Storage Protection Switch Descriptions; Storage Protection Switch Settings - Control Data 3100 Reference Manual

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TABLE 2-3. STORAGE PROTECTION SWITCH DESCRIPTIONS
Output
Switch
Description
Position
"1" Up
Each address protected will have a "1" in this bit position.
"N"
Center Each address protected may have either a "1" or a "a" in this position.
For example. when all switches are set to the neutral position. all storage
is protected. provided that the protect feature is enabled.
"a"
Down
Each address protected will have a "0" in this bit position.
TABLE 2-4. STORAGE PROTECTION SWITCH SETTINGS
Examples:
Description of Protected Addresses Settings - Storage Addresses Pro-
Protection Switches tected (octal)
Single storage address
000 000 000 001 1 1 1 00017
Two nonsequential addresses of a
000 000 000 010 aNa 00020 & 00022
group of 108. *
000 000 000 010 N10 00022 & 00026
Four nonsequential addresses of a
000 000 000 010 NON 00020, 00021.
group of 108. * 00024. & 00025
000 000 000 010 NN1 00021. 00023,
00025. & 00027
Four address block- may be the
000 000 000 100 aNN 00040-00043
upper or lower half of a group
000
000
000 100
1NN
00044- 00047
of 108.*
1 08 address block 000 000 000 010 NNN 00020-00027
208 address block
000
000 001
OON
NNN
00100-00117
000 000 001 1 1 N NNN 00160-00177
408 address block - may be the
100 000 000 aNN NNN 40000-40037
upper or lower half of a group 100 000 000 1 NN NNN 40040-40077
of 1008.*
Numerous other groups and com-
000 000 000 NNN 1 1 a 00006, 00016.
binations of the above groups
00026 ... 00076
may also be protected. NNN NNN NNN NNN
1 1 1
All XXXX7 ad-
dresses
NNN NNN 001 NNN NNN All XX1XX ad-
dresses (00100-
00 1 77. 01 1 00-
01177, etc.)
* The first address of all groups of 108. 208. 408. 1008. etc .• must have a lower octal digit of zero.
Blocks of 1008, 2008. 4008, 10008, 20008. 40008. etc., may be protected in the same manner as
blocks of 108. 208, & 408.
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