Number Representation 159
Normalization 159
Instructions160 ADD NORMALIZED 160 ADD UNNORMALIZED 162 COMPARE 163
DIVIDE 163
HALVE 164LOAD. 165 LOAD AND TEST 165 LOAD COMPLEMENT. 165 LOAD NEGATIVE. 166 LOAD POSITIVE 166 LOAD ROUNDED 166 MULTIPLY 167 STORE 168 SUBTRACT NORMALIZED 169 SUBTRACT UNNORMALIZED 169
Machine-CheckHandling 171
Machine-Check Detection 171
Recovery Mechanisms 172
Redundancy Correction 172CPU Retry 172 Unit Deletion 172
Handling of Machine Checks 172
Handling of Invalid CBC in Storage 172
Handling of Invalid CBC in Keys in Storage 173
Handling of Invalid CBC in Registers . 173
Check-StopState 175
Machine-Check Interruption Conditions 175
Machine-Check Interruption 175
Interruption Action. 175Point of Interruption 176
Machine-Check Logout . 177
Machine-Check Extended Interruption Information. 177
Machine-Check Interruption Code 178
Machine-Check Control Registers. 181
Control Register 14 . 181
Control Register 15 . 182
Summary of Machine-Check Masking. 183Input/Output Operations 185
Attachment of Input/Output Devices. 186
Input/Output Devices 186
Control Units 187
Channels. 187
System Operation 189
Compatibility of Operation 191
Control of Input/Output Devices 191
Input/Output Device Addressing 192
States of the Input/Output System 192
Resetting of the Input/Output System 194
Condition Code . 195
Instruction Formats 197
List of Instructions 197
CLEARI/O 198
HALT DEVICE 199
HALTI/O 202 START I/O 204 START I/O FAST RELEASE. 204 STORE CHANNEL ID . 206 TEST CHANNEL 207 TEST I/O. 208 Input/Output Instruction Exception Handling 210 Page of GA22-70004 Revised September 1, 1975
By TNL:GN22ยท0498 Execution of Input/Output Operations 210 Blocking of Data. 210 Channel Address Word . 210 Channel Command Word 211
Command Code . 212
Designation of Storage Area 212
Chaining . 213
Skipping . 215Program-Con trolled Interruption 215
Channel Indirect Data Addressing. 216
Commands 217
Conclusion of Input/Output Operations 222
Types of Conclusion 222
Input/Output Interruptions 226Priority of Interruptions 227
Channel Status Word 228Unit Status Conditions . 229
Channel Status Conditions. 233
Contents of Channel Status Word. 235
Channel Logout. 238I/O Communications Area . 239
SystemConsole 243 Operator Section 243
Address-Compare Controls. 244
Check-Stop Indicator 245
Configuration Controls. 245
Display-and-Enter Controls. 245
Emergency-Pull Switch . 245
Enable-System-Clear Key 245IMPL Con troIs 245
Interrupt Key 245
Load Indicator 245
Load Key. 245Load-Unit"Address Controls 246
Manual Indicator 246Power-Off Key 246 Power-On Key 246
Rate Control. 246
Restart Key 246Start Key. 247 Stop Key. 247
Store-Status Key. 247
System Indicator. 247
System-Reset Key 247
Test Indicator 247
Thermal/CBPower-Check Indicator 247 TOD Clock Key . 247
Wait Indicator 248
Remote Operator-ControlPanel 248
Customer-Engineer Section. 248, Appendix A. System/370 Features. 249
CentralProcessing Unit. 249 I/O Channels . 250 Availability of CPU Features on System/370 Models . 250 Appendix B. Functions That Differ From System/360 251
Removal ofUSASCII-8 Mode . 251
Handling Invalid DecimalSign. 251
RecognizingProtection Exception in Edit 251
Operation Code for HALT DEVICE 251
Extent of Logout Area. 251
Command Retry. 251
Logout on Channel Data Check 252
ChannelPrefetching. 252
vii
Normalization 159
Instructions
DIVIDE 163
HALVE 164
Machine-Check
Machine-Check Detection 171
Recovery Mechanisms 172
Redundancy Correction 172
Handling of Machine Checks 172
Handling of Invalid CBC in Storage 172
Handling of Invalid CBC in Keys in Storage 173
Handling of Invalid CBC in Registers . 173
Check-Stop
Machine-Check Interruption Conditions 175
Machine-Check Interruption 175
Interruption Action. 175
Machine-Check Logout . 177
Machine-Check Extended Interruption Information. 177
Machine-Check Interruption Code 178
Machine-Check Control Registers. 181
Control Register 14 . 181
Control Register 15 . 182
Summary of Machine-Check Masking. 183
Attachment of Input/Output Devices. 186
Input/Output Devices 186
Control Units 187
Channels. 187
System Operation 189
Compatibility of Operation 191
Control of Input/Output Devices 191
Input/Output Device Addressing 192
States of the Input/Output System 192
Resetting of the Input/Output System 194
Condition Code . 195
Instruction Formats 197
List of Instructions 197
CLEAR
HALT DEVICE 199
HALT
By TNL:
Command Code . 212
Designation of Storage Area 212
Chaining . 213
Skipping . 215
Channel Indirect Data Addressing. 216
Commands 217
Conclusion of Input/Output Operations 222
Types of Conclusion 222
Input/Output Interruptions 226
Channel Status Word 228
Channel Status Conditions. 233
Contents of Channel Status Word. 235
Channel Logout. 238
System
Address-Compare Controls. 244
Check-Stop Indicator 245
Configuration Controls. 245
Display-and-Enter Controls. 245
Emergency-Pull Switch . 245
Enable-System-Clear Key 245
Interrupt Key 245
Load Indicator 245
Load Key. 245
Manual Indicator 246
Rate Control. 246
Restart Key 246
Store-Status Key. 247
System Indicator. 247
System-Reset Key 247
Test Indicator 247
Thermal/CB
Wait Indicator 248
Remote Operator-Control
Customer-Engineer Section. 248
Central
Removal of
Handling Invalid Decimal
Recognizing
Operation Code for HALT DEVICE 251
Extent of Logout Area. 251
Command Retry. 251
Logout on Channel Data Check 252
Channel
vii