Thanks for the suggestions.

> first: could you implement more advanced save/load dialog which would allow to select directory to/from save/load?

Unfortunately, that's harder than it sounds. Implementing a proper save/load dialog using custom UI requires correct handling of Unicode paths and filenames, which in turn requires major changes to the application. This is one of those things I decided early in development and are a bit hard to change at the moment. Don't forget that even if the simulator is capable enough to handle complex circuits, my initial thought was to make some kind of game out of it. So, arbitrary save/load paths didn't fit in such scenario.

Having said that, what I have in my TODO list is the ability to add slashes as separators when saving a schematic, in order to be able to group your circuits into subfolders inside the existing schematics folder. Still needs some work to be implemented properly, but it's a lot less than what's required for what you suggest (i.e. since DLS doesn't allow non-ASCII chars in its input boxes, there's no need to handle Unicode paths).

> second: component toolbar on the left

That sounds nice. And it might be more accessible in case I add more build-in components in the future. I'll think about it.

> And third thing: maybe text component which would allow to place text note in any place in circuit.

I had that in my list, but I cannot find it anymore :) Probably removed it as not-needed. As far as I remember, what I had in mind was something like PDF comment annotations. Small symbols on the schematic grid, which you click to show/edit a comment. Is this what you have in mind? Or you want the text to be visible at all times? Maybe a "pin note" button will allow both ways to be implemented. I'll also think about it.

> LogicWorks unfortunatly refuse to cooperate with my CPU.

I haven't used LogicWorks so I'm not familiar with its capabilities. Looking at its website, it looks way more professional than DLS :)

Do you mean that it cannot simulate your schematic fast enough? Do you have any numbers which you can compare with DLS once you manage to rebuild your circuit in it? E.g. how fast is the simulation in LogicWorks (i.e. circuit nsec per wall-clock sec), like in DLS? Is there such a metric in LogicWorks?

I don't know what kind of circuits you've managed to build with DLS so far, so I'd suggest to not expect much from it performance-wise. The largest circuit I've managed to build was a cycle-accurate i8080 CPU but the simulation performance isn't great (~750usec/sec on my i3-2100).