def SUB(register):
if not validate.validate_reg(register):
print "Invalid Register: %s" % register
exit(1)
a = int(registers.reg["A"], 16)
if register == "M":
b = extras.getPair('H', 'L')
if extras.chkMemory(b):
b = int(registers.reg[register], 16)
else:
print " Invalid Memory:", b
exit(1)
else:
b = int(registers.reg[register], 16)
t = a - b
a = int(extras.getLowerNibble(format(a, '0x')), 2)
b = int(extras.getLowerNibble(format(b, '0x')), 2)
if not validate.validate_data(t):
print "\n////-----UnderFlow Detected----////\n"
t = format(t, "02x")
t = set_flags.setCarry(t)
set_flags.setFlags(a, b, t, isAbnormalFlow=True)
tmp = {"A": t[1:]}
else:
t = format(t, "02x")
set_flags.setFlags(a, b, t)
tmp = {"A": t}
set_flags.setFlags(a, b, t)
registers.reg.update(tmp)
def SUI(data):
a = int(registers.reg['A'], 16)
b = int(data, 16)
res = a - b
res = format(res, '02x')
if not validate.validate_data(int(res, 16)):
res = set_flags.setCarry(res)
set_flags.setFlags(a, b, res, isAbnormalFlow=True)
else:
set_flags.setFlags(a, b, res)
registers.reg['A'] = res
def DAD(reg1):
if validate.validate_reg(reg1):
c = 0
try:
reg2 = registers.reg_pair[reg1]
except:
print "invalid register pair", reg1
exit(1)
a = int(registers.reg[reg2], 16)
res = int(registers.reg['L'], 16) + a
if res > 255:
c = 1
res -= 256
registers.reg['L'] = format(res, '02x')
a = int(registers.reg[reg1], 16)
res = int(registers.reg['H'], 16) + a + c
res = format(res, '02x')
if not validate.validate_data(int(res, 16)):
res = set_flags.setCarry(res)
registers.reg['H'] = res
else:
print 'invalid register pair:', reg1
exit(1)