def Add(num1, num2):
# Split the two 16 bit input numbers into four 8 bit integers
num1lo = extract_byte(num1, 'low')
num1hi = extract_byte(num1, 'high')
num2lo = extract_byte(num2, 'low')
num2hi = extract_byte(num2, 'high')
if globals.debug == True:
print("num1lo: " , num1lo)
print("num1hi: " , num1hi << 8)
print("num2lo: " , num2lo)
print("num2hi: " , num2hi << 8)
# 6502 Assembly for 16 bit addition
OP.CLC() # clear the carry in
OP.LDA(num1lo)
cout = OP.ADC(num2lo)
reslo = OP.STA() # store sum of LSBs
if globals.debug == True:
print("cout1: " , cout)
ALU.set_C_IN(cout)
OP.LDA(num1hi)
OP.ADC(num2hi) # add the MSBs using the carry from above
reshi = OP.STA() # store sum of MSBs
cout = ALU.read_C_OUT()
# Debug
if globals.debug == True:
print("cout: " , cout)
print("reslo: " , reslo)
print("reshi: " , reshi)
# Return result
return((cout << 16) + (reshi << 8) + reslo)
def SEC(): # SEt Carry ALU.set_C_IN(1)
def CLC(): # CLear Carry ALU.set_C_IN(0)