def fetchchanges(ac, mq, mbr, ibr, ir, mar,
pc): #Prints changes after each fetch cycle
print("FETCHING INSTRUCTION")
if (ac == ''):
print("AC = ", ac)
else:
print("AC = ", ac, "Decimal value of AC = ",
bintodec.signedbintodec(bintodec.bintodec(ac), 40))
if (mq == ''):
print("MQ = ")
else:
print("MQ = ", mq, "Decimal value of MQ = ",
bintodec.signedbintodec(bintodec.bintodec(mq), 40))
print("MBR = ", mbr)
print("IBR = ", ibr)
if (ir == ''):
print("IR = ", ir)
else:
print("IR = ", ir, "Decimal value of IR = ", bintodec.bintodec(ir))
if (mar == ''):
print("MAR = ", mar)
else:
print("MAR = ", mar, "Decimal value of MAR = ", bintodec.bintodec(mar))
print("PC = ", pc + 1)
print()
def executechanges(ac, mq, mbr, ibr, ir, mar,
pc): #prints changes after each execution cycle
print("EXECUTE CHANGES")
if (ac == ''):
print("AC = ", ac)
else:
print("AC = ", ac, "Decimal value of AC = ",
bintodec.signedbintodec(bintodec.bintodec(ac), 40))
if (mq == ''):
print("MQ = ")
else:
print("MQ = ", mq, "Decimal value of MQ = ",
bintodec.signedbintodec(bintodec.bintodec(mq), 40))
print("MBR = ", mbr)
print("IBR = ", ibr)
if (ir == ''):
print("IR = ", ir)
else:
print("IR = ", ir, "Decimal value of IR = ", bintodec.bintodec(ir))
if (mar == ''):
print("MAR = ", mar)
else:
print("MAR = ", mar, "Decimal value of MAR = ", bintodec.bintodec(mar))
print("PC = ", pc + 1)
print()
def div(
mbr, ac
): #function to perform DIV Instruction, this function basically performs function of ALU for DIV
mbr_dec = bintodec.signedbintodec(bintodec.bintodec(mbr), 40)
ac_dec = bintodec.signedbintodec(bintodec.bintodec(ac), 40)
quo_dec = int(ac_dec / mbr_dec)
rem_dec = ac_dec % mbr_dec
return_str = dectobin.dectosignedbin(rem_dec) + dectobin.dectosignedbin(
quo_dec)
return return_str
def mul(
mbr, mq
): #function to perform MUL Instruction, this function basically performs function of ALU for MUL
mbr_dec = bintodec.signedbintodec(bintodec.bintodec(mbr), 40)
mq_dec = bintodec.signedbintodec(bintodec.bintodec(mq), 40)
result_dec = mbr_dec * mq_dec
if (result_dec >= 0):
bin_str = bin(result_dec).replace("0b", "")
while (len(bin_str) != 80):
bin_str = "0" + bin_str
return bin_str
else:
result_dec *= -1
bin_str = bin(result_dec).replace("0b", "")
while (len(bin_str) != 80):
bin_str = "0" + bin_str
return dectobin.findTwoscomplement(bin_str)
pc = pc + 1
ibr = ''
fetchchanges(ac, mq, mbr, ibr, ir, mar, pc)
decode(ir, mar) #decode and execute begins
if (bintodec.bintodec(ir) == 1): #LOAD M(X) INSTRUCTION
mbr = memory[bintodec.bintodec(mar) - 1]
ac = mbr
executechanges(ac, mq, mbr, ibr, ir, mar, pc)
elif (bintodec.bintodec(ir) == 2): #LOAD -M(X) INSTRUCTION
mbr = memory[bintodec.bintodec(mar) - 1]
ac = dectobin.dectosignedbin(
-1 * bintodec.signedbintodec(bintodec.bintodec(mbr), 40))
executechanges(ac, mq, mbr, ibr, ir, mar, pc)
elif (bintodec.bintodec(ir) == 9): #LOAD M(X), MQ INSTRUCTION
mbr = memory[bintodec.bintodec(mar) - 1]
mq = dectobin.dectosignedbin(
bintodec.signedbintodec(bintodec.bintodec(mbr), 40))
executechanges(ac, mq, mbr, ibr, ir, mar, pc)
elif (bintodec.bintodec(ir) == 10): #LOAD MQ INSTRUCTION
ac = mq
mq = ''
executechanges(ac, mq, mbr, ibr, ir, mar, pc)
elif (bintodec.bintodec(ir) == 5): #ADD M(X) INSTRUCTION
mbr = memory[bintodec.bintodec(mar) - 1]