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-\r
-\r
- FCE Ultra Cheat Guide\r
-\r
-***** This file was obtained from *****\r
-http://mednafen.com/documentation/cheat.html\r
-\r
-\r
-/Last updated November 12, 2003\r
-Valid as of FCE Ultra 0.97.4/\r
-\r
-*Table of Contents:*\r
-\r
- * Introduction <#intro>\r
- o Cheat Files <#cheatfiles> \r
- * The Windows Interface <#windows>\r
- o Cheat Search Interface <#windows-search> \r
- * The Text Interface(TODO)\r
- * Examples <#examples>\r
- o "Mega Man 3" Windows Example <#examples-mm3>\r
- o "Over Horizon" Text Interface Example <#examples-oh> \r
- * Tips <#tips> \r
-\r
-------------------------------------------------------------------------\r
-\r
-\r
- Introduction\r
-\r
-FCE Ultra allows cheating by the periodic "patching" of arbitrary\r
-addresses in the 6502's memory space with arbitrary values, as well as\r
-read substitution. "Read substitution" is the method that would be used\r
-on a real NES/Famicom, such as done by the Game Genie and Pro Action\r
-Replay. It is required to support GG and PAR codes, but since it is\r
-relatively slow when done in emulation, it is not the preferred method\r
-when a RAM patch will suffice. Also, in FCE Ultra, read substitution\r
-will not work properly with zero-page addressing modes(instructions that\r
-operate on RAM at $0000 through $00FF).\r
-\r
-The RAM patches are all applied a short time before the emulated\r
-vertical blanking period. This detail shouldn't concern most people,\r
-though. However, this does mean that cheating with games that use\r
-bank-switched RAM may be problematic. Fortunately, such games are not\r
-very common(in relation to the total number of NES and Famicom games).\r
-\r
-\r
- Cheat Files\r
-\r
-Cheats are stored in the "cheats" subdirectory under the base FCE Ultra\r
-directory. The files are in a simple plain-text format. Each line\r
-represents a one-byte memory patch. The format is as follows(text in\r
-brackets [] represents optional parameters):\r
-\r
- [S][C][:]Address(hex):Value(hex):[Compare value:]Description \r
-\r
-Example:\r
-\r
- 040e:05:Infinite super power.\r
-\r
-A colon(:) near the beginning of the line is used to disable the cheat.\r
-"S" denotes a cheat that is a read-substitute-style cheat(such as with\r
-Game Genie cheats), and a "C" denotes that the cheat has a compare value.\r
-\r
-------------------------------------------------------------------------\r
-\r
-\r
- The Windows Interface\r
-\r
-All addresses listed in the cheats window are in unsigned 16-bit\r
-hexadecimal format and all values in these windows are in an unsigned\r
-8-bit decimal format(the range for values is 0 through 255).\r
-\r
-The cheats window contains the list of cheats for the currently loaded\r
-game on the right side. Existing cheats can be selected, edited, and\r
-updated using the "Update" button.\r
-\r
-\r
- Cheat Search Interface\r
-\r
-The cheat search interface consists of several components: a list of\r
-addresses and associated data for a search, several command buttons, and\r
-the search parameters.\r
-\r
-Each entry in the list is in the format of:\r
-\r
- Address:Original Value:Current Value\r
-\r
-The address is the location in the 6502's address space, the original\r
-value is the value that was stored at this address when the search was\r
-reset, and the current value is the value that is currently stored at\r
-that address. Selecting an item in this list will automatically cause\r
-the "Address" field in the cheat information box on the right side of\r
-the window to be updated with the selected address.\r
-\r
-The "Reset Search" button resets the search process; all valid addresses\r
-are displayed in the cheat list and the data values at those addresses\r
-noted.\r
-\r
-The "Do Search" buttons performs a search based on the search parameters\r
-and removes any non-matching addresses from the address list.\r
-\r
-The "Set Original to Current" button sets the remembered original values\r
-to the current values. It is like the "Reset Search" button, but it does\r
-not affect which addresses are shown in the address list. This command\r
-is especially useful when used in conjunction with the "O!=C" search\r
-filter.\r
-\r
-The "Unhide Excluded" button shows all addresses that are excluded as a\r
-result of any previous searches. It is like the "Reset Search" button\r
-except that it does not affect the remembered original values.\r
-\r
-The numbers assigned the names "V1" and "V2" have different meanings\r
-based on which filter is selected. A list of the names of the filters\r
-and detailed information on what they do follows("original value"\r
-corresponds to the value remembered for a given addres and "current\r
-value" is the value currently at that address. Also, if a value is not\r
-explicitly said to be shown under a certain condition, then it is\r
-obviously excluded.):\r
-\r
-"O==V1 && C==V2":\r
-\r
- Show the address if the original value is equal to "V1" AND the\r
- current value is equal to "V2". \r
-\r
-"O==V1 && |O-C|==V2":\r
-\r
- Show the address if the original value is equal to "V1" AND the\r
- difference between the current value and the original value is equal\r
- to "V2". \r
-\r
-"|O-C|==V2":\r
-\r
- Show the address if the difference between the current value and the\r
- original value is equal to "V2". \r
-\r
-"O!=C":\r
-\r
- Show the address if the original value does not equal the current\r
- value. \r
-\r
-The following cheat methods/filters automatically perform the function\r
-of the "Set Original to Current" button after "Do Search" is pressed.\r
-\r
-"Value decreased."\r
-\r
- Show the address if the value has decreased. \r
-\r
-"Value increased."\r
-\r
- Show the address if the value has increased. \r
-\r
-------------------------------------------------------------------------\r
-\r
