RCA 70/46 - Translate (TR)

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Translate

(TR)

General

Description

Format

(55)

Condition Code

Interrupt Action

Logical

I nstructiQn8

•

The

variable length operand specified

by

the

first

address

(B1/D

1

) is

translated,

byte-for-byte, according to

the

byte

translation

table

specified

by

the

second

address

(BdD

2

).

The

result

replaces

the

bytes

in

the

field

specified by

the

first address.

The

bytes

of

the

first operand

are

termed

the

argument

bytes.

Bytes

of

the

first

operand

are

selected

for

translation

from

left-to-right, one

byte

at

a time.

Each

argument

byte

is added to

the

second

operand

address,

which is

the

starting

location

of

a

translation

table.

This

sum,

in

turn,

addresses a byte location

within

the

table

containing

a

function

byte.

The

function byte

at

this

location replaces

the

original

argument

byte

of

the

first operand.

The operation

terminates

when

the

first

operand

bytes have been

exhausted.

DC L

o

7 8

15 16 19

20

31 32 35 36

47

• Unchanged.

• Address

error:

Addressing.

Protection.

Notes • 1. The

translation

table is

unaltered

unless overlap occurs.

2. The field to be

translated

and

the

translation

table

are

addressed

by

their

leftmost byte.

3. The length

of

a table,

in

general,

must

be 256 bytes, unless

the

domain

of

argument

bytes is limited to a specific

subset

by

the

program

and

data.

4. The L field specifies

the

length

of

the

first

operand

minus

one

(binary

00000001 = 2

bytes).

182

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