‫Welcome to the new Them station on the RTG 7 board we have four different four digit 770 displays on
‫the breadboard.
‫The first one that it says I want is by we have input for the Alieu the signal we have and put B.
‫And the bottom two are used to represent the result of our earth take launching unit.
‫We also are tying each of the different segments through a 56 resistor into the J.
‫P Mom port of the RTG 7.
‫All the digits are controlled through 16 and then two and three or four transistors with a 470 ohm resistor
‫connected into the chip kit header on the RTC 7.
‫We also have three external slides switches that are used as the opcode for the Alieu.
‫We have our switch one which we're using for the add or subtract we have our switch 0 which is used
‫to select the different digits.
‫And we have different buttons buttons 0 1 and 2 are either adding or subtracting 1 10 and 100 and our
‫button 3 is used to execute this arithmetic logic unit.
‫So start out let's go ahead and start setting values or inputs A and B.
‫So if we start we're going to we're starting our input B and if I change my switch one down or so.
‫Exactly.
‫So here I have a negative one negative to 3.
‫So on and so forth.
‫So I set this up to positive for and we're going to go ahead and now change the value on our input.
‫So slight up or switch 0.
‫And just like with the with arm would be we can make it negative or positive which will go to a negative
‫value.
‫So make it a negative 3.
‫So right now in order to test our aone you we are going to perform different operations and there's
‫a control through the opcode instructions which are on these three slide switches.
‫So the first opcode is 0 3 zeroes.
‫So what set it.
‫So we have all reset to zero and this up card is going to take the value and place it in our result
‫register.
‫So pressing button three will see there are some negative 3.
‫Result is a negative 3 as well.
‫Our next is we're in a place we go 0 0 1 is going to take the value.
‫We place it in our all register so are pressing the button see that our form now moved.
‫The result register the next is 0 1 0 2 0 1 0 and this operation is going take a plus b.
‫So if we take a negative three plus four is a positive one.
‫Press a button and we see a result register as a value of positive one.
‫Now we get Z.
‫Our next stop is 0 1 1.
‫This operation is going to take a minus B.
‫So if you press a button three We'll see if we take are negative 3 and 6 x 4 will do negative 7.
‫So this is shown in our result register of this Alieu And we also have several other instructions have
‫a 1 0 0 0 1 0 0 press a button.
‫We set our Or rather our Procrit to Sir all to zeros.
‫If we go with a 1 0 1 1
‫0 1 this is going to set all the values to 1.
‫Now these are sine values that's going to create a negative 1 values by pressing button 3 you'll see
‫we have a negative one show up in our product register.
‫And so this is just a demonstration of how you can work.
‫And these are kids who went through.
‫You can add as many different instructions as you want to your age.
‫Are you now we only have three digits allocated for up to.
‫So we can only do up to eight different commands.
‫But if you'd make a larger OP could decide you could do a lot more different a lot more commands.
‫So this an example of the Alieu running on RTC 7 on board.