The Original Chip Set (OCS) is a chipset used in the earliest CommodoreAmiga computers and defined the Amiga's graphics and sound capabilities. It was succeeded by the slightly improved Enhanced Chip Set (ECS) and the greatly improved Advanced Graphics Architecture (AGA).
The chipset which gave the Amiga its unique graphics features consists of three main "custom" chips; Agnus, Denise, and Paula. Both the original chipset and the enhanced chipset were manufactured using NMOS logic technology by Commodore's chip manufacturing subsidiary, MOS Technology. According to Jay Miner, the OCS chipset was fabricated in 5μm manufacturing process while AGA Lisa was implemented in 1.5μm process. All three custom chips were originally packaged in 48-pin DIPs; later versions of Agnus, known as Fat Agnus, were packaged in an 84-pin PLCC.
Agnus is the central chip in the design. It controls all access to chip RAM from both the central 68000 processor and the other custom chips, using a complicated priority system. Agnus includes sub-components known as the blitter (fast transfer of data in memory without the intervention of the processor) and the Copper (video-synchronized co-processor). The original Agnus can address 512 KB of chip RAM. Later revisions, dubbed 'Fat Agnus', added 512 KB pseudo-fast RAM, which for ECS was changed to 1MB (sometimes called 'Fatter Agnus') and subsequently to 2MB chip RAM.
Denise is the main video processor. Without using overscan, the Amiga's graphics display is 320 or 640 pixels wide by 200 (NTSC) or 256 (PAL) pixels tall. Denise also supports interlacing, which doubles the vertical resolution, at the cost of intrusive flickering on typical monitors of that era. Planarbitmap graphics are used, which splits the individual bits per pixel into separate areas of memory, called bitplanes. In normal operation, Denise allows between one and five bitplanes, giving two to 32 unique colors. These colors are selected from a palette of 4096 colors (four bits per RGB component). A 6th bitplane is available for two special video modes: Halfbrite mode and Hold-And-Modify (HAM) mode. Denise also supports eight sprites, single pixel scrolling, and a "dual-playfield" mode. Denise also handles mouse and digital joystick input.
Paula is primarily the audio chip, with four independent hardware-mixed 8-bitPCM sound channels, each of which supports 65 volume levels (no sound to maximum volume) and waveform output rates from roughly 20 samples per second to almost 29,000 samples per second. Paula also handles interrupts and various I/O functions including the floppy disk drive, the serial port, and analog joysticks.
There are many similarities– both in overall functionality and in the division of functionality into the three component chips– between the OCS chipset and the much earlier and simpler chipset of the Atari 8-bit computers, consisting of the ANTIC, GTIA and POKEY chips; both chipsets were conceptually designed by Jay Miner, which explains the similarity.
The Agnus chip is in overall control of the entire chipset's operation. All operations are synchronised to the position of the video beam. This includes access to the built-in RAM, known as chip RAM because the chipset has access to it. Both the central 68000 processor and other members of the chipset have to arbitrate for access to chip RAM via Agnus. In computing architecture terms, this is Direct Memory Access (DMA), where Agnus is the DMA Controller (DMAC).
Agnus has a complex and priority-based memory access policy that attempts to best coordinate requests for memory access among competing resources. For example, bitplane data fetches are prioritized over blitter transfers as the immediate display of frame buffer data is considered more important than the processing of memory by the blitter. Agnus also attempts to order accesses in such a way so as to overlap CPU bus cycles with DMA cycles. As the original 68000 processor in Amigas tended only to access memory on every second available memory cycle, Agnus operates a system where "odd" memory access cycles are allocated first and as needed to time-critical custom chip DMA while any remaining cycles are available to the CPU, thus the CPU does not generally get locked out of memory access and does not appear to slow down. However, non-time-critical custom chip access, such as blitter transfers, can use up any spare odd or even cycles and, if the "BLITHOG" (blitter hog) flag is set, Agnus can lock out the even cycles from the CPU in deference to the blitter.
Agnus's timings are measured in "color clocks" of 280ns. This is equivalent to two low resolution (140ns) pixels or four high resolution (70ns) pixels. Like Denise, these timings were designed for display on household TVs, and can be synchronized to an external clock source.
Blitter
The blitter is a sub-component of Agnus. "Blit" is shorthand for "block image transfer" or bit blit. The blitter is a highly parallel memory transfer and logic operation unit. It has three modes of operation: copying blocks of memory, filling blocks (e.g. polygon filling) and line drawing.
