RCA 70/46 - Pack (PACK)

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Pack

(PACK)

General

Description

Format

(55)

Condition Code

Interrupt Action

Notes

Decitnal

Arithmetic

Instructions

•

The

operand specified by

the

second

address

(B:/D

2

)

is converted

from

zoned

format

to packed

format

and

the

result

is placed in

the

location

specified by

the

first

address

(Bt/D

1

).

The operand specified by

the

second

address

must

be in zoned

format.

The

sign is obtained

from

the

zone portion

of

the

rightmost

byte

of

the

second operand

and

is placed in

the

rightmost

four

bits

of

the

first

operand

(result

field). All

other

zones

are

ignored. The

four-bit

numeric

portions

(stripping

the

four-bit

zone)

of

each byte

are

then

placed

adjacent

to

the

sign,

and

to each other, to

fill

the

result

field.

The

result

is extended

with

high-order

zeros

if

the

second

operand

field

is

shorter

than

the

first.

If

the

first

operand

field is

not

large

enough

to

contain

all

the

significant digits

from

the

second

operand

field,

the

remaining

digits

are

ignored. The

operands

may

overlap.

F2

o

7 8 11 12 15 16

19

20

31 32 35

36

47

• Unchanged.

• Address

error:

Addressing.

Protection.

• 1. Signs

and

digits

are

not

checked

for

validity.

2.

The

second

operand

is

not

changed except

when

the

operands

overlap.

3. Processing is

from

right

to left, one

byte

at

a time.

164

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