RCA 70/46 Reference Manual page 126

Set Storage Key
(SSK)
General Description
Format
(RR)
Condition Code
Interrupt Action
Notes
Privileged
Instructions
• The storage key of a 2,048-byte main memory block located at the
address contained in the general register specified by the second address
(R
2 )
is set according to the value contained in the register specified by the
first address (R
1 ) .
o
7 8 11 12 15
• Unchanged.
• Privileged operation.
Address error:
Addressing.
Specification.
Operation code trap (if the memory protect feature is not installed).
• 1. Bits 8 through 20 of the register specified by the second address (R
2 )
contain the location of the 2,048-byte main memory block where
storage key is to be set. Bits 0 through 7 and 21 through 27 are
ignored. Bits 28 through 31 must be zero.
2. Bits 24 through 28 of the general register specified by the first
address (R
1 )
contain the five-bit storage key to be assigned. Bits
o
through 23 and 29 through 31 are ignored.
3. The address of the storage key for a specific 2,048-byte main memory
block is specified in R2 by a binary count (see examples under Insert
Storage Key description).
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