Instructions Arranged by Feature
CPU Tlmer and Clock Comparator Feature Instructions
Name Mnemonic Characteristics Code Page SET CLOCK COMPARATOR SCKC S CK M A SP B206 108 SET CPU TIMER SPT S CK M A SP B208 109 STORE CLOCK COMPARATOR STCKC S CK M A SP ST B207 111 STORE CPU TIMER STPT S CK M A SP ST B209 113 Direct-C'::ontrol Feature Instructions
Name Mnemonic Characteristics Code Page READ DIRECT ROD 51 DC M A $ ST 85 107 WRITE DII={ECT WRD SI DC M A $ 84 114 Precision Floating-Point Feature Instructions
Name Mnemonic Characteristics Code Page ADD NORMALIZED (extended) AXR FIR C XP SP U
E LS 36 160 LOAD ROUNDED (extended to long) LRDR RR XP SP E 25 167 LOAD ROUNDED (long to short) LRER RR XP SP E 35 166
MUL TIPL Y (extended) MXR RR XP SP U
E 26 167
MUL TIPL Y (long to extended) MXDR RR XP SP U
E 27 167
MUL TIPL Y (long to extended) MXD RX XP A SP U
E 67 167 SUBTRACT NORMALIZED (extended) SXR RR C XP SP U
E LS 37 169
Translatlon-Feature Instructions
Name Mnemonic Characteristics Code Page LOAD REAL ADDRESS LRA RX C TR M
A2 R
B1 106 PURGE TLl3 PTLB S TR M $ B20D 107 RESET REFERENCE BIT RRB S C TR M A1 B213 107 STORE THEN AND SYSTEM MASK STNSM SI TR M A ST AC 113 STORE THEN OR SYSTEM MASK STOSM SI TR M A SP ST AD 114
Multiprocessing-Feature Instructions
Name Mnemonic Characteristics Code Page SET PREFIX SPX S MP M A SP B210 109 SIGNAL PROCESSOR SIGP RS C MP M R
AE 110 STORE CPU ADDRESS STAP S MP M A SP ST B212 112 STORE PREFIX STPX S MP M A SP ST B211 113 Conditim'lal-Swapping Feature Instructions
Name Mnemonic Characteristics Code Page COMPARE AND SWAP cs RS C SW A SP R ST BA 123 COMPARE DOUBLE AND SWAP CDS RS C SW A SP R ST BB 124
PSW Key-Handling Feature Instructions
Name Mnemonic Characteristics Code Page INSERT PSW KEY IPK S PK M R B20B 105 SET PSW KEY FROM ADDRESS SPKA S PK M B20A 109 270 System/370 Principles of Operation

Program Status Word
o
Channel Masks 0-5 PSW Format in BC Mode 100000000 40 32 40 PSW Format in EC Mode
Appendix D. Formats
Interruption Code
16 31 I nstruction Address
63 000 0 0 0 0 0 24 31 I nstruction Address
63
Appendix D. Formats 271