24-bit computing in the context of Integer (computer science)

The W65C816S (also 65C816 or 65816) is a 16-bit microprocessor (MPU) developed and sold by the Western Design Center (WDC). Introduced in 1985, the W65C816S is an enhanced version of the WDC 65C02 8-bit MPU, itself a CMOS enhancement of the venerable MOS Technology 6502 NMOS MPU. The 65C816 is the CPU for the Apple IIGS and, in modified form, the Super Nintendo Entertainment System.

The 65 in the part's designation comes from its 65C02 compatibility mode, and the 816 signifies that the MPU has selectable 8- and 16-bit register sizes. In addition to the availability of 16-bit registers, the W65C816S extends memory addressing to 24 bits, supporting up to 16 megabytes of random-access memory. It has an enhanced instruction set and a 16-bit stack pointer, as well as several new electrical signals for improved system hardware management.

The Neo Geo (Greek for 'New World'), stylized as NEO•GEO, is a video game platform released in 1990 by Japanese game company SNK Corporation. It was initially released in two ROM cartridge-based formats: an arcade system board (Multi Video System; MVS) and a home video game console (Advanced Entertainment System; AES). A CD-ROM-based home console iteration, the Neo Geo CD, was released in 1994. The arcade system can hold multiple cartridges that can be exchanged out, a unique feature that contrasted to the dedicated single-game arcade cabinets of its time, making it popular with arcade operators.

The Neo Geo was marketed as the first 24-bit system; its CPU is actually a 16/32-bit 68000 with an 8-bit Z80 coprocessor, while its GPU chipset has a 24-bit graphics data bus. It was a very powerful system when released, more so than any video game console at the time, and many arcade systems such as rival Capcom's CPS, which did not surpass it until the CP System II in 1993.