www.logiccircuit.org

I am enjoying a lot LogicCircuit. Here are more 3 ICs I have mounted.

Adding more 3 CIs.

I tried to simulate the 74122 and 74123 one-shot CIs. I used the ideia of counting a number of periods of the clock. My project has an 8-bit counter which resets a D flip-flop when the count is equal to the preset value. This value is informed with two nibbles (2 x 4 bits) specific to each one-shot circuit. This mean that it replaces the R-C analogue delay. However I have some doubts about the validity of the method:
(1) which factors define the clock frequency?
(2) the clock I put in one timer circuit is the same for the whole simulation, or independent?
Finally I think that it would be interesting to introduce an analogue part in LogicCircuit to simulate these one-shot circuits, for instance, such as a R-C element that could be charged with a high level applied to it, combined with Schmidt triggers, for example.

Going on: one more 74xxx. I should stop now because I have now all the TTL IC I needs to simulate my 8-bit computer. I started to build RAM and ROM. To load the ROM I was surprised by the fact that the data must be stored in binary files. But it was not very difficult to transform ASCII in binary.

I put one file at a time because it doesn't work when I put more than one!