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The
MOS Technology MOS Technology, Inc. ("MOS" being short for Metal Oxide Semiconductor), later known as CSG (Commodore Semiconductor Group) and GMT Microelectronics, was a semiconductor design and fabrication company based in Audubon, Pennsylvania. It is ...
"Agnus", usually called Agnus, is an
integrated circuit An integrated circuit (IC), also known as a microchip or simply chip, is a set of electronic circuits, consisting of various electronic components (such as transistors, resistors, and capacitors) and their interconnections. These components a ...
in the custom
chipset In a computer system, a chipset is a set of electronic components on one or more integrated circuits that manages the data flow between the processor, memory and peripherals. The chipset is usually found on the motherboard of computers. Chips ...
of the
Amiga Amiga is a family of personal computers produced by Commodore International, Commodore from 1985 until the company's bankruptcy in 1994, with production by others afterward. The original model is one of a number of mid-1980s computers with 16-b ...
computer. The Agnus, Denise and Paula chips collectively formed the
OCS OCS or Ocs may refer to: Places * Öcs, a village in Veszprém county, Hungary * Outer Continental Shelf, a maritime federal land zone beyond the jurisdiction of the United States Music * Ocean Colour Scene, an English rock group * Thee Oh Se ...
and ECS chipsets. The Agnus is the Address Generator Chip. Its main function, in chip area, is the
RAM Ram, ram, or RAM most commonly refers to: * A male sheep * Random-access memory, computer memory * Ram Trucks, US, since 2009 ** List of vehicles named Dodge Ram, trucks and vans ** Ram Pickup, produced by Ram Trucks Ram, ram, or RAM may also ref ...
Address Generator and Register Address Encoder which handles all DMA addresses. The 8361 Agnus is made up of approximately 21000
transistor A transistor is a semiconductor device used to Electronic amplifier, amplify or electronic switch, switch electrical signals and electric power, power. It is one of the basic building blocks of modern electronics. It is composed of semicondu ...
s and contains DMA Channel Controllers. The
Blitter A blitter is a circuit, sometimes as a coprocessor or a logic block on a microprocessor, dedicated to the rapid movement and modification of data within a computer's memory. A blitter can copy large quantities of data from one memory area to a ...
and
Copper Copper is a chemical element; it has symbol Cu (from Latin ) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkish-orang ...
are also contained here. Originally Agnus was fabricated in 5 μm manufacturing process like all
OCS OCS or Ocs may refer to: Places * Öcs, a village in Veszprém county, Hungary * Outer Continental Shelf, a maritime federal land zone beyond the jurisdiction of the United States Music * Ocean Colour Scene, an English rock group * Thee Oh Se ...
chipset. Agnus features: * Memory controller ("Chip" memory that can be accessed by the processor and the chipset) * The
Blitter A blitter is a circuit, sometimes as a coprocessor or a logic block on a microprocessor, dedicated to the rapid movement and modification of data within a computer's memory. A blitter can copy large quantities of data from one memory area to a ...
, a
bitmap In computing, a bitmap (also called raster) graphic is an image formed from rows of different colored pixels. A GIF is an example of a graphics image file that uses a bitmap. As a noun, the term "bitmap" is very often used to refer to a partic ...
manipulator. The Blitter is capable of copying blocks of display data, or any arbitrary data in the chip memory, at high speed with various raster operations as well as drawing pixel perfect lines and filling outlined polygons, while freeing the CPU for concurrent tasks. * "
Copper Copper is a chemical element; it has symbol Cu (from Latin ) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkish-orang ...
", a display synchronized co-processor * 25
Direct Memory Access Direct memory access (DMA) is a feature of computer systems that allows certain hardware subsystems to access main system computer memory, memory independently of the central processing unit (CPU). Without DMA, when the CPU is using programmed i ...
(DMA) channels, allowing graphics, sound and I/O to be used with minimal CPU intervention *
DRAM Dram, DRAM, or drams may refer to: Technology and engineering * Dram (unit), a unit of mass and volume, and an informal name for a small amount of liquor, especially whisky or whiskey * Dynamic random-access memory, a type of electronic semicondu ...
refresh controller * Generates the system clock from the 28 MHz oscillator * Video timing Agnus was replaced by
Alice Alice may refer to: * Alice (name), most often a feminine given name, but also used as a surname Literature * Alice (''Alice's Adventures in Wonderland''), a character in books by Lewis Carroll * ''Alice'' series, children's and teen books by ...
in the
Amiga 4000 The Amiga 4000, or A4000, from Commodore is the successor of the Amiga 2000 and Amiga 3000 computers. There are two models: the A4000/040 released in October 1992 with a Motorola 68040 CPU, and the A4000/030 released in April 1993 with a M ...
and
Amiga 1200 The Amiga 1200, or A1200 (code-named " Channel Z"), is a personal computer in the Amiga computer family released by Commodore International, aimed at the home computer market. It was launched on October 21, 1992, at a base price of £399 in the ...
when the
AGA Aga or AGA may refer to: Business * Architectural Glass and Aluminum (AGA), a glazing contractor, established in 1970 * AGA (automobile), , 1920s German car company * AGA AB, , a Swedish company, the originator of the AGA cooker * AGA Rangemaster ...
chipset was introduced in 1992.