The blitter allows rapid copying of video memory, meaning that the CPU can be freed for other tasks. The blitter was primarily used for drawing and redrawing graphics images on the screen, called "bobs", short for "blitter objects".
The blitter's block copying mode takes zero to three data sources in memory, called A, B and C, performs a programmable Boolean function on the data sources and writes the result to a destination area, D. Any of these four areas can overlap. The blitter runs either from the start of the block to the end, known as "ascending" mode, or in reverse, "descending" mode.
Blocks are "rectangular"; they have a "width" in multiples of 16 bits, a height measured in "lines", and a "stride" distance to move from the end of one line to the next. This allows the blitter to operate on any video resolution up to 1,024×1,024 pixels.[1] The copy automatically performs a per-pixel logical operation. These operations are described generically using minterms. This is most commonly used to do direct copies (D = A), or apply a pixel mask around blitted objects (D = (C AND B) OR A). The copy can also barrel shift each line by 0 to 15 pixels. This allows the blitter to draw at pixel offsets that are not exactly multiples of 16.
These functions allow the Amiga to move GUI windows around the screen rapidly as each is represented in graphical memory space as a rectangular block of memory which may be shifted to any required screen memory location at will.
The blitter's line mode draws single-pixel thick lines using Bresenham's line algorithm. It can also apply a 16-bit repeating pattern to the line. The line mode can also be used to draw rotated bobs: each line of bob data is used as line pattern while the line mode draws the tilted bob line by line.
The blitter's filling mode is used to fill per-line horizontal spans. On each span, it reads each pixel in turn from right to left. Whenever it reads a set pixel, it toggles filling mode on or off. When filling mode is on, it sets every pixel until filling mode is turned off or the line ends. Together, these modes allow the blitter to draw individual flat-shaded polygons. Later Amigas tended to use a combination of a faster CPU and blitter for many operations.
Copper
The Copper is another sub-component of Agnus; The name is short for "co-processor". The Copper is a programmable finite-state machine that executes a programmed instruction stream, synchronized with the video hardware.
When it is turned on, the Copper has three states; either reading an instruction, executing it, or waiting for a specific video beam position. The Copper runs a program called the Copper list in parallel with the main CPU. The Copper runs in sync with the video beam, and it can be used to perform various operations which require video synchronization. Most commonly it is used to control video output, but it can write to most of the chipset registers and thus can be used to initiate blits, set audio registers, or interrupt the CPU.
The Copper list has three kinds of instructions, each one being a pair of two bytes, four bytes in total:
The MOVE instruction writes a 16-bit value into one of the chipset's hardware registers and is also used to strobe a new address into the Copper's instruction pointer.
The WAIT instruction halts Copper execution until a given beam position is reached, thus making possible to synchronize other instructions with respect to screen drawing. It can also wait for a blitter operation to finish. During a wait state the copper is off the bus and doesn't use DMA cycles.
The SKIP instruction will skip the following Copper instruction if a given beam position has already been reached. This can be used to create Copper list loops.
The length of the Copper list program is limited by execution time. The Copper restarts executing the Copper list at the start of each new video frame. There is no explicit "end" instruction; instead, the WAIT instruction is used to wait for a location which is never reached.
Uses of the Copper
The Copper is most commonly used to set and reset the video hardware registers at the beginning of each frame.
It can be used to change video settings mid-frame. This allows the Amiga to change video configuration, including resolution, between scanlines. This allows the Amiga to display different horizontal resolutions, different color depths, and entirely different frame buffers on the same screen. The AmigaOS graphical user interface allows two or more programs to operate at different resolutions in different buffers, while all are visible on the screen simultaneously. A paint program might use this feature to allow users to draw directly on a low resolution Hold-And-Modify (HAM) screen, while offering a high resolution toolbar at the top or bottom of the screen.
The Copper can also change color registers mid-frame, creating the "raster bars" effect seen commonly in Amiga games. The Copper can go further than this and change the background color often enough to make a blocky graphics display without using any bitmap graphics at all.
The Copper allows "re-use" of sprites; after a sprite has been drawn at its programmed location, the Copper can then immediately move it to a new location and it will be drawn again, even on the same scanline.
The Copper can trigger an interrupt when the video beam reaches a precise location on the display. This is useful for synchronizing the CPU to the video beam.
