The Intel 8008 (initially as 1201) was introduced on April 1, 1972 and was the first 8-bit processor and the first Von Neumann computer from Intel . It was housed in an 18-pin DIL housing and consisted of 3500 transistors . It is widely believed that the 8008 is an 8-bit extended 4004 or a further development of the 4040 . Both CPUs are fundamentally different from the 8008. The 8008 is considered the direct predecessor of the Intel 8080 , making it the basis of the x86 - processor architecture and the associated instruction sets from Intel.
The 8008 was not widely used u. a. through its use in terminals , analysis devices and desktop computers such as the Mark-8 or the Micral . However, he was not granted great success. Because of its very "compact" bus interface , the connection of required memory and I / O - modules considerable decoding effort. Its instruction set was very inflexible and its possibilities for interrupt processing were rudimentary, as there was no way to completely save its internal state (registers H, L and the flags could not be saved), as is essential for sensible interrupt handling . He also had another eight entries long CPU internal return - stack , the could not be directly accessed by the instruction set. The instruction set and microarchitecture of the successor 8080 have been fundamentally revised and much more flexible. Nonetheless, practically every 8008 instruction has its equivalent in the 8080 instruction set, so that the 8008 can ultimately also be regarded as an early forerunner of the 8086 , which u. a. was also developed with a view to making the 8080 and 8085 software easily portable .
Technical specifications
U 808 D (GDR replica of the 8008) • Start of development: 1974 • Planned start of production: 6/1977 • Start of production: 1978 • End of production: 1986/88
↑ a b "The 8008 was Intel's first Neumann computer and was sold under the name MCS-8 to the Japanese Seiko Corporation, which was looking for a processor for desktop computers . In the history of personal computers, it is considered the direct predecessor of the 8080, the took over all commands of the 8008. This makes the microprocessor the ancestor of the successful X86 architecture. " With the 8008 came the microphones from Detlef Borchers, April 1, 2012; Accessed April 2, 2012.
