PC Engine dev forum

I have been playing around with mednafens debugger and found a pointer to a string. The game is Xak 1 & 2. How would I set up a conditional breakpoint to have the debugger snap when 0x83 is written to an address like $2002? Also, I know you can trace in Mednafen. What setting would I have to modify to have the debugger do a filtered trace instead of an unfiltered one?

Unfortunately mednafen debugger is not that advanced. You can't set conditional breakpoints or filter trace
You'll have to harass mednafen developer (hidden under Mednafen on this forum )

Thanks for answering my question. I found out that banks are 64kb and want to know if the whole 0000-ffff range can be used as pointers. If not, will the range be 8000-ffff?

I found out that banks are 64kb and want to know if the whole 0000-ffff range can be used as pointers. If not, will the range be 8000-ffff?

The logical address range is 64k, but banks are 8k. The full $0000-ffff range is available for read/write break points. You can break on multiple individuals or a range like: 4000-6200. You can break on external address ranges instead of logical, but it needs to be preceded with an * (you can also use the bank notation too xx:1fff) and you can setup a range as well. Control + W or R will setup breakpoints for VRAM addresses.

But yeah, unfortunately there's not conditional break support like $2002=$83. BTW, if you found the pointer to the string and the string, you can just use a external/long address break on the start of the string or a specific character for a trigger instead.

Thanks for answering my question. I was able to repointer text to an area with more free space. I'll do some more experimenting and see if I can come up with a demo.