The Copper can also be used to program and operate the blitter. This allows blitter operation and control to proceed independently of, and concurrently with, the CPU. With copper and blitter programming each other a text mode can be emulated.
The Copper can be used to produce "sliced HAM", or S-HAM,[2] this consists of building a Copper list that switches the palette on every scanline, improving the choice of base colors in Hold-And-Modify mode graphics.
External video timing
Under normal circumstances, the Amiga generates its own video timings, but Agnus also supports synchronising the system to an external signal so as to achieve genlocking with external video hardware. There is also a 1-bit output on this connector that indicates whether the Amiga is outputting background color or not, permitting easy overlaying of Amiga video onto external video. This made the Amiga particularly attractive as a character generator for titling videos and broadcast work, as it avoided the use and expense of A/B roll and chroma key units that would be required without the genlock support. The support of overscan, interlacing and genlocking capabilities, and the fact that the display timing was very close to broadcast standards (NTSC or PAL), made the Amiga the first ideal computer for video purposes, and indeed, it was used in many studios for digitizing video data (sometimes called frame-grabbing), subtitling and interactive video news.
Denise
MOS 8362R5 - Denise
Denise is programmed to fetch planar video data from one to five bitplanes and translate that into a color lookup. The number of bitplanes is arbitrary, thus if 32 colors are not needed, 2, 4, 8 or 16 can be used instead. The number of bitplanes (and resolution) can be changed on the fly, usually by the Copper. This allows for very economical use of RAM, and balancing of CPU processing speed vs graphical sophistication when executing from Chip RAM (as modes beyond 4bpp in lores, or 2bpp in hires, use extra DMA channels that can slow or temporarily halt the CPU in addition to the usual non-conflicting channels). There can also be a sixth bitplane, which can be used in three special graphics modes:
In Extra-HalfBrite (EHB), if a pixel is set on the sixth bitplane, the brightness of the regular 32 color pixel is halved. Early versions of the Amiga 1000 sold in the United States did not have the Extra-HalfBrite mode.[3]
In Hold-And-Modify (HAM) mode, each 6-bit pixel is interpreted as two control bits and four data bits. The four possible permutations of control bits are "set", "modify red", "modify green" and "modify blue". With "set", the four data bits act like a regular 16-color display look up. With one of the "modify"s, the red, green or blue component of the previous pixel is modified to the data value, and the other two components are held from the previous pixel. This allows all 4096 colors on screen at once and is an example of lossy image compression in hardware.
In dual-playfield mode, instead of acting as a single screen, two "playfields" of eight colors each (three bitplanes each) are drawn on top of each other. They are independently scrollable and the background color of the top playfield "shines through" to the underlying playfield.
There are two horizontal graphics resolutions, "lowres" with 140ns pixels and "hires" with 70ns pixels, with a default of 320 or 640 horizontal pixels wide without using overscan. As the pixel output is regulated by the main system clock, which is based directly on the NTSC colorburst clock, these sizes very nearly fill the width of a standard television with only a thin "underscan" border between the graphics and the screen border when compared to many other contemporary home computers, for an appearance closer to a games console but with finer detail. On top of this, Denise supports reasonably extensive overscan; technically modes with enough data for up to 400 or 800 pixels (+25%) may be specified, although this is only actually useful for scrolling and special effects that involve partial display of large graphics, as a separate hardware limit is met at 368 (or 736) pixels, which is the maximum that will fit between the end of one blanking period and the start of the next - although it is unlikely that even this many pixels will be visible on any display other than a dedicated monitor that allows adjustment of horizontal scan width, as much of the image will, by design, disappear seamlessly behind the screen bezel (or, on LCDs, be cropped off at the edge of the panel).[4][5] Because of the highly regular structure of the Amiga's timing in relation to scanlines and allocation of DMA resources to various uses besides normal "playfield" graphics, increased horizontal resolution is also a tradeoff between number of pixels and how many hardware sprites are available, as increasing the DMA slots dedicated to playfield video ends up stealing some (from 1 to 7 of the total 8) the sprite engine..
Vertical resolution, without overscan, is 200 pixels for a 60Hz NTSC Amiga or 256 for a 50Hz PAL Amiga. This can be doubled using an interlaced display, and, as with horizontal resolution, increased using overscan, to a maximum of 241 (or 483) for NTSC, and 283 (or 567) for PAL (interlaced modes gaining one extra line as the maximum is determined by how many lines are taken from the available total by blanking and sync, and the total scanlines in non-interlaced modes are half the original, broadcast-spec odd-numbered interlaced counts, rounded down).
