Computer Hardware

70/46

RCA 70/46 User Manual

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Special Function

#2

Scan Translation

Memory

and

Store

(STMS)

General Description

I Code

Format

Condition Code

Interrupt Action

Notes

Privileged

Instructions

•

The

Translation

Memory

is

scanned

for

nonzero values

of

the

G

hit,

and

the

table

of

halfwords

thus

found

is

stored

into

the

corresponding

halfwords

of

the

block

memory

identified

by

the

Block

Address

Table, etc.,

as

defined

for

the

Load

Translation

Memory

Special

Function

(CO).

• C1.

Rl

R2

0

3

4

7

•

Unchanged.

•

Addressing.

Power

Failure.

Machine Check.

Paging

Error.

Paging

Queue.

• 1.

The

high-order

byte

of

the

general

register

specified

by

Rl

contains

a

count

of

0-255

to

specify

1-256

translation

menlOry locations

in

each

of

the

blocks.

2.

The

low-order

three

bytes

of

the

general

register

specified

by

Rl

containing

the

address

of

the

Block

Address

Table

may

be

either

virtual

or

direct

as

indicated

by

the

D

bit

of

the

address

field.

3.

Bit

positions 7

through

15

in

the

general

register

specified

by

R2

contain

the

address

0-511

of

the

first

translation

memory

location

to be loaded.

This

may

specify

any

location

in

the

translation

memory.

Bit

positions

0

through

6

are

not

used

and

must

be zeros.

This

is

a

program

restriction

only.

4.

Bit

positions 23

through

31

in

the

general

register

specified

by

R2

contain

a

count

0-511

specifying

the

number

of

words

in

the

Block

Address

Table 1 to 512, respectively.

Bit

positions 16

through

22

are

not

used

and

must

be zeros.

This

is a

program

restriction

only.

5.

The

high-order

byte

(0-255)

in

each Block

Address

Table

word

specifies

the

number

of

halfwords

(1 to 256)

to

be

loaded

from

the

block specified

by

the

low-order

three

bytes.

If

this

count

is less

than

the

count

contained

in

the

high-order

byte

of

the

general

register

specified

by

Rl

(translation

memory

block

size),

the

remaining

translation

memory

locations

of

the

specified

block

are

loaded

with

zeros.

If

this

count

is

greater

than

the

trans-

lation

memory

block size count,

loading

is

terminated

by

the

trans-

lation

memory

block size

count

reaching

zero.

94

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RCA 70/46 Specifications

General

Brand	RCA
Model	70/46
Category	Computer Hardware
Language	English

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