An Intel C8080 A processor. Not to be confused with 8080 Intel. AMD clone AM9080. NEC 8080 AF (second source). The Intel 8080 ( eighty-eighty ) was the second 8-bit microprocessor designed and manufactured by Intel and was released in April 1974.[1] It was an extended and enhanced variant of the earlier 8008 design, although without binary compatibility. The initial specified clock frequency limit was 2 MHz, and with common instructions using 4, 5, 7, 10, or 11 cycles this meant that it operated at a typical speed of a few hundred thousand instructions per second. The 8080 required two support chips to function in most applications, the i8224 clock generator/driver and the i8228 bus controller, and it was implemented in NMOS using non-saturated enhancement mode transistors as loads,[2] therefore demanding a +12 V and a −5 V voltage in addition to the main TTL compatible +5 V. Although earlier microprocessors were used for calculators, cash registers, computer terminals, industrial robots,[3] and other applications, the 8080 became one of the first really widespread microprocessors. This was partly due to its simplifying NMOS implementation (making it TTL compatible but also to its enhanced instruction set (over the 8008[4]) and its subsequent role as the original target CPU for CP/ M,[5] the first de facto standard personal computer operating system.[6] The 8080 was successful enough that compatibility at the assembly language level became a design requirement for the 8086 when design for it was started in 1976. This also means that the 8080 indirectly influenced the ubiquitous 32-bit and 64-bit x86 architectures of today. Contents 1 Description 1.1 Programming model Registers Flags Commands/instructions 8-bit instructions 16-bit operations 1.2 Input/output scheme Input output port space Separate stack space 1.3 The.
' This manual describes the assembly language format, and how to write assembly language programs for the Intel 8080 microprocessor. Detailed information on the operation of specific assemblers is available in the Program operation guide for each specific assembler.' 91 pages. This document has recently been digitised and made available here. Digitising our collections requires significant resources. Please consider making a donation to the Centre if you download this manual! Reference Number / ISBN : Date Published : 1974 Publisher : Intel Format : PDF This exhibit has a reference ID of CH32739. Please quot; this reference ID in any communication with the Centre for Computing History. Click on the Images For Detail This manual can be downloaded from the Computing History Shop. File Size: 8.3 Mb Price: £0.
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