Try Breaks Debugger: viewtopic.php?f=8&t=6973

https://github.com/emu-russia/breaks/re ... s-debug-18

There's a tab that shows what's going on at the bottom of the processor.

Both are an approximation of what is actually there.
Logisim does not support bidirectional connections, which are used in large numbers at the bottom of the processor (buses).

The one in the book contains no special "hacks" to handle bus conflicts.

You need to figure out on your own how best to ...

See more about very first half-cycle here: https://github.com/emu-russia/breaks/bl ... ops/brk.md

I get it. You are looking at the state after the very first half cycle (PHI1), during which 6502's behavior is Undefined.

This is due to the fact that the command latches for the lower part are only updated during PHI2, so on the first half-cycle of PHI1 the lower part "goes crazy", as almost all ...

Yes, the 6502.circ works well.
Maybe they downloaded the "Evo" version (for Logisim Evolution), which may still contain bugs since it hasn't been updated in a while.

Finally, this monumental work is published! Congratulations!

Minor errors will be corrected in time. Those who have been engaged in circuitry for a long time know that "digital logic is very logical", so the circuits will settle down properly sooner or later. :)

Enjoy your trip with 6522 :)

They denote the group of transistors that form the flip-flop.

Big upgrade, resulting in the "B" revision.

https://github.com/emu-russia/breaks/re ... -book-revB

Enjoy your reading!

Good luck to your students! I'm very curious what they will do

No problem, but it's better to mention the `Breaks` project on GitHub (https://github.com/emu-russia/breaks) rather than me, since it's a team effort

Try this: viewtopic.php?f=8&t=6903

I understand. Then we'll wait to see how it ends.

On behalf of the entire staff of the Breaking NES project, I express our gratitude to you!

Спасибо!

I got a value of 96241361 cycles, not including the initial BRK reset sequence. The test stopped as soon as the PC was 0x3469 (`success`).

If we're talking about slow... Our 6502 model in Logisim will run the Klaus tests for about 44 days. (Measurements have shown that the speed in Logisim is about 1500 CLK per minute).

https://github.com/emu-russia/breaks/tr ... /6502.circ