nesdev.org

I read through the code for FCEUX, and it looks like they do it at the end of a frame. This is a pretty horrible way to do it as if they have a single timing bug which they fix, it invalidates playthroughs. It really should be once per joyread. That also means that any other emulator wanting to use ...

nope, that doesn't work exactly right. Metroid gets past the press start, but SMB1 now gets out of sync.

I agree though that is probably how it should work.

I got it working on SMB1 and SMB2 by incrementing and setting the joystick state at the start of every frame. Unfortunately, this doesn't work for SMB3 or Metroid. Haven't tried any others yet.

SMB3 gets out of sync and Metroid doesn't even get past the press start.

The input log is specified in the file, but the docs don't really say when they should occur. At the beginning of a frame? the end? every time the joystick read is polled?

lol NES emulator in perl... oh god!

Yeah, learning and experimenting is always a good reason!

These days, there really isn't a very good reason that I can think of to code an NES emulator in assembly anymore. With the exception of nemulator, who needs to run 32 emulators at the same time, why would you go through the pain to do that?

In Beauty and the Beast in my emu, the screen jumps up and down wildly. Did you have a similar issue?

Off-topic, any idea where I can get info on the .fm2 and .fcm formats, so I can play back TAS videos in my emu?

updateVramAddress: function() { if (this.scanline >= 21 && this.scanline <= 260 && (this.f_bgVisibility || this.f_spVisibility) ) { if(this.f_addrInc == 1) { if((this.vramAddress & 0x7000) == 0x7000) { this.vramAddress &= 0x0FFF; switch(this.vramAddress & 0x03E0) { case ...

Put this fix into nezulator

I think that the odd behavior also happens when the big bombs goes off in the first level.

http://imgur.com/a/JmoTS

This problem is pretty universal to bright colors. Probably due to the analog nature of the RF.

Net effect is that lines that are supposed to be straight have little jaggies on the side.

Emulators look nothing like what a real NES does on a HDTV when hooked up with a rf cable. A real NES has every other scan-line offset one pixel from the other. Do any emulators do that? Certainly most do not - yet this is the actual intended view of the graphics.

Thats awesome! Thanks!