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eyeangle



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22nd January, 2008 at 04:38:44 -

I find myself play Wonderboy in Monsterland on a Sega Master System emulator and thought wouldn't it be cool if I could start with 9999 gold. So I opened up the rom as a *.txt file. And there was jibberish writing all over the place. I found place where there was writing like 'HEY BRAVE ONE.' But I couldn't find anywhere to edit the gold amount. I download Hex Edit and it cleaned it up a bit but is there anyway to do such a thing?

 
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Tim

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22nd January, 2008 at 09:04:01 -

Depending on your emulator, which I presume is Gens?.. You can just use the menus to enable cheats.. Openning up the actual ROM file wont do much good, since if you were to alter one character the rom will fail.

 
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X_Sheep

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22nd January, 2008 at 09:45:20 -

Gens doesn't run Master System I think.

 
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Hernan



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22nd January, 2008 at 10:04:43 -

Technically, it's possible to do it by hacking the rom. You'll need a lot of knowledge of romhacking and ASM, so I wouldn't recommend it. Like Tim says, try a cheat code using an emulator.

 
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Kirby Smith

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22nd January, 2008 at 10:32:03 -

Any Genesis emulator should be able to emulate the Master System. If I recall, the Genesis hardware was backwardly compatible as long as you had a converter so you could plug the carts in.

 
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Dr. James MD

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22nd January, 2008 at 10:57:09 -

That's true. IIRC the Mega Drive or Master System also had an adapter to play Game Gear carts too.

Ps. How do you say Mjolnir?

 
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DeadmanDines

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22nd January, 2008 at 11:01:26 -

The emulator may have a code generator, I know some SNES ones do.

I got loads of cool new codes for A Link to the Past using that. EG:

1. Start with 54 rupees.
2. Using the built in code finder, search the memory for any sections that store a value of 54.
3. A list of about 50 values should come up.
4. Go back to the game, pick up a rupee, making it 55 rupees.
5. Back to the mem searcher, and run a second search for 55.
6. This searches tha values that were previously set to 54, to see which ones are now at 55.
7. Keep doing this, spending and gaining rupees until you have narrowed it down to just one value.
8. Voila! Now add that code as a cheat code and set it to whatever you want.


Hopefully, the master system emulator will have a feature to do this.

 
191 / 9999 * 7 + 191 * 7

AndyUK

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22nd January, 2008 at 11:34:35 -

To hack the roms you need to know how the game is programmed. You can learn via trial and error by changing values in a Hex editor.
Alternatively There might actually be some websites devoted to this already.

or you could find an assembler.
knowledge on Z80 language would be quite helpful (since thats the processor Master systems used)

 
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DaVince

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22nd January, 2008 at 13:34:39 -


Originally Posted by Edwin Street
I find myself play Wonderboy in Monsterland on a Sega Master System emulator and thought wouldn't it be cool if I could start with 9999 gold. So I opened up the rom as a *.txt file.


Do you always open files that are sure to contain binary data rather than ASCII data with a regular text editing tool?

 
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Phredreeke

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22nd January, 2008 at 13:44:22 -


Originally Posted by DaVince [Ectoprods]

Originally Posted by Edwin Street
I find myself play Wonderboy in Monsterland on a Sega Master System emulator and thought wouldn't it be cool if I could start with 9999 gold. So I opened up the rom as a *.txt file.


Do you always open files that are sure to contain binary data rather than ASCII data with a regular text editing tool?



Actually some ROMs do contain ASCII data. For example several of the 8-bit Sonics store the level names used in the level select as ASCII.

 
- Ok, you must admit that was the most creative cussing this site have ever seen -

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DaVince

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22nd January, 2008 at 13:57:18 -

Of course there's some ASCII data in some ROMs to store game text, but that's as far as it goes really.

 
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Phredreeke

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22nd January, 2008 at 14:20:20 -


Originally Posted by Kirby Smith
Any Genesis emulator should be able to emulate the Master System. If I recall, the Genesis hardware was backwardly compatible as long as you had a converter so you could plug the carts in.



