Vs System Coin Counter Questions

[Goose2k]

I am working on a Vs. System port of my game From Below.

I have not yet written any code to write to $4020 yet. This is supposed to be how you increment the "coin counter".

http://wiki.nesdev.com/w/index.php/Vs._ ... 2C_.26c.29

However, when a user runs my game on a dualsystem, he sees the coin counter increase.

I have put data breakpoints in Messen to verify that no data is being written there.

Is it possible only the Secondary CPU needs handle this or something? Or did some arcade hardware wire this up directly, rather than relying on the game?

nes2_counter.gif (3.06 MiB) Viewed 2544 times

[lidnariq]

Both sides of the Vs. System are supposed to have their own coin counter. If you aren't accessing $4020-$5FFF (read, write, execute) then I really have no idea how you're seeing that.

I don't suppose the person testing for you noticed anything else happening on-screen at the same time?

[Goose2k]

Nevermind... heard back from the person and they were putting coins in the other side of the Dualsystem machine. They were just showing me what it should look like.

[frantik]

if only all our bugs could be this easy to solve