IBM System/360 2050

Log Pushbutton
Swik:h from Sequence Counter to Main Store Mode
: Seq Ctr 5
I Seq Ctr 6
hW2
I
*Rl
Seq Ctr 5 Decode
I
I Seq Ctr 7 JSeq Ctr 0
I R2 I Wl I W2
I R2 in Single I
I Cycle
I I
---.,.
1
+-Seq Ctr 1'-
I R2 I
RI
Seq Ctr 6 Decode
~
I
I
Seq Ctr 7 Decode
Coll for MS
Gate Clock Stotus Tgr
MS Mode
MS Clock
Store First Word in
MS Mode
Seq Ctr 0 Decode
Select Ctr
I
Seq Ctr 1 Decode
I
t
(Timing Chart Starts He,re)
NOTES:
1. Sequence counter changes stote during R 1 .
2. Gate word on scan bus from R2 late reg to next R2.
3. Gote scon bus to SOR and fire storage SAR, IAR at W2.
KH361
:;: FIGURE 18. LOGOUT UNDER SEQUENCE COUNTER AND MAIN STORE MODES (PART I OF 2)
Go to Seq Ctr Mode
Tum On Log T9r
Store SOR in HA 1
or Address 80
SAR to Scan Bus
Scan Bus to SOR
IAR to SAR
Store Former
Contents af
SAR in HA 2
or Address
8416 Also
8416 to IAR
SAR (Former
Contents of IAR)
to Scan Bus
Scan Bus to SOR
Cnt Up 4 in
IAR and SAR
Store Former
Contents of
IAR in 8816
Call for MS Mode
Error
(KTO?l) PSW Bit 13 = O
/and another logout
/ not in process
Seq Ctr 0-W2
Seq Ctr 1
Seq Ctr
1-W2
SeqCtr3}
SeqCtr4
Seq Ctr
5-W2
Seq Ctr6
SeqCtr7
No
Go to ROS and Co~
tinue, or Hard Stop
Store SAR
Store IAR
To Main Store Mode
Sequence Counter Control Mode