RCA Spectra 70 - Page 125

Insert Storage Key
(15K)
General Description
Format
(RR)
Condition Code
Interrupt Action
Notes
Privileged
Instructions
• The storage key of the 2,048-byte main memory block, which is located
at the address contained in the general register specified by the second
address (R
2
), is inserted in the general 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. The general register specified by the second address (R
2
)
contains
the location of the 2,048-byte main memory block in bits 8 through
20. Bits 0 through 7 and 21 through 27 are ignored. Bits 28 through
31 must be zero.
0
0
0
2. When the five-bit storage key is inserted into bits 24 through 28
of the general register specified by the first address, bits 0 through
23 are unaltered and bits 29 through 31 are made zero.
3. The
address of the storage key for a specific 2,048-byte main memory
block is specified in R2 by a binary count as shown in the following
examples:
Storage Key Address in R2
IGNORED
1
0
0
o 0 0 0
0
o 000
o 0 1
IGNORED
1
0
o 0
01
7 ,8
v
20 I 21
27~
Address of Storage
Must be
key for first 2,048
zeros
main memory block
IGNORED
I 0
0 o 0 0 0 0
000
0
1
o 1
IGNORED
1
0
o 0
01
7 ,8
20 I 21
27~
v
Address of Storage
Must be
key for third 2,048
zeros
main memory block
IGNORED
1
0 0
000 0 0 001 0 0
1 I
IGNORED
1
0
o 0
01
7 ,8
20 I 21
27
~
v
Address of Storage
Must be
key for tenth 2,048
zeros
main memory block
116