Chips by capability

*
OCS OCS or Ocs may refer to: Places * Öcs, a village in Veszprém county, Hungary * Outer Continental Shelf, a maritime federal land zone beyond the jurisdiction of the United States Music * Ocean Colour Scene, an English rock group * Thee Oh Se ...
Agnus which can address up to 512 KB of
Chip RAM Chip RAM is a commonly used term for the integrated RAM used in Commodore's line of Amiga computers. Chip RAM is shared between the central processing unit (CPU) and the Amiga's dedicated chipset (hence the name). It was also, rather misleadingly, k ...
(PLCC versions add 512 KB of pseudo-fast RAM) ** 8361 ( DIP) -
Amiga 1000 The Amiga 1000, also known as the A1000, is the first personal computer released by Commodore International in the Amiga line. It combines the 16/32-bit Motorola 68000 CPU which was powerful by 1985 standards with one of the most advanced grap ...
(NTSC);
Amiga 2000 The Amiga 2000 (A2000) is a personal computer released by Commodore in March 1987. It was introduced as a "big box" expandable variant of the Amiga 1000 but quickly redesigned to share most of its electronic components with the contemporary Am ...
model A (NTSC) ** 8367 (DIP) -
Amiga 1000 The Amiga 1000, also known as the A1000, is the first personal computer released by Commodore International in the Amiga line. It combines the 16/32-bit Motorola 68000 CPU which was powerful by 1985 standards with one of the most advanced grap ...
(PAL);
Amiga 2000 The Amiga 2000 (A2000) is a personal computer released by Commodore in March 1987. It was introduced as a "big box" expandable variant of the Amiga 1000 but quickly redesigned to share most of its electronic components with the contemporary Am ...
model A (PAL) ** 8370 ( PLCC) -
Amiga 500 The Amiga 500, also known as the A500, was the first popular version of the Amiga home computer, "redefining the home computer market and making so-called luxury features such as multitasking and colour a standard long before Microsoft or Apple ...
to Rev 5.x (NTSC);
Amiga 2000 The Amiga 2000 (A2000) is a personal computer released by Commodore in March 1987. It was introduced as a "big box" expandable variant of the Amiga 1000 but quickly redesigned to share most of its electronic components with the contemporary Am ...
model B to Rev 4.5 (NTSC) ** 8371 ( PLCC) -
Amiga 500 The Amiga 500, also known as the A500, was the first popular version of the Amiga home computer, "redefining the home computer market and making so-called luxury features such as multitasking and colour a standard long before Microsoft or Apple ...
to Rev 5.x (PAL);
Amiga 2000 The Amiga 2000 (A2000) is a personal computer released by Commodore in March 1987. It was introduced as a "big box" expandable variant of the Amiga 1000 but quickly redesigned to share most of its electronic components with the contemporary Am ...
model B to Rev 4.5 (PAL) * ECS Agnus which can address up to 1 MB of
Chip RAM Chip RAM is a commonly used term for the integrated RAM used in Commodore's line of Amiga computers. Chip RAM is shared between the central processing unit (CPU) and the Amiga's dedicated chipset (hence the name). It was also, rather misleadingly, k ...
** 8372 - no data* ** 8372A -
Amiga 500 The Amiga 500, also known as the A500, was the first popular version of the Amiga home computer, "redefining the home computer market and making so-called luxury features such as multitasking and colour a standard long before Microsoft or Apple ...
from Rev 6 (NTSC/PAL);
Amiga 2000 The Amiga 2000 (A2000) is a personal computer released by Commodore in March 1987. It was introduced as a "big box" expandable variant of the Amiga 1000 but quickly redesigned to share most of its electronic components with the contemporary Am ...
model B from Rev 6.0 to Rev 6.3 (NTSC/PAL);
Commodore CDTV The CDTV (from Commodore Dynamic Total Vision, later treated as a backronym for Compact Disc Television) is a home multimedia entertainment and video game console – convertible into a full-fledged personal computer by the addition of optional ...
** 8375 (318069-16 only) (PAL) -
Amiga 500 The Amiga 500, also known as the A500, was the first popular version of the Amiga home computer, "redefining the home computer market and making so-called luxury features such as multitasking and colour a standard long before Microsoft or Apple ...
from Rev 6 (PAL);
Amiga 2000 The Amiga 2000 (A2000) is a personal computer released by Commodore in March 1987. It was introduced as a "big box" expandable variant of the Amiga 1000 but quickly redesigned to share most of its electronic components with the contemporary Am ...
model B from Rev 6.4 (PAL) ** 8375 (318069-17 only) (NTSC) -
Amiga 500 The Amiga 500, also known as the A500, was the first popular version of the Amiga home computer, "redefining the home computer market and making so-called luxury features such as multitasking and colour a standard long before Microsoft or Apple ...
from Rev 6 (NTSC);
Amiga 2000 The Amiga 2000 (A2000) is a personal computer released by Commodore in March 1987. It was introduced as a "big box" expandable variant of the Amiga 1000 but quickly redesigned to share most of its electronic components with the contemporary Am ...
model B from Rev 6.4 (NTSC) * ECS Agnus which can address up to 2 MB of
Chip RAM Chip RAM is a commonly used term for the integrated RAM used in Commodore's line of Amiga computers. Chip RAM is shared between the central processing unit (CPU) and the Amiga's dedicated chipset (hence the name). It was also, rather misleadingly, k ...
** 8372AB -
Amiga 3000 The Amiga 3000, or A3000, is a personal computer released by Commodore in June 1990. It is the successor to the Amiga 2000 and its upgraded model Amiga 2500 with more processing speed, improved graphics, and a new revision of the operating sys ...
from Rev 6.1 to Rev 8.9 (NTSC/PAL) ** 8372B -
Amiga 3000 The Amiga 3000, or A3000, is a personal computer released by Commodore in June 1990. It is the successor to the Amiga 2000 and its upgraded model Amiga 2500 with more processing speed, improved graphics, and a new revision of the operating sys ...
Rev 9 (NTSC/PAL) ** 8375 (PAL) -
Amiga 500 Plus The Amiga 500, also known as the A500, was the first popular version of the Amiga home computer, "redefining the home computer market and making so-called luxury features such as multitasking and colour a standard long before Microsoft or Apple ...
;
Amiga 600 The Amiga 600, also known as the A600, and full title Commodore Amiga 600, is a home computer introduced in March 1992. It is the final Amiga model based on the Motorola 68000 and the 1990 Amiga Enhanced Chip Set. A redesign of the Amiga 500 Plus ...
(PAL) ** 8375 (NTSC) -
Amiga 600 The Amiga 600, also known as the A600, and full title Commodore Amiga 600, is a home computer introduced in March 1992. It is the final Amiga model based on the Motorola 68000 and the 1990 Amiga Enhanced Chip Set. A redesign of the Amiga 500 Plus ...
(NTSC) * Somewhere 8372A Agnus mentioned as simply "8372".