Starting with ECS, Denise was upgraded to support "Productivity" mode which allowed for 640x400 non-interlaced albeit with only 4 colors.
Denise can composite up to eight 16-pixel-wide sprites per scan line (in automatic mode) on top, underneath, or between playfields, and detect collisions between sprites and the playfields or between sprites. These sprites have three visible colors and one transparent color. Optionally, adjacent pairs of sprites can be "attached" to make a single 15-color sprite. The Sprite DMA reads data to form a sprite channel as controlled by its registers, enabling the vertical reuse of sprites. There has to be one empty scanline in between two successive list entries to allow for updating sprite data. Using Copper or CPU register manipulations, each sprite channel can be reused multiple times in a single frame to increase the total sprites per frame. Sprite position registers may also be changed during a scanline, increasing the total number of sprites on a single scanline. However, the sprite data, or shape, is only fetched a single time per scanline and can't change. The first Amiga game to utilize the sprite re-position registers during a scanline was Hybris released in 1988.
The Denise chip does not support a dedicated text mode.[6]
Finally, Denise next to the CIAs is responsible for handling mouse/joystick X/Y inputs.
The notion that Denise fetches bit plane and sprite data is a simplification. It is Agnus who is maintaining horizontal and vertical screen position counters and initiating the DRAM read operations. Denise has a number of bit plane registers which hold 16 bits of data each, enough to draw 16 pixels. When Agnus issues a write to register 1, all registers are then transferred into separate shift registers from which pixels are generated (at the same time new values are loaded from DRAM). Denise is not aware of any memory addresses either.
Paula
Paula chip (MOS Technology 8364 R4) used in Amiga1000Paula chip (MOS Technology 8364 R4) die
The Paula chip, designed by Glenn Keller, from MOS Technology, is the interrupt controller, but also includes logic for audio playback, floppy disk drive control, serial port input/output and mouse/joystick buttons two and three signals. The logic remained functionally identical across all Amiga models from Commodore.
Audio
Paula has four DMA-driven 8-bit PCM sound channels. Two sound channels are mixed into the left audio output, and the other two are mixed into the right output, producing stereo audio output. The only supported hardware sample format is signed linear 8-bit two's complement. Each sound channel has an independent frequency and a 6-bit volume control (64 levels). Internally, the audio hardware is implemented by four state machines, each having eight different states.
Additionally the hardware allows one channel in a channel pair to modulate the other channel's period or amplitude. It is rarely used on the Amiga due to both frequency and volume being controllable in better ways, but could be used to achieve different kinds of tremolo and vibrato, and even rudimentary FM synthesis effects.
Audio may be output using two methods. Most often, DMA-driven audio is used. As explained in the discussion of Agnus, memory access is prioritized and one DMA slot per scan line is available for each of the four sound channels. On a regular NTSC or PAL display, DMA audio playback is limited to a maximum output rate of 28,867 values per channel (PAL: 28837) per second totaling 57674 (PAL: 57734) values per second on each stereo output. This rate can be increased with the ECS and AGA chipsets by using a video mode with higher horizontal scan rate.
Alternately, Paula may signal the CPU to load a new sample into any of the four audio output buffers by generating an interrupt when a new sample is needed. This allows for output rates that exceed 57kHz per channel and increases the number of possible voices (simultaneous sounds) through software mixing.
The Amiga contains an analog low-pass filter (reconstruction filter) which is external to Paula. The filter is a 12dB/oct Butterworth low-pass filter at approximately 3.3kHz. The filter can only be applied globally to all four channels. In models after the Amiga1000 (excluding the very first revision of the Amiga500), the brightness of the power LED is used to indicate the status of the filter. The filter is active when the LED is at normal brightness, and deactivated when dimmed (on early Amiga500 models the LED went completely off). Models released before Amiga 1200 also have a static "tone knob" type low-pass filter that is enabled regardless of the optional "LED filter". This filter is a 6dB/oct low-pass filter with cutoff frequency at 4.5 or 5kHz.
A software technique was later developed which can play back 14-bit audio by combining two channels set at different volumes. This results in two 14-bit channels instead of four 8-bit channels. This is achieved by playing the high byte of a 16-bit sample at maximum volume, and the low byte at minimum volume (both ranges overlap, so the low byte needs to be shifted right two bits). The bit shift operation requires a small amount of CPU or blitter overhead, whereas conventional 8-bit playback is almost entirely DMA driven. This technique was incorporated into the retargetable audio subsystem AHI, allowing compatible applications to use this mode transparently.