Well, the Megadrive (that's what europeans call the Genesis) VDP supports the SMS graphic mode but since no Megadrive game uses it, very few emulators bother emulating it. Similarly the SMS VDP supports the SG-1000 (a japan only console Sega made before SMS) graphics modes, but early SMS emulators didn't bother with that either (which is why F-16 Fighter doesn't work with those, that being the only SMS game using SG-1000 graphics modes... and for a good reason, it looks pretty awful).


Originally Posted by Dr. James
That's true. IIRC the Mega Drive or Master System also had an adapter to play Game Gear carts too.



Game Gear had an adapter to play Master System carts, but neither Mega Drive nor Master System could play Game Gear carts.

 
- Ok, you must admit that was the most creative cussing this site have ever seen -

Make some more box arts damnit!
http://create-games.com/forum_post.asp?id=285363

Tim

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22nd January, 2008 at 15:34:30 -


Originally Posted by Dr. James

Ps. How do you say Mjolnir?



"Muh-djowl-neer"?

Not much clearer, I know I'd try to avoid ever saying it out loud personally, but if I had too it'd be like that...
<_<
>_>

 
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AndyUK

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22nd January, 2008 at 15:48:48 -


Originally Posted by Phredreeke

Originally Posted by Kirby Smith
Any Genesis emulator should be able to emulate the Master System. If I recall, the Genesis hardware was backwardly compatible as long as you had a converter so you could plug the carts in.



Well, the Megadrive (that's what europeans call the Genesis) VDP supports the SMS graphic mode but since no Megadrive game uses it, very few emulators bother emulating it. Similarly the SMS VDP supports the SG-1000 (a japan only console Sega made before SMS) graphics modes, but early SMS emulators didn't bother with that either (which is why F-16 Fighter doesn't work with those, that being the only SMS game using SG-1000 graphics modes... and for a good reason, it looks pretty awful).


Originally Posted by Dr. James
That's true. IIRC the Mega Drive or Master System also had an adapter to play Game Gear carts too.



Game Gear had an adapter to play Master System carts, but neither Mega Drive nor Master System could play Game Gear carts.



Also the Megadrive (Genesis) uses the Z80 prcessor as a sound processor, so really you shouldn't need an adaptor to play the games at all on the real hardware, although the carts would'nt fit without one.

The adaptors however allowed old Master system 1 card games to be played too.

 
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NeoMonkey

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3rd February, 2008 at 08:34:52 -

Hack with cheat engine, works for any game, emulato and even some browser games. You can hack everything with that.

 
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Dr. James MD

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3rd February, 2008 at 08:46:53 -

This is going to pickle my brain then. A friend used to have a Master System 2 (I think it was) and it had some odd adapter that you could plug into the cart port. He said it was used to play Game Gear games *shrug*. Looked like a Spectrum memory expansion pack.

 
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Knudde (Shab)

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3rd February, 2008 at 13:14:24 -

Yeah, the SMS and the GG were essentially the same hardware. There was also a reverse adaptor that allowed you to play Master System games on the GG.

 
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Phredreeke

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3rd February, 2008 at 13:32:36 -

You can play SMS games on GG but not reverse.

The GG has an extended palette, if you want to play a GG game on SMS you have to hack the game to use valid SMS palette entries. Also the GG has an additional button not on the SMS controller, the Start button. Which means another thing you have to hack.

The GG doesn't use the whole screen, it still has 256x192 pixels (like SMS) in memory but it only displays 160x144 of those on screen. Outside those pixels you may have pretty much anything. Could be perfectly useful level graphics, but it may just as well be garbage.

 
- Ok, you must admit that was the most creative cussing this site have ever seen -

Make some more box arts damnit!
http://create-games.com/forum_post.asp?id=285363

Bibin

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3rd February, 2008 at 19:57:36 -

Well said. Often, GG games that were converted from SMS games can, in many emulators, have the border removed, to find that the game is nearly identical to the SMS game, as everything beyond the border is still visible.

 
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AndyUK

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4th February, 2008 at 10:52:00 -

You'll find that most of the games that appeared on both systems don't make much use of the Game gears extended palette. Only exclusive Game gear games like Ristar or Sonic Triple trouble have a noticeably higher colour count.

Image Edited by the Author.

 
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