Nintendo 64 Remote Debugger
To build a release version
To build a debug version
$ scons debug=1
$ scons -c
$ n64rd -h n64rd v0.2 By Parasyte (firstname.lastname@example.org) Website: http://www.kodewerx.org/ Build date: Aug 10 2014, 12:31:45 Usage: n64rd [options] Options: -h Print usage and quit. -p <port> Specify port number (default 0x378). Linux systems with PPDev can use a path. e.g. "/dev/parport0" -v Detect GS firmware version. -a <address> Specify address (default 0x80000000). -l <length> Specify length (default 0x00400000). -d[file] Dump memory 32-bits at a time; Copy <length> bytes from memory <address> (to [file]). -r[file] Read memory; Copy <length> bytes from memory <address> (to [file]). -w <file> Write memory; Copy from <file> to memory <address>. -u <file> Upgrade ROM with given file.
Points of Interest
The main differences between the
-d options are:
-rreads one byte at a time.
-dreads one word at a time. This makes
-dsuitable for reading from ROM space, while
-ris restricted to reading valid addresses only. The "invalid" address ranges are listed below.
-dis completely unrestricted; they didn't even try!
-rkeeps the game paused when it is finished.
-dunpauses immediately when finished.
-rcan only be used in-game.
-dcan be used in the menu or in-game.
Invalid read ranges
0x80780000 - 0x807FFFFF 0xBDFFFFFF - 0xFFFFFFFF
Note that the mirrored address range 0xA0780000 - 0xA07FFFFF is VALID, so it can be read easily. It also does not take into account the length of the data being read. Therefore it's possible to read these invalid ranges by starting at a lower address and reading more data. Reading 0x80000000 - 0x807FFFFF is perfectly acceptable. (Something, something horrible programming.)
If it sounds like the
-d option is more useful, you're probably right. The
only exception is when you want to read memory but leave the game paused. And
that is easy to patch into the
-d options, anyway. (Patches are forthcoming!)
Dumping N64 ROMs
Dump the cartridge ROM with:
$ ./n64rd -dgame.n64 -a 0xB0000000 -l 0x0E000000
You will then have game.n64 file that is 224MB in size. This should be large
enough for ANY N64 ROM. But it will be way too much for the majority of games.
The ROM data will repeat in well-defined intervals. You can adjust
-l to save
a lot of time, if you know the exact ROM size.
Dumping the GS ROM
Dump the GS ROM with:
$ ./n64rd -dgs.n64 -a 0xBEC00000 -l 0x00040000