Floppy disk controller
The floppy controller is unusually flexible. It can read and write raw bit sequences directly from and to the disk via DMA or programmed I/O at 500 (double density) or 250kbit/s (single density or GCR). MFM or GCR were the two most commonly used formats though in theory any run-length limited code could be used. It also provides a number of convenient features, such as sync-on-word (in MFM coding, $4489 is usually used as the sync word). MFM encoding/decoding is usually done with the blitter — one pass for decode, three passes for encode. Normally the entire track is read or written in one shot, rather than sector-by-sector; this made it possible to get rid of most of the inter-sector gaps that most floppy disk formats need to safely prevent the "bleeding" of a written sector into the previously-existing header of the next sector due to speed variations of the drive. If all sectors and their headers are always written in one go, such bleeding is only an issue at the end of the track (which still must not bleed back into its beginning), so that only one gap per track is needed. This way, for the native Amiga disk format, the raw storage capacity of 3.5inch DD disks was increased from the typical 720KB to 880KB, although the less-than-ideal file system of the earlier Amiga models reduced this again to approximately 830KB of actual payload data.
In addition to the native 880KB 3.5-inch disk format, the controller can handle many foreign formats, such as:
AMAX Mac emulator (a special floppy of only 200KB to exchange data between Amiga and Macintosh could be formatted by the Amiga, and it could be read and written by floppy drives of both systems)
Commodore 1541 (requires 5¼-inch drive slowed to 280rpm)
The Amiga 3000 introduced a special, dual-speed floppy drive that also allowed use of high density disks with double capacity without any change to Paula's floppy controller.
Serial port
The serial port is rudimentary, using programmed input/output only and lacking a FIFO buffer. However, virtually any bit rate can be selected, including all standard rates, MIDI rate, as well as extremely high custom rates.
Origin of the chip names
The name Agnus is derived from 'Address GeNerator UnitS' since it houses all address registers and controls memory access of the custom chips.
Denise is a contrived contraction of Display ENabler, intended to continue the naming convention.
Paula is a similarly contrived contraction of Ports, Audio, UART and Logic, and coincidentally the chip designer's girlfriend.
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 sold these to the masses". It contains the same Motorola 68000 as the Amiga 1000, as well as the same graphics and sound coprocessors, but is in a smaller case similar to that of the Commodore 128.
The Atari 8-bit computers, formally launched as the Atari Home Computer System, are a series of 8-bit home computers introduced by Atari, Inc. in 1979 with the Atari 400 and Atari 800. It is the first home computer architecture with coprocessors, enabling more advanced graphics and sound than most of its contemporaries. Video games are key to its software library, and the 1980 first-person space combat simulator Star Raiders is considered the platform's killer app.
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. It was also, rather misleadingly, known as "graphics RAM".
In computer graphics, planar is the method of arranging pixel data into several bitplanes of RAM. Each bit in a bitplane is related to one pixel on the screen. Unlike packed, high color, or true color graphics, the whole dataset for an individual pixel is not in one specific location in RAM, but spread across the bitplanes that make up the display. Planar arrangement determines how pixel data is laid out in memory, not how the data for a pixel is interpreted; pixel data in a planar arrangement could encode either indexed or direct color.
Amiga Advanced Graphics Architecture (AGA) is the third-generation Amiga graphic chipset, first used in the Amiga 4000 in 1992. Before release AGA was codenamed Pandora by Commodore International.
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 another relatively quickly, and in parallel with the CPU, while freeing up the CPU's more complex capabilities for other operations. A typical use for a blitter is the movement of a bitmap, such as windows and icons in a graphical user interface or images and backgrounds in a 2D video game. The name comes from the bit blit operation of the 1973 Xerox Alto, which stands for bit-block transfer. A blit operation is more than a memory copy, because it can involve data that's not byte aligned, handling transparent pixels, and various ways of combining the source and destination data.
Interleaved Bitmap (ILBM) is an image file format conforming to the Interchange File Format (IFF) standard. The format originated on the Amiga platform, and on IBM-compatible systems, files in this format or the related PBM format are typically encountered in games from late 1980s and early 1990s that were either Amiga ports or had their graphical assets designed on Amiga machines.
