My first circuit: 74155

[Prof_Magnesium]

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

The attachment IC74253.CircuitProject is no longer available

The attachment IC74257.CircuitProject is no longer available

IC74253.CircuitProject

(40.55 KiB) Downloaded 862 times

[Prof_Magnesium]

IC74257.CircuitProject

(32.17 KiB) Downloaded 861 times

[Prof_Magnesium]

IC74393.CircuitProject

(51.84 KiB) Downloaded 840 times

[Prof_Magnesium]

Adding more 3 CIs.

The attachment IC74241.CircuitProject is no longer available

The attachment IC74192.CircuitProject is no longer available

IC74241.CircuitProject

(22.25 KiB) Downloaded 802 times

[Prof_Magnesium]

IC74192.CircuitProject

(102.79 KiB) Downloaded 817 times

[Prof_Magnesium]

IC74193.CircuitProject

(105.21 KiB) Downloaded 794 times

[Prof_Magnesium]

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.

IC74122-123.CircuitProject

(229.44 KiB) Downloaded 775 times

[Prof_Magnesium]

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.

The attachment IC74170.CircuitProject is no longer available

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.

The attachment IC_S287.CircuitProject is no longer available

The attachment IC_S288.CircuitProject is no longer available

The attachment IC_2716.CircuitProject is no longer available

IC74170.CircuitProject

(133.24 KiB) Downloaded 772 times

[Prof_Magnesium]

The attachment IC_S287.CircuitProject is no longer available

IC_S287.CircuitProject

(18.3 KiB) Downloaded 1045 times

[Prof_Magnesium]

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

IC_S288.CircuitProject

(19.09 KiB) Downloaded 1043 times