314 lines
12 KiB
HTML
314 lines
12 KiB
HTML
<html>
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<head>
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<title>FCE Ultra Cheat Guide</title>
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</head>
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<body>
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<center><h1>FCE Ultra Cheat Guide</h1></center>
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<center><i>Last updated November 12, 2003<br />Valid as of FCE Ultra 0.97.4</i></center>
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<p>
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<b>Table of Contents:</b>
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<ul>
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<li><a href="#intro">Introduction</a>
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<ul>
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<li><a href="#cheatfiles">Cheat Files</a>
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</ul>
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<li><a href="#windows">The Windows Interface</a>
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<ul>
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<li><a href="#windows-search">Cheat Search Interface</a>
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</ul>
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<li><ba href="#text">The Text Interface(TODO)</ba>
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<li><a href="#examples">Examples</a>
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<ul>
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<li><a href="#examples-mm3">"Mega Man 3" Windows Example</a>
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<li><a href="#examples-oh">"Over Horizon" Text Interface Example</a>
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</ul>
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<li><a href="#tips">Tips</a>
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</ul>
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<hr width="100%">
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<a name="tips"><h2>Introduction</h2></a>
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<p>
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FCE Ultra allows cheating by the periodic "patching" of arbitrary addresses
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in the 6502's memory space with arbitrary values, as well as read substitution.
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"Read substitution" is the method that would be used on a real NES/Famicom,
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such as done by the Game Genie and Pro Action Replay. It is required
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to support GG and PAR codes, but since it is relatively slow when done
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in emulation, it is not the preferred method when a RAM patch will
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suffice. Also, in FCE Ultra, read substitution will not work properly with
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zero-page addressing modes(instructions that operate on RAM at $0000 through
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$00FF).
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</p>
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<p>
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The RAM patches are all applied a short time before the emulated
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vertical blanking period. This detail shouldn't concern most people, though.
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However, this does mean that cheating with games that use
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bank-switched RAM may be problematic. Fortunately, such games are not very
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common(in relation to the total number of NES and Famicom games).
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</p>
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<a name="cheatfiles"><h3>Cheat Files</h3></a>
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<p>
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Cheats are stored in the "cheats" subdirectory under the base FCE Ultra
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directory. The files are in a simple plain-text format. Each line represents
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a one-byte memory patch. The format is as follows(text in brackets []
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represents optional parameters):
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</p>
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<p>
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<blockquote>
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[S][C][:]Address(hex):Value(hex):[Compare value:]Description
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</blockquote>
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Example:
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<blockquote> 040e:05:Infinite super power.</blockquote>
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</p>
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<p>
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A colon(:) near the beginning of the line is used to disable the cheat.
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"S" denotes a cheat that is a read-substitute-style cheat(such as with Game
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Genie cheats), and a "C" denotes that the cheat has a compare value.
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</p>
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<hr width="100%">
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<a name="windows"><h2>The Windows Interface</h2></a>
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<p>
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All addresses listed in the cheats window are in unsigned
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16-bit hexadecimal format and all values in these windows are in an
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unsigned 8-bit decimal format(the range for values is 0 through 255).
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</p>
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<p>
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The cheats window contains the list of cheats for the currently loaded game
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on the right side. Existing cheats can be selected, edited, and updated
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using the "Update" button.
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</p>
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<a name="windows-search"><h3>Cheat Search Interface</h2></a>
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<p>
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The cheat search interface consists of several components: a list of
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addresses and associated data for a search, several command buttons,
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and the search parameters.
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</p>
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<p>
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Each entry in the list is in the format of:
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<blockquote>Address:Original Value:Current Value</blockquote>
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</p>
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<p>
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The address is the location in the 6502's address space, the original
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value is the value that was stored at this address when the search was
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reset, and the current value is the value that is currently stored at
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that address. Selecting an item in this list will automatically cause
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the "Address" field in the cheat information box on the right side of the
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window to be updated with the selected address.
