Simple 2-digit counter in Base-10 using 4-bit digital counters. Two momentary buttons in the top-left control the count. Top button increments count, while bottom button decrements the count.
There seems to be a bug in the time simulation on EveryCircuit, as this behaves differently depending on which machine I'm using. For example; this works as expected on my desktop computer at 20 ms/s, but at that simulation speed on my laptop, when decrementing through the 10's, it skips past 0 and goes to 9. 11->9, 21->19, etc. Changing the simulation speed on my laptop to 13.3 ms/s makes it behave the same as it does on my desktop.
