Emulator Cheats

Here's to unlock the extra stage without the complex code entry <mamecheat version="1"> <cheat desc="Unlock Extra Stage"> <script state="on"> <action>maincpu.pb@80282c72=maincpu.pb@80282c72|20</action> </script> </cheat> </mamecheat>

Ask over at the github repo. https://github.com/mamedev/mame/issues

A plugin starts before anything is loaded. You need to use register_start to get a callback once the emulation starts.

> [MAME]> manager.machine.devices[":maincpu"].spaces["program"].install_read_tap(0x2000,0x2fff,"test",foo())
foo() is calls foo and install_read_tap gets the return value from foo() (nil) as the tap callback function.

What are you trying to do? That's beyond the scope of cheats but luaengine supports adding taps which can allow you to get a callback when a memory region is accessed.

Does it work if you put pce_cd/fraycd instead? If it doesn't try that with this patch: diff --git a/plugins/cheat/init.lua b/plugins/cheat/init.lua index 896fc1e101b..bc581b42b35 100644 --- a/plugins/cheat/init.lua +++ b/plugins/cheat/init.lua @@ -92,17 +92,21 @@ function cheat.startplugin() local i...

What do you mean it won't load back in? What does it do when you try to use it?

I was hoping that wouldn't happen but thankfully it's not a big problem. Screen height is a property now so changing screen:height() to screen.height should fix it.

Lua cheats are part of the cheat package. If you use the plugin they will be listed in the Plugins-Cheats menu otherwise they are ignored.

Get https://raw.githubusercontent.com/mamed ... t/init.lua and put it int your plugins/cheat folder.

This was fixed after release. Get https://raw.githubusercontent.com/mamed ... at_xml.lua and put it in your plugins/cheat directory.

Sega cd rom cheats don't make sense. I don't know the old cheat format but I suspect the two latter ones are ram cheats in the sega cd address space, maybe use segacd:segacd_68k

Interesting. You could write a script for the lua plugin that would load the hex patches directly but the result would only be usable with the plugin, otherwise there isn't any existing mame feature to convert intel hex files to xml cheats.

As far as I know there's nothing like that anywhere. I'd like to know what you are trying to do though because I'm not sure what kind of cheats you could get from a hex object file.

Heihachi_73 wrote: ↑Fri Sep 11, 2020 10:20 pm MAME has a built-in autofire menu which becomes available when cheats are enabled,

Was removed. You have to use "-plugin autofire" and configure it in the "Plugin options" menu.

For now I made it a -verbose warning.

Is it possible to change the way it works so that it looks for a match using the 32K block size first (58ef,d8ef,158ef,1d8ef etc) and then falls back to a 8K block size (18ef, 38ef, 58ef, 78ef etc) if it can't find a compare value match on the 32k block size. Sure, this isn't hard. What to do with ...

[{ "script":{ "on":"maincpu.bpset(0x470e, function() cpup:write_u8(0xff84b6, 2) cpup:write_u8(0xff84b8, 1) end)" "off":"" }, "desc":"P1 Infinite throw range", "space":{ "cpup":{ "type":"program&...

The lua cheat engine supports breakpoints (https://github.com/mamedev/mame/blob/b29288964f074dd08d47c08c35463c2a4a1186dd/plugins/cheat/init.lua#L63 https://github.com/mamedev/mame/blob/b29288964f074dd08d47c08c35463c2a4a1186dd/plugins/cheat/init.lua#L295) with 2 caveats 1. the debugger must be enable...

This isn't possible in a general way. It is potentially possible for all the software on a particular hardware platform in lua but not with the cheat engine or finder.