ZSNES board

PAL mode has more scanlines?! I thought it just reduced the vertical blanking period to compensate for the increased resolution... e.g. 256x224 has 38 offscreen lines, and 256x239 has 23... If it did that, PAL wouldn't be slower than NTSC... since VBlank would be much shorter. There's some good inf...

Ok, i'm dumb. (a,X) uses the PBR, not bank 0 like (a). So (a,X) will wrap within the PB bank, and address loads will similarly wrap within the bank. [Edit: my comment was incorrect--what anomie wrote is correct.] I should really have said "program reads and bank 0 reads" wrap within their...

You know table 6-7 in the W65C816S datasheet? The one with a description of what the CPU is doing in each cycle of each instruction? In order to get to the point of cycle-accurate emulation, we'll eventually need a similar table for the SPC700. I couldn't find a datasheet or anything, so I've been t...

Blocking off $2100-$213f seemed the most logical to me, but that causes hundreds of graphical errors. Blocking off just $21:18,19,21,22,39,3a,3b (vram and cgram read/write) results in all games working fine though. According to anomie's doc, everything from 2101 to 2133 is not accessible while draw...

Cool. In summary, PBR and bank 0 reads will wrap within their bank, and other (DBR or long address) reads will carry over into the next bank. As far as I can tell, everything you tested there is consistent with the datasheet. Direct -- d: Word reads in native mode will carry across pages (can't tell...

While yes, the hardware -should- be perfect... it's smallest unit of time measurement is a master cycle. What if something takes 1.0001 master cycles, and another operation takes 0.9999998 master cycles? The purpose of a clock is to synchronize operations across a chip or set of chip(s). The actual...

The data sheet isn't for the exact same CPU. While that is true, I wouldn't expect the CPU core to be any different. They already had a perfectly working core--why fiddle with it? They would just design an asic with the stuff Nintendo wanted, and stamp the core down in the middle of it. But they mi...

Although I have no proof nor tests to back this up, I don't believe the master cycle counter is always perfectly accurate, and that all opcodes always execute at the exact same speed no matter what. I believe that all opcodes should execute in the exact number of CPU cycles shown in the data sheet ...

I don't like the idea of using architecture-specific code in my work. It rules out the possibility of porting your code, should the need ever arise, in the future. Lol yeah, I forgot to mention all the interesting parts of this would be in assembly and I don't much care about porting to anything bu...

I also found that IO cycles do not affect Open Bus, even though the datasheet specifies an address on the address bus. That makes sense. The datasheet probably just specifies what is visible on the address pins so people developing hardware to connect to the CPU know what to expect in each cycle. F...

I guess there is no way to cause the test loop to be an odd number of master cycles long. But you should at least make sure the length of an iteration in master cycles it is not divisible by 4, to avoid systematic bias (every iteration starting at mid-dot, or every iteration starting at a dot bounda...

FYI, i'm working on fixing snes9x's timing. I'm glad you continue to improve the timing in snes9x, since it is the best emulator available for most platforms (some would say all :)) and a good resource for others who are trying to learn about SNES emulation. BTW, the only way I can think of for the...

A few weeks ago I compiled wip sources with the freely available 2003 version of the MS compiler. I used the include and lib directories from MSVC6, but only for files not supplied with the 2003 compiler. I used the DirectX 9.0 SDK. It compiled fine and it seemed to work--but I didn't test the resul...

IIRC, MSVC6 was released a long time before 99

I guess you will need the common gorp, something like: (I didn't test this, it might contain typos)

What exact compile rror did it generate? The definitions of INT64 and UINT64 in jma\portable.h are not MSVC-friendly. In revisions 1.1-1.2 they look like this: typedef long long INT64; typedef unsigned long long UINT64; MSVC wants to see "__int64" instead of "long long". No doub...

DirectX 8.0 SDK w/ D3DX Import Libraries is not compatible completely with the ZSnes sources. There is simply too much conflict within the winlink.cpp code due to the heavy usage of very strict VC-only code to be compatible with GCC. So I declare the project dead but not buried. Out of curiosity, w...

Correct me if I'm wrong, but working on zsnes is your hobby, not your professional occupation?

Anyways, I hope you don't take my comments the wrong way. No offense was meant. I appreciate your contributions to NSRT and zsnes.

All this talk of falsifying hashes on headers is ridiculous. In order to put a header on a ROM, the tool would have to be able to calculate the proper hash for it. Anybody else who wanted to make their own header could obviously do that too...we aren't talking about digital signatures here! ;) The h...

I'm very offended. Hopefully he was joking. Which part of this suggest it's a joke? I don't understand how anything to do with programming can be deemed "offensive". Its not like his post contained racial slurs or anything. Whether to use <iostream.h> or <iostream> is not a topic worthy o...

What are you saying ? Headers are always meaningless to emulators... they are only used by copiers. Well, nsrt can use some unused header bytes to add his own controller data for use in zsnes, but apart from that, headers aren't used at all for emulators. I think by "headers are always meaning...

JMA features an incredible efficiency of compression for roms. For single OR solid archives, jma is better than zip, rar, and 7z. Sounds cool! Now if we could only get some sort of universal header onto SNES roms so that future emulators did not have to heuristically detect the correct memory mappi...

Same headers, different convention. I think omiting the .h is the correct version, but I'm not sure. Actually they are not the same. <iostream.h> and friends date back to before C++ was standardized some time around 1997. Namespaces were not in fashion yet, the .h headers defined their symbols in t...

bahamut: Regarding the GUID error messages, iirc you have two choices in a directx app: (1) in exactly *one* source file, define INITGUID prior to including any of the directx headers, or instead (2) link with a library called "dxguid". If your mingw32 version of DirectX does not include t...

Forgive my ignorance. I am curious--what is this new JMA support Nach has been adding?

It sounds like a compressed file format, but what exactly is it good for?
Can it do things that you can't do with an ordinary .zip file? Is it used by other SNES tools or something?

Nearly all of the performance-sensitive code is in assembly.