Commodore Plus 4 - Page 254

242 Machine Language on the Commodore Plus/4
on the monitor). The examples may use concepts that are fully explained else
where in this book in addition to the instruction they are listed with.
Following is a list of the notation used in this section:
A
B
C
D
h
I
M
N
V
X
Y
Z
A
V
~
1
t
Accumulator
Break flag
Carry flag
Decimal mode flag
Hexadecimal digit (0 - F)
Interrupt disable flag
Memory location
Negative flag
Overflow flag
X register
Y register
Zero flag
Logical AND
Logical OR
Logical exclusive OR
Logical inverse
Push onto stack
Pull from stack
Transfer
Transfer
ADC—Add Memory to Accinnulator with Carry
The value currently in the accumulator plus the carry is added to the specified
operand, and the result is placed in the accumulator. Normally the carry is cleared
(see CLC) prior to an addition. When in decimal mode, the Z flag is not valid;
check the accumulator for a zero result.