Favourite NES emulator for debugging purposes?

Favourite NES emulator for debugging purposes?
by oRBIT2002 on 2010-05-21 (#61692)

Topic says it all.

by Zepper on 2010-05-21 (#61702)

- Everyone will say FCEUX (or any other variant of it).

by oRBIT2002 on 2010-05-21 (#61704)

I noticed FCEUX didn't like PAL that much. The scanline counter refused to work >240.

by Dwedit on 2010-05-21 (#61707)

The scanline counter is broken in debug mode anyway. The real problem is that the code is so messy thay it's difficult to get the current timestamp, and the timestamp of the previous frame.

by Hamtaro126 on 2010-05-21 (#61715)

Of course, Rveach's version of Nintendulator (http://rveach.romhack.org/Nintendulator/index2.php) has a few stuff that FCEUX does not:

+ Nametable Character Address from PPU with ROM access display and detection,
+ a Sprite Viewer capable of viewing characters instead of Hex,
+ a more accurate Palette view with Sprite Viewer
+ a more stable Scanline Counter to view in debugger

There is a couple of cons with this emulator for debugging:

- Outdated, unless updates are implented via FCEUX or Quietest's latest version of Nintendulator
- No Hex Editing
- No Sprite Access editing via Hex Editing
- Sprite viewer cannot display 8x16 at it's current state

Another good alternative to FCEUX, but I'm using both!

by GradualGames on 2010-05-21 (#61723)

Definitely FCEUXDSP 1.07, for me. The newest, fused version of FCEUX seems to have only partially implemented the debugger present in SP 1.07. It can load my namelist files (generated with nlgen), but does not insert the names or comments between disassembled lines of code; it only shows names in the actual disassembled code. For example, with the same namelist files, SP 1.07 will show me:

Code:
Name: .proc sound_initialize
Comment: ;enable square 1, square 2, triangle and noise

$D776:A9 0F LDA #$0F
$D778:8D 15 40 STA $4015 = #$FF
$D77B:A9 00 LDA #$00
$D77D:85 13 STA apu_data_ready: .res 1 = #$01
$D77F:20 55 DB JSR .proc sound_initialize_apu_buffer
$D782:60 RTS

but FCEUX 2.1.3 only does this at the same address:

Code:
07:D776:A9 0F LDA #$0F
07:D778:8D 15 40 STA $4015 = #$FF
07:D77B:A9 00 LDA #$00
07:D77D:85 13 STA apu_data_ready: .res 1 = #$01
07:D77F:20 55 DB JSR .proc sound_initialize_apu_buffer
07:D782:60 RTS

(though, prefixing with the bank number was a nice addition...)

SP 1.07 allows me to view all labels and comments in my source code, including across multiple prg banks (that is, with exhaustive namelist files). I'm hoping the fused version of FCEUX will eventually re-introduce these features (or document the current one so I can use it; I haven't met anyone yet who has been able to use it the same way as SP 1.07 either).