The Commodore 65 is a prototype computer created at Commodore Business Machines in 1990–1991. It is an improved version of the Commodore 64, and it was meant to be backwards-compatible with the older computer, while still providing a number of advanced features close to those of the Amiga.
The TMS9918 is a video display controller (VDC) manufactured by Texas Instruments, in manuals referenced as "Video Display Processor" (VDP) and introduced in 1979. The TMS9918 and its variants were used in the ColecoVision, CreatiVision, Memotech MTX, MSX, NABU Personal Computer, SG-1000/SC-3000, Spectravideo SV-318, SV-328, Sord M5, Tatung Einstein, TI-99/4, Casio PV-2000, Coleco Adam, Hanimex Pencil II, and Tomy Tutor.
The MOS Technology "Agnus", usually called Agnus, is an integrated circuit in the custom chipset of the Amiga computer. The Agnus, Denise and Paula chips collectively formed the OCS and ECS chipsets.
Alphanumeric Television Interface Controller (ANTIC) is an LSI ASIC dedicated to generating 2D computer graphics to be shown on a television screen or computer display. Under the direction of Jay Miner, the chip was designed in 1977–1978 by Joe Decuir, Francois Michel, and Steve Smith for the Atari 8-bit computers first released in 1979. The chip was patented by Atari, Inc. in 1981. ANTIC is also used in the 1982 Atari 5200 video game console, which shares most of the same hardware as the 8-bit computers.
Hold-And-Modify, usually abbreviated as HAM, is a display mode of the Commodore Amiga computer. It uses a highly unusual technique to express the color of pixels, allowing many more colors to appear on screen than would otherwise be possible. HAM mode was commonly used to display digitized photographs or video frames, bitmap art and occasionally animation. At the time of the Amiga's launch in 1985, this near-photorealistic display was unprecedented for a home computer and it was widely used to demonstrate the Amiga's graphical capability. However, HAM has significant technical limitations which prevent it from being used as a general purpose display mode.
A display list, also called a command list in Direct3D 12 and a command buffer in Vulkan, is a series of graphics commands so that they may be later run when the list is executed. Systems that make use of display list functionality are called retained mode systems, while systems that do not are as opposed to immediate mode systems. In OpenGL, display lists are useful to redraw the same geometry or apply a set of state changes multiple times. This benefit is also used with Direct3D 12's bundle command lists. In Direct3D 12 and Vulkan, display lists are regularly used for per-frame recording and execution.
A video display controller (VDC), also called a display engine or display interface, is an integrated circuit which is the main component in a video-signal generator, a device responsible for the production of a TV video signal in a computing or game system. Some VDCs also generate an audio signal, but that is not their main function. VDCs were used in the home computers of the 1980s and also in some early video picture systems.
A raster interrupt is an interrupt signal in a legacy computer system which is used for display timing. It is usually, though not always, generated by a system's graphics chip as the scan lines of a frame are being readied to send to the monitor for display. The most basic implementation of a raster interrupt is the vertical blank interrupt.
The AAA chipset was intended to be the next-generation Amiga multimedia system designed by Commodore International. Initially begun as a secret project, the first design discussions were started in 1988, and after many revisions and redesigns the first silicon versions were fabricated in 1992–1993. The project was stymied in 1993 based on a lack of funds for chip revisions.
Hombre is a RISC chipset for the Amiga, designed by Commodore, which was intended as the basis of a range of Amiga personal computers and multimedia products, including a successor to the Amiga 1200, a next generation game machine called CD64 and a 3D accelerator PCI card. Hombre was canceled along with the bankruptcy of Commodore International.
The AA+ chipset was a planned Amiga-compatible chipset that Commodore International announced in 1992. There were two separate projects: the next generation Advanced Amiga Architecture chipset and the lower cost, more pragmatic AA+ chipset. The former was in development when Commodore declared bankruptcy; the latter existed only on paper. Both were cancelled when Commodore folded.
In addition to the Amiga chipsets, various specially designed chips have been used in Commodore Amiga computers that do not belong to the 'Amiga chipset' in a tight sense.
References
Miner, Jay et al. (1991). Amiga Hardware Reference Manual: Third Edition. Addison-Wesley Publishing Company, Inc. ISBN0-201-56776-8.INTERVIEW | Glenn Keller - Commodore Amiga Paula Chip Designer
↑ The BLTSIZE register holds six bits for horizontal words and ten bits for vertical lines.
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