ZSNES board

[grinvader]

Here's a place where I'd like anyone with the knowledge and time to do it to note down the names of ROMs that don't work right if you don't emulate specific points precisely.

It is vague on purpose, so that anything can be stored - from incorrect mirroring to dma sync delays, oam invalidation and bg horizontal scroll registers updating.

There's no hurry, but eventually noting down every little thing will help. The more obscure the better, obviously.

As to the info itself, something like this is probably enough:

[byuu]

You really should have started this thread five years ago :P
I wish I had kept track of such things, myself.

Super Conflict: sprites at exactly X=256 count all tiles in range-tile over. Without this emulated, the title screen is missing one of the name tiles.

[grinvader]

[Jonas Quinn]

Supporting OAM writes correctly (a word in the low table is only written on writes to the high byte): James Pond 3

[grinvader]

Just scouring through bsnes' changelogs:

- initialise SRAM to 0xFF [stupid awful jr baseball game noone plays]

Some vague stuff that would be cool to rant about more in detail here:
- "corrected" HDMA processing [overhyped sport game that's not soccer '97 flickering]

hmm, need moar changelogs. Did anyone keep them ?
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[tukuyomi]

More bsnes changelogs you ask?
http://snesemu.black-ship.net/misc/bsnes_changelog.txt

[grinvader]

That ought to work. Thanks.
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[byuu]

[Rashidi]

[grinvader]

[creaothceann]

[Nach]

This was brought up long ago in Snes9x development, and I also pointed out to several other people in the past few years, yet no one seemed to pay attention.

Different SRAM chips have different initial values. Not necessarily even a straight fill of just a particular value either, but a pattern of some sort.

Some game designers stupidly depended on the initial value, there's more Japanese only games with this problem than there are multi country games that exhibit this problem.

Snes9x has a list of game specific hacks to handle cases like this. The Snes9x Japanese developer hacks (UOSNES and the like) have even more game specific hacks to correct initial SRAM.

To really solve the problem, we'd need to get a list of which carts shipped with which SRAM (make and model).

I kind of doubt such info is in any way reflected in the header of a ROM image. I also can't really do any research on the subject without a better list of which carts came uniquely with which SRAM - and depended on it.
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May 9 2007 - NSRT 3.4, now with lots of hashing and even more accurate information! Go download it.
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Insane Coding

[byuu]

I suggested that we distribute games with pre-initialized empty SRAM files known to work, and have tools like NSRT offer to generate them from a database. Free emulators from having to deal with it.

I would love a list of these games and the values needed, as many people keep insisting 0xFF is good enough, which is very annoying.

By the way Nach, I haven't seen you on AIM, so I'll post this here in case you missed it.


(4-player Bomberman 2 with SNES multi-tap)

http://byuu.org/images/bs_345.png
http://byuu.org/images/bs_346.png
http://byuu.org/images/bs_347.png
http://byuu.org/images/bs_348.png

If you'd like, I can help get this merged into ZSNES. Only requires about ~2kb of code to link to my SGB+gambatte dynamic link library.

[Rashidi]

[Nach]

[byuu]

I wonder if the PCB IDs correlate, or if they tend to swap out SRAM chips on them. That would be pretty tacky to have two identical PCBs, where one game expects 0x00 SRAM and another 0xFF SRAM.

Rashidi, you know what I mean. Of course we have no influence over those sites anyway, as evidenced by the thousands of hacked up, header-variant games those sites tend to list so that "OMG WE HAVE THE MOST ROMZ!!!1"

[grinvader]

[Nach]

[whicker]

[Rashidi]

[franpa]

I doubt anyone would care really (except noobs). Good-sets already contain a lot of crap so adding more shouldn't matter to anyone.
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[paulguy]

I'd likely more go for the game specific .srm files as a separate downloadable set apart from the emulators. It keeps the emulators from having game specific stuff, and lets people play their games and avoids the absolutely horrible possibility of hacked up "fixed" ROMs.