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File Bus In (FBI)
MDM 4-46
0001
0
Cyl a
a a
rs 128
1
Cyl add rs 64
2
Cyl add rs 32
3
Cyl addrs 16
4
Cyl add rs 8
5
Cyl add rs 4
6
Cyl add rs 2
7
Cyl add rs 1
2311 Storage Protect.
Key
(STPO)
MDM
4- 41
0010
0
STPO bit 3 (FQO)
1
ETPO bit 1
(FQ1)
2
STPO bit 2 (FQ2)
3
S'IPO bit 3 (FQ3)
4
STPO bit 4 (Q 4)
5
STPO bit 5 (Q5)
6
STPO bit 6 ( Q6)
7
STPO bit 7 (Q7)
File Out Bus CFCB) - Diagnostic
Set
Set
0011
Central
0
Write gate
1
Read gate
2
seek start
Cyl
128
64
32
16
8
Hd/Dir Difference
Frwd 1 Not 128
3
Restr hd reg
4
Erase gate
5
Sele
ct
bead
6
Return 000
7
Head adv
4
2
1
x
x
x
Head
Head
Head
Head
Not
64
Not 32
Not 16
8 Not 8
4 Not 4
2 Not 2
1 Not 1
Note:
Eit
2
can also be Clock
Thrcugh
K
and D ..
Dynamic Ccndition Register (DYN)
MOM
4-40
0100* 0
1
2
3
4
5
6
7
z=O
Storage wrap latch
OVFL Coverf low>
Adder carry
Not hold in (Dir Ctl feat)
Check disable switch
DYN Reg tit 6 (HZ=O)
DYN Reg bit 7
(LZ=O)
Disk Attachment Status In (DASI)
MDM 4-46
0101
0
Compare home address
1
Skip
2
Selected or any gated attention
3
Erase gate
4
Unusual condition
5
Status modifier not short search
6
Control unit end
7
Control unit busy
MMSK Register,. Bits 0-7 (MMSK)
lIDM
4-15
0110* 0
MMSKO Channel high trap
1
~MSK1
2311 disk control trap
2
MMSK2 Channel low trap
3
MMSK3 2540 reader trap
4
MMSK4 2540 punch trap
5
MMSK5 Comm chnl bit service
6
MMSK6 Comm chnl char service
7
MMSK7 Level 1
~riority
hold
Branch Conditions (BA)
:tfil.M
4-40
0111* 0
Chnl 0 interruption latch
1
Mode bit 0
2
Mode bit 1
3
Mode bit 2
4
IPL latch
5
I.S
zone bit 0
6
LS zone bit 1
7
I.S
zone bit 2
Counter 1 High in (CHI) - Diagnostic
MDM 4- 46
1000
O
counter position 32,768
1
Counter position 16, 384
2
Counter position 8,192
3
Counter position 4,096
4
Counter position 2,048
5
Counter position 1,024
6
counter position 512
7
counter position 256
Counter 1 Low In CCLI) - Diagnostic
MDM 4-46
1001
0
counter position 128
1
counter position 64
2
Counter position 32
3
Counter position 16
4
counter position 8
5
counter position 4
6
counter position 2
7
counter position 1
Terminating Conditions (TC)
MDM 4-46
1010
0
Data check in count **
1
Track overrun **
2
No record found **
3
Missing address n:ark **
4
Data check **
5
Overrun **
6
Track condition **
7
0
2025 FEMM (7/69)
1-47
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