ROM Header and Emulators

Ketsuban · Post by **Ketsuban** » Thu Feb 01, 2007 6:39 pm

Why is it that current emulators expect the header for the game to be exactly as it is presented in sega2? All the TMSS does is expect "SEGA" or " SEGA" to be present at $100. Then it loads the stack pointer from $0 and the PC from $4.

The result of this behaviour is inaccurate emulation - two examples that I can think of off the top of my head are Pocket Monsters (Unl) and Pocket Monsters 2 (Unl), which fail to run entirely.

Stef · Post by **Stef** » Thu Feb 01, 2007 7:24 pm

Unlicensed... it's the word.

Mask of Destiny · Post by **Mask of Destiny** » Thu Feb 01, 2007 8:28 pm

Are those made by Realtec? There are at least a few Realtec titles that don't work because they use a funny mapper despite the fact that they aren't big enough to need one. It appears to be an anti-piracy measure which is rather ironic since they also made cartridge copiers.

TmEE co.(TM) · Post by **TmEE co.(TM)** » Fri Feb 02, 2007 8:49 am

Does these games work on the real thing ?

Stef · Post by **Stef** » Fri Feb 02, 2007 8:58 am

They do work but they contains additionnal hardware...

TmEE co.(TM) · Post by **TmEE co.(TM)** » Fri Feb 02, 2007 9:00 am

Well, if you want them to run on emus, you NEED to emulate the additional HW aswell if the games depend on it.

Post by **KanedaFr** » Fri Feb 02, 2007 9:01 am

like HAZE is doing...

TmEE co.(TM) · Post by **TmEE co.(TM)** » Fri Feb 02, 2007 9:02 am

What's HAZE ?

Post by **KanedaFr** » Fri Feb 02, 2007 9:59 am

see http://haze.mameworld.info/

TmEE co.(TM) · Post by **TmEE co.(TM)** » Fri Feb 02, 2007 1:09 pm

now I see...

If I'm going to make a commercial game, I will definately put extra HW on the cart, maybe even a MP3 decompressor chip (these are not very expensive anymore).