Intel MCS-80
8080, the CPU of the MCS-80 system
Developer	Intel
Manufacturer	Intel
Type	microprocessors
Production	1974
Release date	April, 1974
Architecture	8-bit word, 16-bit addressing
ISA	8080
Word size	8 bit 1 octets 2 nibbles
Process	6 μm 6,000 nm 0.006 mm
Technology	nMOS
Clock	500 kHz-2.08 MHz
Package	DIP40
Succession
←	→
MCS-8	MCS-85 MCS-86 MCS-88

The MCS-80 (Micro Computer Set-80) was a family of 8-bit microprocessor chipsets developed by Intel. Introduced on April, 1974, the MCS-80 featured the 8080 CPU, the forefather of all modern x86-based microprocessors.

History

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Members

The original 8080 had an issue that prevented it from working with external TTL components as intended. This was fixed with the introduction of the "A" versions.

Part	Frequency	Description
8080	500 kHz - 2.08 MHz	MPU, Original, has compatibility issues with TTL
8080A-1	500 kHz - 3.12 MHz	MPU
8080A-2	500 kHz - 2.63 MHz	MPU
8224		clock generator & driver
8801		clock generator crystal
8228		system controller & bus driver
8238		system controller & bus driver
8257		Programmable DMA Controller
8259		Programmable Interrupt Controller
8279		Programmable Keyboard/Display Controller
8271		Programmable Floppy Disk Controller
8222		Dynamic RAM Refresh Controller
8205		1 Of 8 Binary Decoder
8210		TTL To MOS Shifter & High Voltage Clock Driver
8212		8 Bit I/O Port
8214		Priority Interrupt Control Unit
8216		4 Bit Parallel Bidirectional Bus Driver
8251A		Improved Programmable Communication Interface
8253		Programmable Interval Timer
8255		Programmable Peripheral Interface
8255A		Improved Programmable Peripheral Interface

Military Specs

The following are military specs versions.

Part	Frequency	Description
M8080A	500 kHz - 2.08 MHz	MPU
M8224		clock generator & driver
M8228		system controller & bus driver
M8238		system controller & bus driver

Memory

Additional memory components that was used with the MCS-80

Part	Size	Description
8708	1024x8 bit	EPROM
2716	2048x8 bit	EPROM (pin compatible with 2316E ROM)
8308	1024x8 bit	MOS ROM (pin compatible with 8708 PROM)
8316A	2048x8 bit	MOS RAM
2316E	2048x8 bit	ROM
2114	1024x4 bit	SRAM
2116	16384x1 bit	DRAM

Design

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ISA

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Designers

Lead designers for the MCS-80 are:

• Federico Faggin
• Masatoshi Shima
• Stan Mazor

Documents

• MCS-80 Users Manual, Oct 1977

See Also

• MCS-4
• MCS-8

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