DEC        DECrement
Category:  Arithmetic operation
Function:  ACCX <-- (ACCX) - 01,
           or M <-- (M) - 01

Effects on the Condition Codes
H = N/A
I = N/A
N = R7
Z = ~R7&~R6&~R5&~R4&~R3&~R2&~R1&~R0
V = X7&~X6&~X5&~X4&~X3&~X2&~X1&~X0
C = N/A

ADDR    MNEM    OPER        1st     2nd     3rd
MODE    NOIC    FRMT        BYTE    BYTE    BYTE
________________________________________________

ACCX    DEC A               4A
ACCX    DEC B               5A
EXT     DEC     M           7A      MH      ML
INDEX   DEC     Disp,X      6A      Disp