The diagnostic image would be something like a flat 32K which has a page aware program on each page - so it knows if it's at the right place and can check that the other pages are coming up with the correct memory location - as that appears to have been the initial issue here. It's just to eradicate...

OK - so it doesn't exist - which is my point. Assuming kevgal is up for it - I believe it's time to kill off this insane hall of mirrors forever. All it does is add another level of complexity which is not needed. How about we look at knocking up a diagnostic image for the hardware - just to ensure ...

Sorry - I call bullshit on that one.

Please look at your chart again and explain why only the 6K ROM has the wrong memory addresses swapped.

Tell me the name of the 6K ROM you think can be cut up this way and still work.

Ok guys - please point me to any ROM which has mirroring at $B800 - it's nonsense!

4K + 2K is inverted - 4K block is at $B000, 2K page is at either $A000 or $A800, or mirrored to both.

Finally got all the roms behaving as 32k roms but I can't figure out how to get the 18k Chopper game to work as a 32k rom. Tried various combinations of banks but to no avail. Is this your preferred way to get your lottery numbers :D An 18K ROM, if downloaded from here, it will be stored in this fo...

I can sort of understand that going from one bank of 16k to 2 banks of 16k could cause some issues but why would a 6k game like planet defender need to have the first 4k swapped with the second 2k (with extra padding) to make it work as an 8k rom? That's because in the original cartridge there was ...

OK - let's think this through.

Where in memory does the original 16K ROM sit?

Why does it need to be anywhere else?

Is the earth still flat?

I can't find the original post - but here's the ZIP with all ROMS swapped. Logically, poor choice of word but hey, the ROM image is arranged as 8000 9000 A000 B000 4000 5000 6000 7000 I really don't understand why we continue to do this - as it's pretty much proven to be false in almost all cases. F...

The quick patch to invert the fire buttons for Astropib.bin is to switch the tests at $AE14, file offset $E15

Wow! Have you had a chance to test if it works yet?