I have six SN74LS181N-B circuits for arithmetic functions. I intend to utilise the A=B output, which is the comparison function. Sources have indicated that this function operates, if subtraction is acted, and the output word, (F), is 1111.
However, this does not seem to occur; I tried both situations of equality and inequality to observe if the pin is inverted; I even tried when the whole output word, (F), is 1111.
Additionally, I found that the Carry pins, (Cn, Cn+4), are inverted and thus suspect the output and input words are inverted. However, if I use normal averted inputs, it operates proficiently. Do I have to utilise external inverters?