FVSECT ,
158 VFRET JSRO 160 JSR1 R1UHD 168 F800 170 FVSDSKI DSKLOC 178 RWCNT DSKIDR 180 ADTADD
188 FINISLST
198 lAO FFE FFD lA8 //////1 1*5 1*6 I 1*7 1BO lB8 1CO lC8 1DO 1D8 1EO lE8 FVSFSTM FVSER1Sl REIDCNT FVSFSTDT FVSFSTIC FVSFSTIL FVSFSTID FFF
SIGNAL A*3 I 1*4 FVSER1S0 FVSERlS2 1/////////////////////////// FVSFSTN FVSFSTT FVSFSTRP FVSFSTCL 1*8 I 1*9 FVSFSTYR FVSFSTAC 192 IBM VM/370 Data Areas and Control Block Logic

Eexadecimal
Displacement
----------- 0 3C 78 CO C8 104 107 10a 144
147
148 14C 150 154
158 15C 160 164 168 16C 170 174
i74
178 17C 180 184 18C 194 19C 19E
19E 1AO 1A2
Field
Name
DISK$SEG DS REGSAV3 DS RWFSTRG DS ADTFVS DC REGSAVO DS DC ERRCODO DC TRKLSAVE EQU REGSAV1 DS DC ERRCOD1 DC F65535 DC FW4 DC HW4 VFREE Fl00 VFRET JSRO JSR 1 EQU DC DC DC DC DC RiHFD DC FaOO DC DC FVSDSKA DC DSKLST DS DSKLOC DS RWCNT DC DSKADR DC ADTADD DC FINISLST DC FFF
FFE
FFD DC DC DC DS DC DC DC 15F
15F
1aF 2F'0' 15F
AL3 (00) AL 1 (*-*) REGSAVO 15F
AL3 (00) AL 1 (*-*)
F'65535'
F'4' FW4+2 V (FREE) F'100' V (FRET) F'O' F'O' i (*-*j F'aOO' A (HW4) A (*-*) OF A (*-*j A (*-*)
A (*-*)
A (*-*) CLa'FINIS' CL8'*' CL8'*' CL2'*' OH X'FFFF' X'FFFE' X'FFFD' FVSECT Field Description, Contents, For FSTLKP, FSTLKW, ACTLKP, TBKIKP, CQTRK For RtEUF, WRBUF, FINIS, FOINT Remaining storage for RDEUF, WREUF, FINIS
ADTLKP
Saved RO-R15 First 3 bytes of return code
A*1 Error code
For only when called by QQTRK/X Register save area
First 3 bytes of return code
A*2 Error code
= X'COOOFFFF' Constant value Constant value Constant value Constant value
Address of FRET (into R15) RO saved here for FRET calls
R1 saved here for FRET calls Address of l!FD 800 l:ytes Address of the active disk table
All-purpose RDTK/WRTK Address of item to read or written Byte count (usually 800) Disk address of item to l:e read or written
Address of active disk table now in use to close all files
Halfword constants Means no significant data Fast 215th byte
1968-era still supported on input only
Newest signal for 2314 handling
Section 2. CMS Iata Areas and Control Elocks 193