Emulator Cheats

Posted: **Tue May 26, 2020 8:47 pm**

Hi ...The mmatrix cheat code for invincibility and infinite energy both aren't working on any version of mame including retroarch's versions...The console just spews out the following whenever it's enabled:

Code: Select all

Error executing expression "maincpu.pw@((maincpu.pd@FF49BC)+72)=0002": syntax error

(this is the one for invincibility, but the expression is the same as the infinite energy cheat)
What fixes the issue, it turns out, is to re-write these like so:

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  <cheat desc="P1 Invincibility">
    <script state="run">
      <action>temp0=maincpu.pd@FF49BC</action>
      <action>temp0=temp0+72</action>
      <action>maincpu.pw@temp0=0002</action>
<!--       <action>maincpu.pw@((maincpu.pd@FF49BC)+72)=0002</action> -->
    </script>
  </cheat>

I shared this issue with mamedev (https://github.com/mamedev/mame/issues/6742), but they claimed they didn't have an issue with the original expression...That leads me to think that they are on Windows and/or Mac where the syntax is permitted, indicating that Linux and/or anything linux derived (Arch/Manjaro/GCC 9/XML libs/etc) is doing something wrong, and causing more than just Mars Matrix cheats to fail as a result. I don't know what else could be causing this issue...

Posted: **Sat Jun 06, 2020 11:49 am**

The expression is perfectly valid. It works in the standard cheat engine and the LUA plugin cheat engine, so I suggest the problem lies with your build.

Have you tried the LUA plugin cheat engine?

I may replace the Invincibility cheat with a ROM cheat at some point to get rid of the standard Invincibility flicker.

Posted: **Sat Jun 06, 2020 6:19 pm**

...I don't know how to enable/use the lua plugin, and I don't know how mame should be built so that the mmatrix(et al) cheats (and cotton2/cotton boomerang's invincibility cheats) actually works

Emulator Cheats

Cheat XML Syntax VS Linux (Manjaro 19)/ GCC 9?

Cheat XML Syntax VS Linux (Manjaro 19)/ GCC 9?

Re: Cheat XML Syntax VS Linux (Manjaro 19)/ GCC 9?

Re: Cheat XML Syntax VS Linux (Manjaro 19)/ GCC 9?