NEC V60
Encyclopedia
The NEC V60 was a CISC
processor manufactured by NEC
introduced in the late 1980s. It had a 32-bit internal bus and a 16-bit external bus with a 24-bit address bus. A relatively obscure design, it was a radical departure from NEC's previous V-series CPUs (such as the NEC V20
), most of which were based on the Intel x86 model. According to NEC's documentation, the change was made due to the increasing demand and diversity of programs, calling for a processor with both power (the 32-bit internal bus) and flexibility (having large numbers of general-purpose registers—a common feature of RISC architectures and a benefit to the emerging high-level languages). Despite its obscurity, it was the first 32-bit general-purpose microprocessor to be mass-produced in Japan, and information about the processor has slowly been accumulated through a combination of reference materials and reverse engineering
.
Sega
chose this processor for most of its arcade games in the 1990s (the Sega System 32 and Sega Model 1 architectures both used this as their main CPU). The V60 was also used as the main CPU in the SSV arcade architecture—so named because it was developed together by Seta
, Sammy
, and Visco
. Sega originally considered using the V60 as the basis for its Sega Saturn
console (presumably using Model 1 as a template) but instead chose the dual-SH-2
design for the eventual production model.
The NEC V70 (μPD70632) improves on the V60 by making both the internal and external buses 32 bits wide. The V70 was used by Sega
in its System Multi 32 design and by Jaleco
in its Mega System 32 design.
Complex instruction set computer
A complex instruction set computer , is a computer where single instructions can execute several low-level operations and/or are capable of multi-step operations or addressing modes within single instructions...
processor manufactured by NEC
NEC
, a Japanese multinational IT company, has its headquarters in Minato, Tokyo, Japan. NEC, part of the Sumitomo Group, provides information technology and network solutions to business enterprises, communications services providers and government....
introduced in the late 1980s. It had a 32-bit internal bus and a 16-bit external bus with a 24-bit address bus. A relatively obscure design, it was a radical departure from NEC's previous V-series CPUs (such as the NEC V20
NEC V20
The NEC V20 was a processor made by NEC that was a reverse-engineered, pin-compatible version of the Intel 8088 with an instruction set compatible with the Intel 80186...
), most of which were based on the Intel x86 model. According to NEC's documentation, the change was made due to the increasing demand and diversity of programs, calling for a processor with both power (the 32-bit internal bus) and flexibility (having large numbers of general-purpose registers—a common feature of RISC architectures and a benefit to the emerging high-level languages). Despite its obscurity, it was the first 32-bit general-purpose microprocessor to be mass-produced in Japan, and information about the processor has slowly been accumulated through a combination of reference materials and reverse engineering
Reverse engineering
Reverse engineering is the process of discovering the technological principles of a device, object, or system through analysis of its structure, function, and operation...
.
Sega
Sega
, usually styled as SEGA, is a multinational video game software developer and an arcade software and hardware development company headquartered in Ōta, Tokyo, Japan, with various offices around the world...
chose this processor for most of its arcade games in the 1990s (the Sega System 32 and Sega Model 1 architectures both used this as their main CPU). The V60 was also used as the main CPU in the SSV arcade architecture—so named because it was developed together by Seta
Seta
Seta is a biological term derived from the Latin word for "bristle". It refers to a number of different bristle- or hair-like structures on living organisms.-Animal setae:In zoology, most "setae" occur in invertebrates....
, Sammy
Sammy
-People:*DJ Sammy, a musician*Sammy Davis, Jr.*Sammy Ijaz*Sammy Sosa*Sammy Hagar*Sammy Cahn*Sammy Gravano*Sammy Fain*CeCe Sammy*Sammy Baugh*Sammy Kaye* Sammy Luftspring, Canadian champion welterweight boxer*Sammy McIlroy*Sammy Kershaw*Sammy Lee...
, and Visco
Visco Corporation
is a Japanese software company located in Kita-ku, Kyoto, Japan. It was founded in by , and later became corporate on August 8, while revealing itself as "Visco" in Kanamecho, Toshima, Tokyo Japan. They originally developed video games for several platforms from the arcades and NES, to the...
. Sega originally considered using the V60 as the basis for its Sega Saturn
Sega Saturn
The is a 32-bit fifth-generation video game console that was first released by Sega on November 22, 1994 in Japan, May 11, 1995 in North America, and July 8, 1995 in Europe...
console (presumably using Model 1 as a template) but instead chose the dual-SH-2
SuperH
SuperH is a 32-bit reduced instruction set computer instruction set architecture developed by Hitachi. It is implemented by microcontrollers and microprocessors for embedded systems....
design for the eventual production model.
The NEC V70 (μPD70632) improves on the V60 by making both the internal and external buses 32 bits wide. The V70 was used by Sega
Sega
, usually styled as SEGA, is a multinational video game software developer and an arcade software and hardware development company headquartered in Ōta, Tokyo, Japan, with various offices around the world...
in its System Multi 32 design and by Jaleco
Jaleco
is a Japanese video game publisher and developer established in 2006.The original Jaleco Ltd was founded in 1974. In 2006, it decided to become a pure holding company by renaming itself Jaleco Holding and splitting its video game operations into a newly created subsdiary that took its former name...
in its Mega System 32 design.