MOS Technology 65xx refers to a family of 8-bit microprocessors from MOS Technology, based on the Motorola 6800 (introduced ca. 1975).
 The 65xx family most notably included the 6502, used in several home computers such as the Commodore PET and VIC-20, the Apple II, and the Atari 800.
 A British computer that used the 6502 was the BBC Micro, manufactured by Acorn, Ltd.
The HuC6280 8-bit microprocessor is Japanese company Hudson Soft's improved version of the WDC 65C02 CPU, an upgraded CMOS version of the popular NMOS-based MOS Technology 6502 8-bit CPU manufactured for Hudson by Seiko Epson.
 The most notable product using the HuC6280 is NEC's PC Engine video game console.
The Western Design Center (WDC), located in Mesa, Arizona, USA, is a company developing and manufacturing MOS 65xx-based microprocessors, microcontrollers (µCs), and related support devices.
 WDC was founded in 1978 by co-holder of the MOS Technology 6502 patent, Bill Mensch, himself a former MOS Technology employee.
The Ricoh 2A03 or RP2A03 (NTSC version) / Ricoh 2A07 or RP2A07 (PAL version) is the 8-bit microprocessor in the Nintendo Entertainment System video game console manufactured by Ricoh.
 It contained a second source MOS Technology 6502 core, modified to disable the 6502's binary-coded decimal mode, with 22 memory-mapped I/O registers that controlled an APU, rudimentary DMA, and game controller polling.
 It was also used as a sound chip and secondary CPU by Nintendo's arcade games "Punch-Out!!
" and "Donkey Kong 3".
The Motorola 6809 (""sixty-eight-oh-nine"") is an 8-bit microprocessor CPU with some 16-bit features from Motorola.
 It was designed by Terry Ritter and Joel Boney and introduced in 1978.
 It was a major advance over both its predecessor, the Motorola 6800, and the related MOS Technology 6502.
 Among the systems to use the 6809 are the Dragon home computers, TRS-80 Color Computer, the Vectrex home console, and early 1980s arcade machines including "Defender", "", "Joust", and "Gyruss".
Seiko Epson Corporation (セイコーエプソン株式会社 , Seikō Epuson Kabushiki-gaisha ) (Epson being an abbreviation for "Son of Electronic Printer"), or simply Epson, is a Japanese electronics company and one of the world's largest manufacturers of computer printers, and information and imaging related equipment.
 Headquartered in Suwa, Nagano, Japan, the company has numerous subsidiaries worldwide and manufactures inkjet, dot matrix and laser printers, scanners, desktop computers, business, multimedia and home theatre projectors, large home theatre televisions, robots and industrial automation equipment, point of sale docket printers and cash registers, laptops, integrated circuits, LCD components and other associated electronic components.
 It is one of three core companies of the Seiko Group, a name traditionally known for manufacturing Seiko timepieces since its founding.
The MOS Technology 6502 (typically ""sixty-five-oh-two"" or ""six-five-oh-two"") is an 8-bit microprocessor that was designed by a small team led by Chuck Peddle for MOS Technology.
 When it was introduced in 1975, the 6502 was, by a considerable margin, the least expensive full-featured microprocessor on the market.
 It initially sold for less than one-sixth the cost of competing designs from larger companies, such as Motorola and Intel, and caused rapid decreases in pricing across the entire processor market.
 Along with the Zilog Z80, it sparked a series of projects that resulted in the home computer revolution of the early 1980s.
An illegal opcode, also called an undocumented instruction, is an instruction to a CPU that is not mentioned in any official documentation released by the CPU's designer or manufacturer, which nevertheless has an effect.
 Illegal opcodes were common on older CPUs designed during the 1970s, such as the MOS Technology 6502, Intel 8086, and the Zilog Z80.
 They exist as a side effect of the wiring of transistors in the CPU, and usually combine functions of the CPU that were not intended to be combined.
The Atari 8-bit family is a series of 8-bit home computers introduced by Atari, Inc. in 1979 and manufactured until 1992.
 All of the machines in the family are technically similar and differ primarily in packaging.
 They are based on the MOS Technology 6502 CPU running at 1.79 MHz, and were the first home computers designed with custom co-processor chips.
 This architecture enabled graphics and sound capabilities that were more advanced than contemporary machines like the Apple II or Commodore PET, and gaming on the platform was a major draw. "
Star Raiders" is considered the platform's killer app.
The 6522 Versatile Interface Adapter (VIA) is an integrated circuit that was designed and manufactured by MOS Technology as an I/O port controller for the 6502 family of microprocessors.
 It provides two bidirectional 8-bit parallel I/O ports, two 16-bit timers (one of which can also operate as an event counter), and an 8-bit shift register for serial communications or data conversion between serial and parallel forms.
 The direction of each bit of the two I/O ports can be individually programmed.
 In addition to being manufactured by MOS Technology, the 6522 was second sourced by other companies including Rockwell and Synertek.

Question: The MOS Technology 6502 8-bit CPU was manufactured by a corporation whose name is an abbreviation for what?
Answer: Son of Electronic Printer