RCA Spectra 70 - Page 126

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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).

117

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