IBM System/360

Subtract SUR 3F RR Rl,R2
FP. Subtract opr 2 from opr 1
Spec 0 Result
Unnormalized (Short)
(FPR) (FPR) Sign Fract = 0
(Low-order FPRs ignored and unchanged)
Exp Oflo
1 Result < 0
2 Result > 0
3
Exp Oflo
Supervisor Call SVC OA RR I
Immediate bits (8-15) replace (24-31) of the
None Unchanged
old PSW which is stored as a result of the
interrupt.
(16-23) are made zero.
(Old PSW at loc 32)
(New PSW from loc 96)
Test and Set
TS
93
sr-i ni(Bi) Hi-order bit of 1st opnd adr sets cond code. Prot 0 Hi-order
Entire byte then set to 1 's Adr bit= 0
1
Hi-order
bit= 1
2
---
3
---
Test Channel
TCH
9F SI Dl(Bl)
Opr 1 (21-23) identifies the tested channel. Privileged 0 Chan Avl
(Bits 24-31 are ignored.) Oper 1
Int Pending
(Instruction checks the channel's status
2 Chan in
and sets appropriate cond code. )
Burst Mode
3
Chan not
Operational