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</p>
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<p>
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The "Reset Search" button resets the search process; all valid addresses
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are displayed in the cheat list and the data values at those addresses noted.
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</p>
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<p>
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The "Do Search" buttons performs a search based on the search parameters
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and removes any non-matching addresses from the address list.
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</p>
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<p>
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The "Set Original to Current" button sets the remembered original values
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to the current values. It is like the "Reset Search" button, but it does
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not affect which addresses are shown in the address list. This command is
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especially useful when used in conjunction with the "O!=C" search filter.
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</p>
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<p>
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The "Unhide Excluded" button shows all addresses that are excluded as a
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result of any previous searches. It is like the "Reset Search" button
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except that it does not affect the remembered original values.
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</p>
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<p>
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The numbers assigned the names "V1" and "V2" have different meanings based
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on which filter is selected. A list of the names of the filters and detailed
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information on what they do follows("original value" corresponds to the value
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remembered for a given addres and "current value" is the value currently
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at that address. Also, if a value is not explicitly said to be shown
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under a certain condition, then it is obviously excluded.):
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<p>
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"O==V1 && C==V2":
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<blockquote>
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Show the address if the original value is equal to "V1" AND
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the current value is equal to "V2".
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</blockquote>
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</p>
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<p>
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"O==V1 && |O-C|==V2":
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<blockquote>
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Show the address if the original value is equal to "V1" AND
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the difference between the current value and the original
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value is equal to "V2".
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</blockquote>
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</p>
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<p>
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"|O-C|==V2":
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<blockquote>
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Show the address if the difference between the current value
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and the original value is equal to "V2".
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</blockquote>
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</p>
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<p>
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"O!=C":
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<blockquote>
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Show the address if the original value does not equal the
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current value.
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</blockquote>
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</p>
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<p>
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The following cheat methods/filters automatically perform the function
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of the "Set Original to Current" button after "Do Search" is pressed.
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</p>
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<p>
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"Value decreased."
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<blockquote>
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Show the address if the value has decreased.
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</blockquote>
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</p>
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<p>
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"Value increased."
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<blockquote>
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Show the address if the value has increased.
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</blockquote>
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</p>
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<hr width="100%">
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<a name="examples"><h2>Examples</h2></a>
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<a name="examples-mm3"><h3>"Mega Man 3" Windows Example</h3></a>
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<p>
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This example will give Mega Man unlimited energy.
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Immediately after entering the Top Man stage, make your way to the
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"Add Cheat" window. Push "Reset Search".
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Go back to playing and move right until the first enemy appears. Allow
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yourself to be hit twice. Each hit does "2" damage, so you've lost 4 energy
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bars. Go to the "Add Cheat" window again and select the third filter
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("|O-C|==V2") and enter the value 4 next to "V2". Then push "Do Search".
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</p>
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<p>
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Several addresses will appear in the address list. You can try to find
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the address you want through trial and error, or you can narrow the results
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down further. We will do the latter.
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</p>
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<p>
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Go back to playing MM3 and get hit one more time and make your way back
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to the "Add Cheat" window. Your damage is now "6". You can probably
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see which address that contains your life(it is 00A2). If not, change
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V2 to 6 and push "Do Search" again. This should leave only 00A2.
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</p>
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<p>
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Select that entry in the address list. Shift your attention to the "Add
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Cheat" box to the right. Type in a meaningful name and the desired value(156;
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it was the value when you had no damage, so it's safe to assume it's the
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maximum value you can use). Push the "Add" button and a new entry will
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appear in the cheats list. The cheat has been added.
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</p>
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<a name="examples-oh"><h3>"Over Horizon" Text Interface Example</h3></a>
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<p>
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This example will give you infinite lives in the NTSC(Japanese) version
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of "Over Horizon".
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</p>
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<p>
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Start a new game. Notice that when you press "Start" during gameplay,
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the number of lives you have left is indicated. With no cheating, you
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start with 3 lives(2 lives left).
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</p>
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<p>
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Activate the cheat interface immediately after starting a new game.
