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calculator SMAD

can add, subtract, miltiply and even divide!

inputs:
black buttons:
---- set input numbers. (Binary, LSB is on the left, just like normal numbers)

purple switch:
---- switch between adding and subtracting
-------- off = adding
-------- on = subtracting

blue buttons:
---- write the output of the add/subtract to
a input X times
-------- the darker blue the button, the more it will add. (light is 1 times, dark = 5 times)
---- used for multiplycation using the add mode
---- used for division in subtract mode
---- the output should be read from the
input you are writing to

blue switches:
---- write enable
---- will write to this input when a blue button is pressed.

tutorails:
add:
1: switch the purple switch is off if it isn't
already
2: enter your numbers to add in the different inputs in binary
3: your answer will be shown on the timers in binary

subtract:
1: switch the purple switch is on if it isn't already
2: enter your numbers to subtract from in the top input
3: enter the number you want to subtract
from the other in the second input
4: your answer will be on the timers (in binary)
5: if the answer seems to large it may be negative or you enterd the numbers the wrong way around.

multiply:
1: switch the purple switch is off if it isn't
already
2: set input 1 to zero
3: switch the blue switch next to that input
in and turn the other blue switch off
4: enter the largest number in the second input (this is not important for the result, but you will get your answer faster like this)
5: now press the blue buttons according to the number you want to multiply with. The lightest and lowest button = 1, and the darkest and top button = 5. If you want to multiply with more then 5 times, then press multiple buttons multiple times to have entertd the total amount at the end. For example if you want to multiply by 12,
then you press the top button twise to get 10 times,
and afterwards you press the 2nd button to get 12 times. make sure you wait until the calculation is finished between button presses!
6: the answer will be in the input that has the blue switch on.

divide:
NOTE: this calculator won't handle decimal points and will return the remainder instead.
1: switch the purple switch is on if it isn't already
2: enter the number you want to divide in the first input and switch it's blue switch on
3: make sure the other blue switch is off
4: enter the number you want to divide the
first number with in the second input
5: now press the light blue button until the
timers indicate a negative number
(will look like a very big number: all left (MSB) timers will be on) and keep track of the amount of times you pressed the button. (you can also use the other blue
buttons to do multiple presses
automaticly.) NOTE: make sure you wait with pressing the next time until the calculation seems finiched.
6: your answer will be the amount of times you pressed the blue button and the
remainder will be on the first input (the
ne with the blue switch on)