RCA 70/46 - Page 195

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Interrupt Action

Notes

• Address

error:

Addressing.

Protection.

Data

error.

Logical

Instructions

• 1. The

leftmost

four-bits

of

any

source field byte

must

be a valid digit,

otherwise a

data

error

interrupt

occurs.

2. The

rightmost

four-bits

of

any

source field byte can be

either

a digit

or

a sign.

3. Multiple field

editing

is possible by

using

the

field

separator

code

within

the

mask

pattern.

4. The zones

of

the

expanded source digits can be

either

EBCDIC

or

USASCII,

as

specified

by

the

mode code. When

the

mode code specifies

EBCDIC, zone code 1111 is generated. When

the

mode code specifies

USASCII,

the

zone code 0101 is generated.

5.

The

rightmost

four

bits

of

any

source field

byte

can be a

digit

or

sign

as

follows:

Codes Deflnition

0000

~

1001

Digits

1010,1100,1110,1111

Plus

sign

1011,1101

Minus

sign

6.

Overlapping

of

fields yields unpredictable results.

7.

In

testing

for

Paging

Error

or

Paging

Queue

interrupt

conditions,

the

hardware

assumes

that

the

number

of

bytes

in

the

source field

is equal to

the

number

of

bytes in

the

pattern

field.

If

the

assumed

source field extends across two pages,

of

which

the

second page

has

any

of

the

conditions

causing

Paging

Error

or

Paging

Queue

interrupts,

but

the

actual source field

number

of

bytes is

short

enough

to

fit

within

the

first page, a false

Paging

Error

condition

or

Paging

Queue

Interrupt

condition occurs.

186

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