Hah, so I ran into a rather serious problem with graphic insertion for the TV Shopping show. And I managed to bypass it in a (in my opinion) rather interesting way. So I thought I'd share the method...
Basically, the problem was that I had two NCGR-files (file containing many small graphics, tiles) consecutive in memory. And the first NCGR file was too small to fit the English translations in a nice way, it only allowed me to extend a single little image with 16x16px (as opposed to the previous images I've shown recently, where I could extend up to 10 or so images). If I'd try to add more, then I would've overlapped with the second NCGR. This causes the second NCGR to overwrite my changes that overlaps with it, making them worthless.
Now, fixing this would normally require assembly code hacking in some way. Change buffer sizes, addresses, pointers... Really messy, hard and time consuming. But I did look a bit at the asm-code, I found where the NCGR was being loaded, but I quickly gave up since I don't have time nor enough experience to do that.
Then I took a look at the memory where these two files are in an emulator. I quickly realized that the memory past NCGR 2 was unused, full of zeroes. So I came up with the idea to make NCGR 1 so big that it surpasses NCGR 2 and then place my translated graphics in that empty space.
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NCGR 2 will now only overwrite dummy data from NCGR 1 while I can still add translated images past NCGR 2. Sure this increases file size a few bytes (nobody cares), but it allowed me to solve the problem without writing a single line of code (I just specify how much space to allocate with my current code), no need for reverse engineering or anything. I thought it was a bit clever, really happy when it worked lol.
I haven't made any thorough tests yet, but I can at least add more graphics than only one now.
