robotank hack request

[bradhig]

could someone hack robotank so you have unlimited tanks?

 

also unlimted lives in hero

[+Atarius Maximus]

Unfortunately both of those games are 8K, so they're not easily disassembled. If there are any other 2-4K games you'd like to see "unlimited lives" for, let me know and I'll take a look at them.

 

AM

[supercat]

Unfortunately both of those games are 8K, so they're not easily disassembled.

911722[/snapback]

 

I hacked Montezuma's Revenge for unlimitted lives using the handy trace-log function of Z26. Took a few iterations to figure everything out, but the basic concept isn't too bad. Start the game and turn on logging briefly to capture a few frames worth of execution. Then use a text-file viewer to find where VBLANK is turned off, then search for the first write to GRP0. Figure out what part of the screen that corresponds to, then estimate what scan line the 'lives' indicator appears. Search down through the file until you find the executing code for that scan line and search until you find what looks like the lives-counter display code. Once that is found, lose a life and capture a few more frames worth of data. The lives counter display code should run with a smaller number. If this works, turn on logging while you lose the next life. Then search for accesses to that life counter. Once you have identified the instruction that modifies it, you should be able to find that same instruction in the file; if the instruction was at $1234, the instruction in the file will probably be at offset $0234 or $1234, or possibly $0A34 or $1A34.

 

One caveat is that you may have to tell Z26 what bank-switching scheme to use after you hack the cart, since the checksum will no longer match anything Z26 knows about.

[+batari]

One caveat is that you may have to tell Z26 what bank-switching scheme to use after you hack the cart, since the checksum will no longer match anything Z26 knows about.

915063[/snapback]

Not if you use the Robot Tank I converted to F8 bankswitching...

[NE146]

On the xbox I actually put in a cheat (using the cheat search feature) to do just that.. have unlimited lives in Robotank. I maxed it out.