Emulator Cheats

My Berzerk taunts cheat was a machine code routine (see mame cheats section). I created code to hook the speech synthesis of Berzerk. I took every byte output from the hex file and pasted it into an XML file, byte for byte. The HEX file records the ORG (address) so you can compute the memory address...

I was wondering if there's any existing programs that will take an intel .HEX file and produce a MAME cheats XML with them?

If not, no worries, I will be able to code something like that up.

Here's the Z80 source for the cheat, if you want to add your own taunts. You can paste this direct into a Z80 project on ASM80 online to build. and produce the hex opcodes to make the cheat. The EQUs below are the unique IDs of the words that Berzerk supports. If you create derivative works from thi...

I've been reverse engineering Berzerk (http://seanriddle.com/berzerk.asm) and managed to work out how speech is generated. As a result, I've created some new taunts for the robots - 14 of them, to be precise. I think they make the game more fun. This will patch the COLOUR TEST code from $0200 onward...

Hi, I've created a new cheat that, I think, changes the gameplay to be more like Smash TV. Spheroids will now drop 5 GRUNTs at a time (until 15 or mor e GRUNTs are on screen), and loiter until destroyed. You need to use my "disable protection" cheat before you enable this one . BTW my disa...

Have added more cheats for you all. Have fun!

Have added an update as some users were experiencing game resets.

I've produced some more cheats for Robotron (Blue Label), derived from my reverse engineering work at www.seanriddle.com/robomame.asm *** FOUND PROTECTION RESET, NOW DISABLED *** The cheats allow you to customise the game somewhat. You must enable the "Disable protection" cheat before enab...

Hi, I've been reverse engineering Scramble @ www.seanriddle.com/scramble.asm As a result of my work I've got some cheats here if you would like them? I also included some things that make the game harder, such as indestructable UFOs and flying rockets. <cheat desc="Unstoppable bullets"> <s...

Hi, I've created some cheats for Galaxian if anyone is interested. I've merged my cheats with the current cheat file. My cheats start @ "Finish Level NOW!" . These are based off my disassembly work that can be found @ seanriddle.com/galaxian.asm Regards, Scott <mamecheat version="1&qu...

Am working on Gorf at the moment. I was wondering, is it possible in MAME to put a watch on a Z80 I/O port? For example, ports that read # of credits inserted, switches etc with the IN A, (C) instruction and OUT (C), A? etc. With memory mapped IO I can use WPSET, but I don't know what I can use for ...

Hi Pugsy, thanks for your advice. Am confused now (doesn't take much) :D I did see on Sean Riddle's site (http://seanriddle.com/willhard.html) that you can set reads to be from ROM or RAM though: "Memory address $C900 is used for a few miscellaneous things: bit 0 selects RAM or ROM in the memor...

A cheat I'm working on requires a patch to a ROM address at $4A02. In the MAME debugger, if I type: maincpu.mb@4A02 = 39 nothing happens. but if I type: maincpu.mb@ 1 4A02 = 39 then an RTS is inserted correctly and the patch is made. I'm using MAME 0.171, Feb 2016. The question I have is, how do you...

I'm currently reverse engineering Robotron 2084. My work is posted on Sean Riddle's site here: http://www.seanriddle.com/robomame.asm Most of my cheats are for testing patches, but here's some you might like. End current wave (Robotron Blue Label) - this one I just created 5 mins ago, with the lates...