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Fi le Op Register (FOP)
MDM 4-46
1111• 0
Search high
1
f<l'.ul tiple/trac k
2
search high or equal
3
count
4
:Key
5
Data
6
Read
7
Write
*
These eight fields tested with Branch
on Condition or Branch on Mask cont rel
words.
**
Any of these bits turn on DASI bit 4.
*** Any of these bits turn on DASI bit 2.
External Field Definitions, 2311 Disk Mode
<cro
to EXT)
0000
Unassigned
0001
Unassigned
2311 Storage Protect (key (STPO)
0010
0
S'IPO bit 3 (FQO)
1
STPO bit 1
(FQ1}
2
S'IPO bit 2 (FQ2)
3
STPO bit 3 (FQ3)
4
STPO bit 4
5
STPO bit 5
6
STPO bit 6
7
STPO bit
1
File 1400 Emulator Bus cut (FEBO)
0011
0
FEBC bit 0
1
FEBC bit 1
2
FEBO bit 2
3
FEBC bit 3
4
FEBC bit 4
5
FEBO bit 5
6
FEBO bit 6
7
FEEO bit 7
0100
unassigned
0101
Unassigned
0110
Unassigned
0111
Unassigned
1000
Unassigned
Module Select Register
1001
0
Module select
1
Module select
2
Module select
3
Module select
4
0
5
0
6
0
7
0
1010
Unassigned
Tag Register Out (TGRO)
?IDM 4-349
1011
0
Set difference
1
set cylinder
CMS)
0
1
2
3
2
set head and direction
3
Control
4
0
5
0
6
Trap gate
7
Control single shot
1100
Unassigned
File Flags Out (FFO)
1101
0
Chain data (CD)
1
Command chain CCC)
2
Suppress length indicator (SLI)
3
Skip
4
Program-controlled int (PCI)
5
0
6
0
7
0
File Bus Out (FBO)
?ID~
4-349
Set
Control
Cyl Hd/Dir
1110
0
Write gate
128 Frwd 1
1
Read gate
64
**2
Seek start
32
3
Rstr hd reg
16
4
Erase gate
8
5
Select head
4
**6
Return 000
2
••7
Head adv
1
i\'* Timed Operations
File Op Register (FOP)
1111
0
Multiple/track
1
Search high
2
search equal
3
count
4
Key
5
r:ata
6
Read
7
Write
x
x
x
Head 8
Head 4
Head
2
Head 1
Set
Difference
Not 128
Not 64
Not 32
Not 16
Not 8
Not 4
Not 2
Not 1
2025 FEMM (7/69)
1-49
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