Chips by package

* 48-lead DIP Agnus (aka thin Agnus): 8361; 8367 * 84-contact PLCC Fat Agnus (named Fat Lady on most Amiga 2000 motherboards) 8370; 8371; 8372; 8372A; 8372AB; 8372B; 8375 Notes
Fat Agnus 1MB and Fat Agnus 2MB also known as Super Agnus; Super Fat Agnus; Fatter Agnus; Big Agnus; Big Fat Agnus.


DMA Channels


Pinout


PLCC versions

When replacing or upgrading chips, pinouts need to be taken care of. Types are just mentioned for reference; four-digit types and pinouts/usage are ''not'' consistent. References: A500 Service Training, A3000 Service Manual, A500+ Service Manual, A1200 schematics


See also


References

;Sources * AMIGA 1000 ASSEMBLY LEVEL REPAIR (Commodore-Amiga, Inc.) 1985 PN 314038-0
Dave's Amiga Schematics and Manuals
* Commodore Amiga A500/A2000 Technical Reference Manual (Commodore-Amiga, Inc.) 198

* A500 SYSTEM SCHEMATICS COMPONENT PART LIST (Rev 6A/7

* A3000 SYSTEM SCHEMATICS (Commodore Business Machines, Inc.) March, 1990 PN-314677-0
www.1000bit.net
* CDTV SERVICE MANUAL (Commodore International Spare GmbH) May, 1991 PN-400403-0
www.ianstedman.co.uk (ZIP-file)
* A500 PLUS SERVICE MANUAL (Commodore International Spare GmbH) October, 1991 PN-400420-0
www.1000bit.net
* A600 SYSTEM SCHEMATICS (Commodore International Spare GmbH) April, 1992 PN-400422-0
www.1000bit.net

OBLIGEMENT: les chipsets de l'Amiga

Big Book of Amiga Hardware
* alexh o

(Agnus 8372B info) * National Amiga Inc.''
mirrored on l8r.net

Marketed Commodore Amiga models






;Notes {{DEFAULTSORT:Mos Technology Agnus MOS Technology integrated circuits Amiga