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Decimal Arithmetic

Instructions

Decimal Overflow • A decimal overflow

inter~upt

exists when

the

result

field

of

an

Add

Decimal,

Subtract

Decimal,

or

Zero

and

Add

instruction

is too small

to

contain

the

overflow

data.

The

operation

is completed

by

ignoring

the

overflow

data,

and

setting

the

condition code to 3.

If

the

decimal overflow

program

mask

bit

is reset,

interrupt

will

not

occur

and

the

flag

in

the

IFR

will

not

be set.

Divide

Error

• A divide

error

interrupt

occurs

when

the

quotient is

greater

than

the

specified

data

field, including division

by

zero,

or

the

dividend does

not

have

one leading zero. Division is suppressed

and

the

dividend

and

divisor

remain

unchanged

in

main

memory.

157

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