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ROM hacking (short for Read-only memory hacking) is the process of modifying a ROM image or ROM file to alter the contents contained within, usually of a video game to alter the game's graphics, dialogue, levels, gameplay, and/or other elements.
Intelligent Systems ROM burner for the Nintendo DS. A ROM image, or ROM file, is a computer file which contains a copy of the data from a read-only memory chip, often from a video game cartridge, or used to contain a computer's firmware, or from an arcade game's main board.
A microcode update populates a separate SRAM and set of "match registers" that act as breakpoints within the microcode ROM, to allow jumping to the updated list of micro-operations in the SRAM. [1] A match is performed between the Microcode Instruction Pointer (UIP) all of the match registers, with any match resulting in a jump to the ...
The GSU-1 however runs at the full 21.47 MHz. Both the MARIO CHIP 1 and the GSU-1 can support a maximum ROM size of 8 Mbits. The design was revised to the GSU-2, which is still 16-bit, but this version can support a ROM size greater than 8 Mbit. The final known revision is the GSU-2-SP1.
A few computers were built using writable microcode. In this design, rather than storing the microcode in ROM or hard-wired logic, the microcode is stored in a RAM called a writable control store or WCS. Such a computer is sometimes called a writable instruction set computer (WISC). [45]
Firmware hacks usually take advantage of the firmware update facility on many devices to install or run themselves. Some, however, must resort to exploits to run, because the manufacturer has attempted to lock the hardware to stop it from running unlicensed code. Most firmware hacks are free software.
Homebrew, when applied to video games, refers to software produced by hobbyists for proprietary video game consoles which are not intended to be user-programmable. The official documentation is often only available to licensed developers, and these systems may use storage formats that make distribution difficult, such as ROM cartridges or encrypted CD-ROMs.
A control store is the part of a CPU's control unit that stores the CPU's microprogram.It is usually accessed by a microsequencer.A control store implementation whose contents are unalterable is known as a Read Only Memory (ROM) or Read Only Storage (ROS); one whose contents are alterable is known as a Writable Control Store (WCS).