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addressed by X-lines 0-7 and Y-lines 3 and
4.
For the CPU mode operation the backuF
area can te addressed ty setting rrode
register bits 5,
6,
and 7 to
1,
O,
O.
For
operation in 2540 or channel mode (MMSK
bits
o.
2, 3, or 4 on), the low-order 8
bytes of zone 4 can be addressed.
None cf
the bytes of the tackup area can be
addressed when operating in 2311 rrode (MMSK
bit
1
on).
All 16 bytes of the backup area can be
addressed manually by console
s~itches
c
and D.
Assignrrents are as follows.
AS/BS
De<Dtde
~ ~
!
Assigned Function
0
UO
0 4 High-order Level-1 BackuF
aaar
1
U1
1 4 Low-order Level-1 Backup
aaar
2
VO
2 4 High-order Level-2 Backup
addr
3
Vl
3 4 I.ow-order Ievel-2 Backup
aadr
4
GO
4 4 High-order Level-3 Backup
addr
5
Gl
5 4 Low-order Level-3 Backup
add:r
6
DO
6 4 High-order Machine-Check
Backup Addr
7
Dl
7 4 Low-order Machine-Check
Backup Addr
8
IO
0 3 High-order CPU Branch and
link Backup Address
9
Il
1 3 Low-order CPU Branch and
I.ink Backup address
A
TO
2 3 S:E;are
B
Tl
3 3 Spare
C
PO
4 3 Workarea
D
Pl
5 3 Workarea
E
HO
6 3
~crkarea
F
Hl
7 3 Workarea
1-26 (7/69)
1.5.8.4 Zone 6 (1400 Compatibility)
Zone 6 is addressed when operating in 2540
mode CNMSK tits 3 or 4 en).
There are
eight l:ytes in the zone-6 area addressed by
X-lines 0-7 and y-line 6.
Also, zone 6 can
te addressed when in CPU mode by setting
the mode register bits 5, 6, 7 to 1, 1, 0
respectively.
AS/BS
Decode
0
1
2
3
4
5
6
7
§.Y!!!
~
X
Assigned Function
UO
0 6 Reader Image Buff er Address
U1
1 6 Reader Image Buff
er
Address
VO
2 6 Punch Image Buff er Address
Vl
3 6 Punch Image Buff
er
Address
GO
4 6 Reader/Punch Status
G1
5
6
Stacker-Select Information
DO
6 6 Punch Count
Dl
7 6 Read Count
1.5.8.5 zone 7 (1400 compatibility>
Zone 7 is address when operating in channel
mode CMMSK bits 0 or 2 on).
There are 8
bytes in the zone-7 area addressed by
X-lines 0-7 and Y-line 7.
The functional
assignments for these bytes are:
AS/BS
Decode Sym
~x
Assigned Function
0
uo
0 7
1
Ul
1 7
2
VO
2 7 Data Address Register
3
Vl
3 7 Data Address Register
4
GO
4 7
5
Gl
5 7 Data Register
6
DO
6 7 Status Register
7
Dl
7 7 Word Separator
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