OFF = 0 ON = 1

= 63 BINARY system

Punch cards 0 = 0 22 = m44 = H 1 = 1 23 = n45 = I 2 = 2 24 = 046 = J 3 = 3 25 = p47 = K 4 =4 26 = q48 = L 5 = 5 27 = r49 = M 6 = 6 28 = s50 = N 7 = 7 29 = t51 = O 8 = 8 30 = u52 = P 9 = 9 31 = v53 = Q 10 = a 32 = w54 = R 11 = b 33 = x55 = S 12 = c 34 = y56 = T 13 = d 35 = z57 = U 14 = e 36 = 58 = V 15 = f 37 = A59 = W 16= g 38 = B60 = X 17 = h 39 = C61 = Y 18 = i 40 = D62 = Z 19 = j 41 = E63 = ! 20 = k 42 = F 21 = l 43 = G

Hard drives

Modern keyboards

1 Bit = 0 or 1 1 Byte = 8 bits 1 Byte = character on the keyboard (, A, ©)

= Bit BINARY TO DECIMAL

255 = Decimal to 8-Bit binary

OPEN MICROSOFT WORD

DECIMAL TO ASCII

Bit Processor