-\r
- Examples\r
-\r
-\r
- "Mega Man 3" Windows Example\r
-\r
-This example will give Mega Man unlimited energy. Immediately after\r
-entering the Top Man stage, make your way to the "Add Cheat" window.\r
-Push "Reset Search". Go back to playing and move right until the first\r
-enemy appears. Allow yourself to be hit twice. Each hit does "2" damage,\r
-so you've lost 4 energy bars. Go to the "Add Cheat" window again and\r
-select the third filter ("|O-C|==V2") and enter the value 4 next to\r
-"V2". Then push "Do Search".\r
-\r
-Several addresses will appear in the address list. You can try to find\r
-the address you want through trial and error, or you can narrow the\r
-results down further. We will do the latter.\r
-\r
-Go back to playing MM3 and get hit one more time and make your way back\r
-to the "Add Cheat" window. Your damage is now "6". You can probably see\r
-which address that contains your life(it is 00A2). If not, change V2 to\r
-6 and push "Do Search" again. This should leave only 00A2.\r
-\r
-Select that entry in the address list. Shift your attention to the "Add\r
-Cheat" box to the right. Type in a meaningful name and the desired\r
-value(156; it was the value when you had no damage, so it's safe to\r
-assume it's the maximum value you can use). Push the "Add" button and a\r
-new entry will appear in the cheats list. The cheat has been added.\r
-\r
-\r
- "Over Horizon" Text Interface Example\r
-\r
-This example will give you infinite lives in the NTSC(Japanese) version\r
-of "Over Horizon".\r
-\r
-Start a new game. Notice that when you press "Start" during gameplay,\r
-the number of lives you have left is indicated. With no cheating, you\r
-start with 3 lives(2 lives left).\r
-\r
-Activate the cheat interface immediately after starting a new game.\r
-Select the "New Cheats" menu and "Reset Search".\r
-\r
-I'll assume that the number of lives left shown in the game is the same\r
-number that's stored in RAM. Now, "Do Search". You're going to use the\r
-first search filter. For V1, enter the value 2. For V2, enter the same\r
-value. This, coupled with the fact that you just reset the search, will\r
-allow you to search for a value "absolutely"(as opposed to changes in\r
-the value).\r
-\r
-Now, "Show Results". When I did it, I received 11 results:\r
-\r
- 1) $0000:002:002\r
- 2) $001c:002:002\r
- 3) $001e:002:002\r
- 4) $009d:002:002\r
- 5) $00b9:002:002\r
- 6) $00e3:002:002\r
- 7) $0405:002:002\r
- 8) $0406:002:002\r
- 9) $0695:002:002\r
- 10) $07d5:002:002 \r
- 11) $07f8:002:002\r
-\r
-You really can't do much yet(unless you want to spend time doing trial\r
-and error cheat additions). Return to the game.\r
-\r
-After losing a life, go back to the cheat interface, to the "New Cheats"\r
-menu, and "Show Results". Here are my results:\r
-\r
- 1) $0000:002:002\r
- 2) $001c:002:002\r
- 3) $001e:002:002\r
- 4) $009d:002:002\r
- 5) $00b9:002:041\r
- 6) $00e3:002:002\r
- 7) $0405:002:001\r
- 8) $0406:002:002\r
- 9) $0695:002:002\r
- 10) $07d5:002:001\r
- 11) $07f8:002:002\r
-\r
-Notice that two addresses seem to hold the number of lives($0405 and\r
-$07d5). You can lose another life and go "Show Results" again, and you\r
-should see that $07d5 is the address that holds the number of lives.\r
-\r
-Now that you know the address that holds the number of lives, you can\r
-add a cheat. You can either type in the number from the cheat results\r
-list corresponding to the address you want to add a cheat for, or you\r
-can remember the address and select "Add Cheat" from the "New Cheats"\r
-menu. Do the former.\r
-\r
-Now you will need to enter a name for the cheat. I suggest something\r
-short, but descriptive. "Infinite lives" will work fine. Next, a prompt\r
-for the address will show up. Since you selected an item from the list,\r
-you can press enter to use the associated address($07d5). Next, you will\r
-need to enter a value. It doesn't need to be large(in fact, it probably\r
-shouldn't be; abnormally high numbers can cause some games to\r
-misbehave). I suggest a value of 2. After this, you should get a prompt\r
-that looks like this:\r
-\r
- Add cheat "Infinite lives" for address $07d5 with value 002?(Y/N)[N]:\r
-\r
-Answer "Y". You now have infinite lives.\r
-\r
-------------------------------------------------------------------------\r
-\r
-\r
- Tips\r
-\r
-Games store player information in many different ways. For example, if\r
-you have "3" lives in Super Wacky Dodgeball 1989, the game might store\r
-it in memory as 2, 3, or 4, or perhaps a different number all together.\r
-Also, say that you have 69 life points out of 200 in Mole Mashers. The\r
-game might store how many life points you have, or how much damage you\r
-have taken. Relative value searches are very valuable because you\r
-probably don't know the way that the game stores its player data.\r
-\r
-Some games, especially RPGs, deal with individual numbers greater than\r
-8-bits in size. Most that I've seen seem to store the multiple-byte data\r
-least significant byte(lower byte of number) first in memory, though\r
-conceivably, it could be stored most significant byte first, or the\r
-component bytes of the number could be non-contiguous, though the latter\r
-is very unlikely. For example, say I have 5304 experience points in\r
-Boring Quest for the Overused Plot Device. To split the number into two\r
-eight bit decimal numbers, take 5304 %(modulus) 256. This will give a\r
-number that is the lower 8 bits. Next, take 5304 / 256. The integral\r
-component of your answer will be the upper 8 bits(or the next 8 bits, if\r
-the number is or can be larger than 16 bits) of 5304. Now you will need\r
-to search for these numbers. Fortunately, most(all?) RPGs seem to store\r
-large numbers exactly as they are shown in the game.\r
-\r
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