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Thanks thefox; I was able to move it in from off screen.

I've encountered an odd bug where Nintendulator's main window no longer appears on load. I can get it to show up if I maximize it by right-clicking on the taskbar, but it will not display in any other circumstance. I think it might be loading the window outside the size of my current display resolut...

doppelganger wrote:Actually it would be if #$10 >= ScrollY. Remember the carry flag is set after a subtraction unless the second number (which in this case is ScrollY) is greater, then it will be clear for borrow.

My bad. I'm still getting used to assembly and the 6502.

What is the most efficient way to write the 'else' program structure in assembly?

The best I've come up with so far is:

I just tested this. MottZilla and tokumaru are correct: so long as either the sprite display bit or background display bit in $2001 are set to 1, the MMC3 IRQ will fire.

Thanks again everyone!

I can check it tomorrow, although I won't be able to post a test rom.

I believe that disabling sprites in 2001 also disables MMC3 IRQ line counting. Am I wrong?

This is great information. Thanks everyone. Here's how I'll run my dialogue box: I'll set IRQ to call at the top of the dialogue window, and then again at the bottom. Since MMC3 can bank CHR-RAM, I will keep the last 1kb of CHR-RAM empty at all times, and then when the top dialogue IRQ is called, sw...

zzo38 wrote:You could put eight blank sprites on the scanlines that you don't want other sprites to appear on.

True. But with a window 64 pixels in height, I'd have to use 8x4 8x16 sprites - half of my OAM.

Could I bank in an empty CHR-RAM bank - does MMC3 allow for CHR-RAM banking?

I'm creating a BG dialogue window for my game. I want Sprites to not appear on the lines where the dialogue window is being displayed. I'm using MMC3 for the scanline IRQs, and thus can't turn off sprites with $2001. I'm also using CHR-RAM, so I can't bank in blank data on those lines (or can I --- ...

Do either of these emulators have the ability to call a lua script when the program writes a given value to memory?

Bregalad, bigs ups for releasing this suite of compression algorithms. It was very helpful to me when I was putting together my text engine. A few posters have asked for an example of a decompression algorithm, so I'm posting one that I'm using in my current project. Each compression scheme best fit...

Your solution worked perfectly Disch. I really appreciate your help. I hacked your solution into my emulator so that if VRAM_Address = 0 after $2006 is written to with the latch set, I clear the Name table base address (D1-D0 of $2000)... and while this works perfectly for SMB, I should obviously lo...

- This isn't an human-friendly readable disassembled code. Apologies for that. NickMass, your output and mine both have the same problem: instruction $8EE2 reads from $0301, which should be zero. If it is non-zero, then this bug appears (I've noticed values $3F and $26 in $0301, although certainly ...

it might help if your tracer printed what address the CPU was reading/writing instead of just the instruction and addressing mode. As it is now, the tracer doesn't really do much of a job of illustrating what's going on. Where are the $2000 writes in this code? I assume those columns on the right a...