The Intel 8080

General

General Information	The 8080 was created by the Intel with Federico Faggin as the lead designer (his last chip before he left and started Zilog). The 8080 was released in March of 1974. This chip is date coded to 1976, so it is a very early version of the chip. The 8080 was used in the Altair 8800, the first widely-known personal computer. Because of its increased function and power over the 4004 and 8008, the 8080 was the first widely accepted microprocessor. "The 8080 really created the microprocessor market. The 4004 and 8008 suggested it, but the 8080 made it real." - Federico Faggin. The 8080 had a 16 bit address bus and an 8 bit data bus. Internally it had seven 8 bit registers (A-E, H, L - pairs BC, DE and HL could be combined as 16 bit registers), a 16 bit stack pointer to memory which replaced the 8 level internal stack of the 8008, and a 16 bit program counter. It also had several I/O ports - 256 of them, so I/O devices could be hooked up without taking away or interfering with the addressing space, and a signal pin that allowed the stack to occupy a separate bank of memory The 8080 family is also referred to as the MCS-80.
Production	April, 1974
Designers	Federico Faggin, Masatoshi Shima, Stan Mazor

Type

Data Word

Address Space

Clock

Instruct- ions

Assists

Reg's GP

Reg's Math

Reg's Index

IO Ports

Stack

Interrupts

Memory

8-bit

64KB

Base 2Mhz, (-2) 2.6Mhz, (-1) 3Mhz

Ext*

6 8-bit

512

Stack Pointer

Vectored, Multi- level

* Intel made a hardware multiply chip called the 8231 for the 8080

Chip Name	Package	On-Chip Identification	Picture	General Comments
C8080	White/Gold CerDIP, 40-pin	C8080	NA	Intel Museum in Santa Clara, CA has one dated 7511
C8080-8	White/Gold CerDIP, 40-pin	C8080-8
C8080A	White/Gold CerDIP, 40-pin	C8080A
MC8080A/B	White/Gold CerDIP, 40-pin	MC8080A/B		Military version /B spec's
C8080A-1	White/Gold CerDIP, 40-pin	C8080A-1
C8080A-2	White/Gold CerDIP, 40-pin	C8080A-2	NA
D8080	Gray Ceramic, 40-pin DIP	D8080	NA
D8080A	Gray Ceramic, 40-pin DIP	D8080A
ID8080A	Gray Ceramic, 40-pin DIP	ID8080A	NA
D8080A-1	Gray Ceramic, 40-pin DIP	D8080A-1
D8080A-2	Gray Ceramic, 40-pin DIP	D8080A-2	NA
P8080A	Black Resin, 40-pin DIP	P8080A
P8080A-1	Black Resin, 40-pin DIP	P8080A-1
P8080A-2	Black Resin, 40-pin DIP	P8080A-2	NA

Chip Name	Package	On-Chip Identification	Picture	General Comments
MD8080A/B	Gray Ceramic, 40-pin DIP	MD8080A/B		Military version testing procedure B


Intel Advertisement for the 8080

Related Chips	Intel 8085
Second Sources	AMD (8080,AM9080), Mitsubishi (M58710S), NEC (uPD8080A), National Semiconductor (DP8080A), Texas Instruments (TMS8080A)
Support Chips	8205 (Binary Decoder), 8212 (8-bit I/O Port), 8214 (Priority Interrupt Controller), 8216 (4-bit Parallel Bi-directional bus driver), 8224 (Clock generator), 8228 (System controller and bus driver), 8238 (System controller and bus driver (enhanced timing control)), 8251 (Communications Interface), 8253 (Programmable Interval Timer), 8255 (Programmable Peripheral Interface), 8257 (DMA Controller), 8259 (Interrupt Controller), 8271 (Floppy Disk Controller), 8273 (SDLC Protocol Controller), 8275 (CRT Controller), 8279 (Keyboard/Display Interface), 8801 (Clock Crystal for use with the 8224)