nesdev.org

After my recently trouble getting this to work and an inordinate amount of patience and help from Memblers and kevtris last night over on #nesdev, I've finally solved the problem. These are mainly just issues with the Mac OSX build of Nestopia so it may not apply to everyone but I went through so mu...

Is there a special way to handle/enable the second controller? I know there's an issue with reading the controller inputs when using DPCM but I'm not using it. Did you change the 1/0 strobe write address from $4016 to $4017 also? (I'm just thinking because you said you replaced $4016 with $4017). W...

Just doesn't seem to be my week this week. First the battery-backed RAM problem (which I still can't get to work) and now this. :( I have a subroutine in my code that returns dynamic and debounced button states for controlller 1 and it all works fine. So I wanted to do the same for controller 2. As ...

Maybe some emulator requires it but now I'm just speculating. I wanted to help you more but my knowledge about the subject stop there. I'm sure someone else on the board should be able to confirm the cause of your problem. No problem, thanks for the info. It's got to be something simple/silly - it ...

The comments in that iNES header code are irrelevant

But in any case, commercial game ROMs seem able to create an .IPS file in the folder where the ROM is. :( I don't know about MMC1 but if commercial games does create the save file then the emulator seems to be working fine. In that case, there is a good chance that it's a setting problem in your in...

Dwedit wrote:Setting the save file directory in nestopia?

There's no (obvious) setting for it. That may be particular to the OSX version though?

But in any case, commercial game ROMs seem able to create an .IPS file in the folder where the ROM is.

Enabling the PRG RAM ..? :) I've just tried that by doing; lda #%00000000 ldx #$80 stx $FFFF sta $FFFF lsr a sta $FFFF lsr a sta $FFFF lsr a sta $FFFF lsr a sta $FFFF to no avail :( 1) Do you have to write all of the MMC1 registers in sequence or can you just write to one (as I've done)? 2) Presuma...

Hmmmm, it seems it does but getting it to work seems quite far from "automatic" :) Can anyone help? I'm guessing I have to configure my iNES header to use an MMC1 mapper with batter-backed RAM option? I think I've done that because now when I load the ROM file into Nestopia it comes up wit...

Does anyone know of a clever way that I could dump a portion of RAM from an emulator (Nestopia) so that I can access the binary file from my computer?

I'm writing a NES drum-sound editor and want to be able to save the sound tables to include in my sound engine.

Forgetting to disable the APU Frame IRQ is the common culprit, here. ; do this at program startup LDA #%01000000 STA $4017 You got it :) I've just removed the CLI command as I'm not using the IRQ anyway (doing the CLI was just a legacy thing, left over from old reset vector code - force of habit I ...

Ah, seems it's something to do with the CLI command. If I remove it, the background processing works.

Do you have to do something special in your IRQ routine, even if you're not using the IRQ to do anything? Currently my IRQ routine is just an RTI. Is that wrong?

Do you mean VRAM ($2007)? Can't write to VRAM outside of VBlank unless you disable rendering (disable both BG and sprites via $2001). There's no reason why you can't write to normal RAM though ($0000-07FF). In fact you certainly should be able to. Yes, normal RAM. I was just going to come back and ...

Is there a reason that I can't write to RAM in my background loop?

It works fine if I modify some RAM values during VBLANK but doing the same modification in the background loop doesn't change the values.

I'm sure I'm missing something obvious but I can't see.

fceudx does.. press scroll lock i think http://nesdev.com/bbs/viewtopic.php?t=5099 Ah. That's good-news, bad-news for me. The bad-news being I've never been able to compile FCEUDX (Mac OSX). There's a makefile for OSX included in the source but it throws a ton of errors that I've not managed to fix...