Editor Question

[Joshua Bone]

the S input is the decrement, the E input is the increment. The W output (increment overflow) fires a single pulse when the digit wraps UP from 9 to 0. The N output (decrement overflow) gives a solid output when the digit wraps DOWN from 0 to 9, and stays on until it counts down to 8.

In your case with two stacked digits (00) you decrement the lower to 9 and thus it fires the N output which causes the upper digit to decrement to 9. So, you go from 00 to 99. If you do it again, you can count down to 98, 97, 96, etc.


Using the increment counter on vertically stacked digits will only affect that digit, because the increment overflow goes to the west and is unused. See my level 26 `PROCESS IMPROVEMENT' for an example of a count-up/count-down clock that uses both the increment and decrement functions on the same set of digits.

Hope this helps