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A B C D those are binary outputs. They ll give you a number. Usually they ll be connected to binary 7-segment decoder in the same letters. With real components check pin connection

Carry and borrow are often used when you have more than 1 display. Carry is output. A signal ll be trigred when counter reaches F (counters are hexadecimal its 16 deciaml) that signal should be connected to UP pin on de next counter

Correctin: carry ll trigger the signal when you reach 0 after using up while was on F

Borrow its output and works like carry. It ll produce a signal when you reach F after using down while was on 0

look up CD40193

On left side you have 1, 2, 4, 8 and load pin (these all are input pins) by combination of these numbers you can set initial value of counter. How to set initial value? Suppose you want to set 6 as initial value of counter, connect pin 2 and 4 to 5V supply and then connect 5V to load pin the seven segment display will show 6. On top you have up and down pins by applying HIGH (5V) logic to these pins you can increase or decrease the value of counter. On bottom you have carry and borrow pin when counter reaches to F and receives high on up pin then carry will set to high you can connect this pin to another counter's up pin same goes to borrow pin but this pin connects to down pin of another counter. On right you have A, B, C, D and reset pin, except reset pin others pin are output pins and give binary of counter numbers which can be converted to 7 segment display by BCD to 7 Segment converter. Applying HIGH logic to reset pin, will set the counter to 0 (not 6 that we have set above)

Nice explanation ax33m144

Thankzz guyss .really helped!

P.S really nice explanation ax33m144 👏

http://everycircuit.com/circuit/6315508094730240

I made that example for you

N.b-just for new begginers.:every single pulse fed to up or down pin initiates counter to move 1 step up or down respectively.

Thankzz for the help ☺