def STAX(register):
if validate.validate_reg(register):
a = extras.getPair(register, registers.reg_pair[register])
registers.memory[a] = registers.reg['A']
else:
print "Invalid Register:", register
exit(1)
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 MVI(reg, data):
if reg == 'M':
a = extras.getPair('H', 'L')
registers.memory[a] = data
elif validate.validate_reg(reg):
registers.reg[reg] = data
else:
print "Invalid Register"
def MOV(reg1, reg2):
if not validate.validate_reg(reg1):
print "Invalid Register: %s" % reg1
exit(1)
if not validate.validate_reg(reg2):
print "Invalid Register: %s" % reg2
exit(1)
if reg1 == 'M':
a = extras.getPair('H', 'L')
if extras.chkMemory(a):
registers.memory[a] = registers.reg[reg2]
else:
print " Invalid Memory:", a
elif reg2 == 'M':
a = extras.getPair('H', 'L')
registers.reg[reg1] = registers.memory[a]
else:
registers.reg[reg1] = registers.reg[reg2]
def INR(register):
if validate.validate_reg(register):
if register == 'M':
a = extras.getPair('H', 'L')
if extras.chkMemory(a):
b = int(registers.memory[a], 16) + 1
if b > 255:
b = 0
registers.memory[a] = format(b, '0x')
else:
print "invalid memory:", a
exit(1)
else:
b = int(registers.reg[register], 16) + 1
if b > 255:
b = 0
registers.reg[register] = format(b, '0x')
def DCX(reg1):
if validate.validate_reg(reg1):
try:
reg2 = registers.reg_pair[reg1]
except:
print "invalid register pair", reg1
exit(1)
a = extras.getPair(reg1, reg2)
a = int(a, 16) + 1
if a < 0:
a = 65535
a = format(a, '04x')
registers.reg[reg1] = a[:2]
registers.reg[reg2] = a[2:]
else:
print "invalid register", reg1
exit(1)
def CMP(register):
if validate.validate_reg(register):
a_data = int(registers.reg['A'], 16)
if register == 'M':
a = extras.getPair('H', 'L')
if validate.validate_memory(a):
a = int(registers.memory[a], 16)
else:
print "Invalid Memory:", a
exit(1)
else:
a = int(registers.reg[register], 16)
if a_data < a:
registers.flag['CY'] = 1
elif a_data == a:
registers.flag['Z'] = 1
else:
registers.flag['CY'] = 0
registers.flag['Z'] = 0
else:
print "Invalid Register:", registers
exit(1)
def SHLD(mem):
a = extras.getPair('H', 'L')
registers.memory[mem] = a