OFFSET INTO
     THIS MATRIX.
         MATRIX FUNCTION BYTE =0 : THE FUNCTION SPECIFIED IN THE
                                    SSOB IS NOT SUPPORTED BY THIS
                                    SUBSYSTEM.
         MATRIX FUNCTION BYTE ¬=0 : THE VALUE (FUNCTION BYTE-1) 4
                                    IS ADDED TO THE ADDRESS OF
                                    SSVTFRTN TO OBTAIN THE
                                    ADDRESS OF THE WORD CONTAINING
                                    THE FUNCTION ROUTINE POINTER FOR
                                    THIS REQUEST.
4 (4) BITSTRING 1  SSVTFCOD(0) FUNCTION MATRIX
4 (4) X'104' 0  SSVTFSIZ "*-SSVTBEGN" SSVT FIXED AREA SIZE
260 (104) SIGNED 4  SSVTFRTN SSVTFRTN IS THE FIRST WORD OF A VARIABLE LENGTH MATRIX CONTAINING FUNCTION ROUTINE POINTERS FOR FUNCTIONS SUPPORTED BY THIS SUBSYSTEM. THE MATRIX CAN BE A MAXIMUM OF 256 WORDS LONG.
1284 (504) X'504' 0  SSVTSIZE "*-SSVTBEGN" MAXIMUM SSVT SIZE