Search found 9 matches

by Spindaboy
Tue Jul 31, 2018 12:38 am
Forum: Newbie Help Center
Topic: Editing ROM Instructions/ Creating Game Genie Codes?
Replies: 21
Views: 8240

Re: Editing ROM Instructions/ Creating Game Genie Codes?

I ran the Japanese rom and it reads and then writes here: 00:9C71:BD 80 8F LDA $8F80,X @ $8FA0 = #$0A >00:9C74:9D 00 61 STA $6100,X @ $6120 = #$00 Which is part of a bigger sort of copying of data from ROM to PRG-RAM: 00:9C6F:A2 3F LDX #$3F 00:9C71:BD 80 8F LDA $8F80,X @ $8FA0 = #$0A >00:9C74:9D 00...
by Spindaboy
Sat Jul 14, 2018 9:46 pm
Forum: Newbie Help Center
Topic: Editing ROM Instructions/ Creating Game Genie Codes?
Replies: 21
Views: 8240

Re: How to find RAM addresses/ How to make Game Genie Codes?

So after doing a bit of messing around in the debugger and I've found some offsets and values that I'm looking for, but that's about the extent to which I can use the debugger right now. I still don't understand how to use breakpoints, the (assembly?) code in the following column, or pretty much any...
by Spindaboy
Sat Jul 14, 2018 7:52 pm
Forum: Newbie Help Center
Topic: Editing ROM Instructions/ Creating Game Genie Codes?
Replies: 21
Views: 8240

Re: How to find RAM addresses/ How to make Game Genie Codes?

But, to answer your question... (I used to make game genie codes as a hobby.) Basically, when the CPU reads a byte from a specific location in the ROM, instead of getting that byte, you can force it to see another byte. like if the game code says... Load the #5 and store it at the "lives left" RAM ...
by Spindaboy
Sat Jul 14, 2018 7:50 pm
Forum: Newbie Help Center
Topic: Editing ROM Instructions/ Creating Game Genie Codes?
Replies: 21
Views: 8240

Re: How to find RAM addresses/ How to make Game Genie Codes?

Ok. First, have you tried any of the game specific tools over at Romhacking.net? Such as... https://www.romhacking.net/utilities/163/ Also, lots of info at the datacrystal database... http://datacrystal.romhacking.net/wiki/Category:Final_Fantasy_Series Click on the RAM MAP on each game. I'm familia...
by Spindaboy
Sat Jul 14, 2018 7:24 pm
Forum: Newbie Help Center
Topic: Editing ROM Instructions/ Creating Game Genie Codes?
Replies: 21
Views: 8240

Re: How to find RAM addresses/ How to make Game Genie Codes?

Are you asking how the MMC5 mapper works (very few games had...Castlevania 3 was one)? Or how game genie works? Actually, scratch that. I'm suddenly reminded that MMC5 is buggy with the game genie, and you can't even see the game genie code entry screen. All I need to know is the best method for ed...
by Spindaboy
Sat Jul 14, 2018 7:14 pm
Forum: Newbie Help Center
Topic: Editing ROM Instructions/ Creating Game Genie Codes?
Replies: 21
Views: 8240

Re: How to find RAM addresses/ How to make Game Genie Codes?

dougeff wrote:Actually, MMC5 can map WRAM to banks above $8000. I guess, in theory you can modify RAM with a game genie.
Can you explain how please?
by Spindaboy
Sat Jul 14, 2018 7:07 pm
Forum: Newbie Help Center
Topic: Editing ROM Instructions/ Creating Game Genie Codes?
Replies: 21
Views: 8240

Re: How to find RAM addresses/ How to make Game Genie Codes?

This doesn't sound very promising... so what would the best course of action be?
by Spindaboy
Sat Jul 14, 2018 6:39 pm
Forum: Newbie Help Center
Topic: Editing ROM Instructions/ Creating Game Genie Codes?
Replies: 21
Views: 8240

Re: How to find RAM addresses/ How to make Game Genie Codes?

I'm pretty sure that Game Genie codes modify ROM, not RAM. I believe you are correct. But you might be able to intercept RAM values if the game cartridge maps RAM into $8000-$FFFF (although most cartridges don't do that). So if that's the case, then I would have to input any stat-altering codes bef...
by Spindaboy
Sat Jul 14, 2018 6:03 pm
Forum: Newbie Help Center
Topic: Editing ROM Instructions/ Creating Game Genie Codes?
Replies: 21
Views: 8240

Editing ROM Instructions/ Creating Game Genie Codes?

I'd like to locate and edit certain RAM values for FF I, II, and III, but am not sure how to go about doing so. This question might be a bit complex so I apologize in advance! Firstly, I'm not sure I understand exactly how Game Genie overwrites the values. Correct me if I'm wrong, but doesn't Game G...