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OTHER SYSTEM FUNCTIONS
27.1 -
Register Functions
X is unchanged.
CC
has
been set as in a normal unsigned
addition.
27,1.8 Subtract B from X -- .SUBX
The . SUB X
function
subtracts
register
from
the
contents
subt~action
is
performed
as
if
a
number.
the
contents
Or
the
B
of
the
X
reg
ister.
The
were
an
unsigned
binary
ENTRY PARAMETERS:
EXIT CONDITIONS:
None.
A is unchanged.
B is unchanged.
X
has been decremented
by
the contents
o~
B.
CC has been set as in
a
normal}
subtraction.
unsigned
27.1.9 SubtTact A Prom X --
.SUAX
function
subtracts
the
contents
Or
the A
The
.
SUAX
register
from
subtraction
is
number.
the
contents
of
the
X
register.
The
ENTRY PARAMETERS:
EXIT CONDITIONS:
perrormed
as
i~
A
were an unsigned binary
None.
A is unchanged.
B
is unchanged.
X
has been decremented
by
the contents
Or
A.
CC
has
been set as in
a
normal unsigned
subtraction.
27.1.10
Subtract a,A
from X -- .SUBAX
The
.
SUBAX
function
subtracts
the
contents
of
the
register pair a,A from the contents oT the X register.
ENTRY PARAMETERS:
EXIT CONDITIONS:
None.
A
is unc hanged.
B is unchanged.
X
has been decremented
by
the contents of
B, A.
CC has been set as in a
normal
unsigned
sub trac:
t
ion.
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