Page of GC20-1807-7 As Updated Apr ill, 1981 by TNL GN25-0829 V V=R machine, used with single processor
mode (5748-XEj) 102.2-102.3 VCHBLOK 53-54 VCHADD (virtual channel address) 53-54 VCHSTAT 53-54 VCHTYPE (type) 53-54 VCUBLOK 53-54 VCUADD (virtual control unit address)
53-54 VCOSTAT (status) 53-54 VCUTYPE (type) 53-54 VDEVBLOK 54-56 VDEVADD (virtual device address) 54-56 VDEVCFLG (virtual console flags) 54-56 VDEVCSW (virtual CSW) 54-56 VDEVEXTN (virtual spool extension)
54-56 VDEVFLAG (device dependent 54- 56 VDEVFLG2 (Reserve/Release fl ags) 54-56 VDEVIOB (active IOBLOK pointer) 54-56 VDEVREAL (real device block address)
54-56 VDEVRRB (address of VRRBLOK) 54-56 VDEVSFLG (virtual spooling flags) 54-56 VDEVSTA T (sta tus) 54-56
verifying existence of saved systems 202 virtual
block multiplexer channel option 102 console functions, DIAGNOSE instruction
184.1
operator's console 76
processor 76
virtual=real option 77-78,92-93,95-97
virtual console, operator 76
virtual devices, I/O 76
virtual interval timer assist 101,175-176 virtual machine assist feature
described 98-99
described (5748-XE1) 98.2
restrictions for use of 98-99
usage 98-99
used to reduce real supervisor state
time 98-99
used to reduce real time 98.2 Virtual Machine Communication Facility (VMCF) VMCF) introduction to 143 Virtual Machine Facility/370 (VM/370) CMS 231-233
control program 73-230 device types in 192-194 DIAGNOSE instruction in 182
directory 76
load environment 124-125
program states 83
R SCS 327- 342
virtual machine storage size
maximum, replacing directory entry 206- 210 replacing directory entry 206-210 v irt ual machines
abend du mp 23
abnormal termination 8-13,15-17,23
creation 76
382 IBM VM/370 System Programmer's Guide
described 76 DIAGNO SE instruction usage 182
directory 76
disabled loop 8-13,15-17
procedure 26-27
disabled wait 8-13
procedure 15-17,29-30 dispatching scheme 84-85
en abled loop 8-13,15-17
procedure 26-27
enabled wait 8-13
procedure 15-17,30 with real timer option 30 without real timer option 30 in terrupt, handled by C P 76 I/O management
dedicated devices 79-80 directory 79-80 mass storage volumes 79-80 shared devices 79-80 spooled devices 79-80 I/O operation 89-90 operating system 76
pe rformance
for time-shared multi-batch machines
126
options 93 PSW 83
shared segment operation 142
storage management
directory 76-77
virtual storage 76-77
time management
conversational user 76
nonconversational user 76
priority of execution 76
timers 175-176
unexpected results 8-13,15-17
procedure 24-25 Virtual Reserve/Release support, virtual
machine I/O management 79-80 virtual storage 76
management
CP 76-77 RSCS 335
virtual storage preservation
purpose of (5748-XE1) 78..1 SAVESEQ priority value 78.2 SAVESEQ priority value (5748-XE1) 78.2 V"SAVE option (5748-IX8) 7B.1 VMSAVE option (574B-XE1) 78.1
virtual storage preservation 78.1 VM "onitor 110-125 collection mechanism 110-125 collection mechanism 110.1 collection mechanism (574B-XE1) 110.1 considerations 122-123
data records 357-365
data volume and overhead 123
header record 357-365
monitor classes 110-125 monitor classes (5748- XXB) 110.1 monitor classes (574B-XE1) 110.1 responses to unusual tape conditions
121-122
tape format and content 357-365

Page of GC20-1807-7 As Updated April 1, 1981 by TNl GN25-0829 V MBlOK 19,29,50-53 VCUSTRT (address of VCUBlOK table)
53-54 VMCHSTRT (address of VCHBlOK table)
53-54 VMCOMND (last command) 50-53 VMDSTAT (dispatching status) 50-53 VMDVSTRT (address of VDEVBlOK table)
54-56 VMEXTINT (external interrupts) 50-53 VMIOACTV (active channel mask) 50-53 VMIOINT (I/O interrupts) 50-53 VMPEND (interrupts pending) 50-53 VMPSW (virtual PSi) 50-53 VMRSTAT (running status) 50-53 VMCF (Virtual Machine Communication
Facility) 143 DIAGNOSE instruction 143,159,203-204 data transfer error codes 161-169
return codes 161-169
external interrupt 164-161
invoking subfunctions 159
protocol 148-149
I DEN TI PY 152
S EN D 1 4 8-149 SEND/RECV 150 SENDX 151 VMCF (virtual machine communication
facility), special message facility 143 VMCF (Virtual Machine Communication
Facility)
subfunctions 153-169 AU TH 0 RI Z E 153
CANCEL 154
I DENTI FY 155 PRIORITY option 153,156-157,157
Q UIESCE 154 RECEIVE 158
REJECT 155 REPLY 158 RESUME 155
SEND 156-157 SEND/RECV 156-157 SENDX 157 VMCF (virt ual machine communicat ion
facility) , subfunctions, special message
facility 153 VMCF (Virtual Machine Communication
Facility)
subfunctions
SPECIFIC option 153 UNAUTHORIZE 154
table of subfunctions 144
user doubleword 164-161
using 145
applications 145
qeneral considerations 148
performance considerations 147
security 1q6-147 VMCPARM parameter list 159-162 VMFDUMP, command, usage 45-46 VMSAVE areas (5748-XX8) 78.2 VMSAVE areas (5748-XE1) 78.2 VMSAVE option (5748-XX8) 78.1 VMSAVE option (2748-XE1) 78.1 VM/370 Virtual Machine Facility/370 (VM/370) ) Volume Table of Contents (VTOC), support of
278- 279 VSAM W CMS support for 310 data sets
compatibility considerations 312-313
compatibility considerations (5748-XX8) 310-312.1
compatibility considerations (5748-XE1) 310-312.1 device support under eMS 310 macros supported under CMS 311-312
storage requirements for use under CMS
312-313 surport of 278-279 WAIT macro 273
wait state 27-29 CP disabled wait 27-29
enabled wait 29
RSCS
virtual machine disabled wait 30-31 virtual machine enabled wait 31
virtual machine
disabled wait messages 29-30 enabled wait procedure 30 WRITE macro 278-279 iTO/WTOR macros 275 X XCTl macro- 274 XDAP macro 273
Z ZAP, comm and 41
3 3203 Model 4 and 5 Printer, forms control
and print buffer 223
3262
FCB (5748-XX8) 222.1
FCB (5748-XE1) 216.1,222-225 UCSB buffer images (5748-XX8) 216,221 UCSB buffer images (5148-XE1) 211- 213,216. 1 3270 virtual console interface 199-200 attribute bytes, how to supply
( 5 7 4 8- X X 8) 1 91
attribute bytes, how to supply
( 5 748- X E 1) 1 99- 200 • 4
full screen interactions 199-200.4 full screen interactions 199-200.4 full screen mode 199-200.4 Index 383