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Select the "New Cheats" menu and "Reset Search".
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</p>
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<p>
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I'll assume that the number of lives left shown in the game is the same number
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that's stored in RAM. Now, "Do Search". You're going to use the first search
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filter. For V1, enter the value 2. For V2, enter the same value. This,
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coupled with the fact that you just reset the search, will allow you to search
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for a value "absolutely"(as opposed to changes in the value).
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</p>
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<p>
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Now, "Show Results". When I did it, I received 11 results:
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</p>
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<pre>
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1) $0000:002:002
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2) $001c:002:002
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3) $001e:002:002
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4) $009d:002:002
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5) $00b9:002:002
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6) $00e3:002:002
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7) $0405:002:002
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8) $0406:002:002
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9) $0695:002:002
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10) $07d5:002:002
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11) $07f8:002:002
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</pre>
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<p>
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You really can't do much yet(unless you want to spend time doing trial
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and error cheat additions). Return to the game.
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</p>
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<p>
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After losing a life, go back to the cheat interface, to the "New Cheats"
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menu, and "Show Results". Here are my results:
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</p>
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<pre>
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1) $0000:002:002
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2) $001c:002:002
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3) $001e:002:002
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4) $009d:002:002
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5) $00b9:002:041
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6) $00e3:002:002
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7) $0405:002:001
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8) $0406:002:002
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9) $0695:002:002
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10) $07d5:002:001
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11) $07f8:002:002
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</pre>
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<p>
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Notice that two addresses seem to hold the number of lives($0405 and
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$07d5). You can lose another life and go "Show Results" again, and you
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should see that $07d5 is the address that holds the number of lives.
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</p>
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<p>
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Now that you know the address that holds the number of lives, you can
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add a cheat. You can either type in the number from the cheat results list
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corresponding to the address you want to add a cheat for, or you can
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remember the address and select "Add Cheat" from the "New Cheats" menu.
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Do the former.
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</p>
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<p>
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Now you will need to enter a name for the cheat. I suggest something short,
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but descriptive. "Infinite lives" will work fine. Next, a prompt for
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the address will show up. Since you selected an item from the list, you
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can press enter to use the associated address($07d5). Next, you will
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need to enter a value. It doesn't need to be large(in fact, it probably
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shouldn't be; abnormally high numbers can cause some games to misbehave).
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I suggest a value of 2. After this, you should get a prompt that looks like
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this:
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</p>
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<pre>
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Add cheat "Infinite lives" for address $07d5 with value 002?(Y/N)[N]:
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</pre>
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<p>
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Answer "Y". You now have infinite lives.
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</p>
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<hr width="100%">
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<a name="tips"><h2>Tips</h2></a>
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<p>
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Games store player information in many different ways. For example,
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if you have "3" lives in Super Wacky Dodgeball 1989, the game might store
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it in memory as 2, 3, or 4, or perhaps a different number all together.
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Also, say that you have 69 life points out of 200 in Mole Mashers. The
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game might store how many life points you have, or how much damage you have
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taken. Relative value searches are very valuable because you probably
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don't know the way that the game stores its player data.
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</p>
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<p>
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Some games, especially RPGs, deal with individual numbers greater than
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8-bits in size. Most that I've seen seem to store the multiple-byte data
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least significant byte(lower byte of number) first in memory, though
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conceivably, it could be stored most significant byte first, or the component
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bytes of the number could be non-contiguous, though the latter is very unlikely.
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For example, say I have 5304 experience points in Boring Quest for the
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Overused Plot Device. To split the number into two eight bit decimal numbers,
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take 5304 %(modulus) 256. This will give a number that is the lower 8 bits.
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Next, take 5304 / 256. The integral component of your answer will be the
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upper 8 bits(or the next 8 bits, if the number is or can be larger than 16
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bits) of 5304. Now you will need to search for these numbers. Fortunately,
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most(all?) RPGs seem to store large numbers exactly as they are shown in the
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game.
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</p>
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</body>
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</html>
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