Amiga Hombre chipset

Source: Wikipedia, the free encyclopedia.

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[1] and a 3D accelerator PCI card. Hombre was canceled along with the bankruptcy of Commodore International
.

History

In 1993, Commodore International ceased the development of the

PC clones
would have similar performance shortly after the AAA machines would be released.

In the place of AAA, Commodore began to design a new 64-bit 3D graphics chipset based on Hewlett-Packard's PA-RISC architecture to serve as the new basis of the Amiga personal computer series. It was codenamed Hombre (pronounced "ómbre" which means man in Spanish) and was developed in conjunction with Hewlett-Packard over an estimated eighteen-month period.

Backward compatibility

Hombre does not support any planar mode, nor any emulation for the legacy Amiga chipset or Motorola 680x0 CPU registers, so it was completely incompatible with former Amiga models. According to Hombre designer Dr. Ed Hepler, Commodore intended to produce an AGA Amiga upon a single chip to solve the backward compatibility issues. This single chip would include Motorola MC680x0 core, plus the AGA chipset. The chip could be integrated in Hombre based computers for backward compatibility with AGA software.[2]

Design

Hombre is based around two chips: Nathaniel, a System Controller chip, and Natalie, a Display Controller chip.

The System Controller chip was designed by Dr. Ed Hepler, well known as the designer of the AAA Andrea chip. The chip is similar in principle to the chip bus controller found in Agnus, Alice, and Andrea of the

Amiga chipsets
. Nathaniel features the following:

Additional logic has been included to permit some floating point operations to be performed in hardware; a floating point register file is included.

The inclusion of a

floating point unit
was also under consideration.

The Display Controller Chip was designed by Tim McDonald, also known as the designer of the AAA Monica chip. It is similar in principle to the Denise, Lisa, and Monica chips found on original Amigas. In addition, the chipset also supported future official or third-party upgrades through extension for an external PA-RISC processor.

Natalie features the following:

These chips and some other circuitry would be part of a

ReTargetable Graphics
system.

Additional IO for peripherals such as floppy drive, keyboard and mice would have been provided with a separate dedicated peripheral ASIC.

There were plans to port the AmigaOS Exec kernel to low-end systems, but this was not possible due to financial troubles facing Commodore at that time. Therefore, a licensed OpenGL library was to be used for the low-end entertainment system.

The original plan for the Hombre-based computer system was to have

64-bit MIPS R4200
, but it was rejected for its high price at the time.

Features

Hombre was designed as a clean break from traditional Amiga chipset architecture with no planar graphics mode support. Hombre also doesn't feature the original eight Amiga sprites, early iterations of Hombre featured a new, incompatible sprite engine but Commodore decided to drop sprites because sprites had become less attractive to developers compared with fast blitters. Despite lack of compatibility, Hombre introduced modern technologies including these:

The chipset could be sold either as a high end

32-bit DRAM. It could also be used for set-top box
embedded systems.

According to Dr. Ed Hepler, Hombre was to be

0.6 µm 3-level metal CMOS with the help of Hewlett-Packard. HP had fabricated the AGA
Lisa chip and collaborated in the design of the AAA chipset.

Commodore was planning to adopt the Acutiator architecture designed by Dave Haynie for Hombre before it filed bankruptcy and went out of business.

See also

References

  1. ^ Dave Haynie (January 24, 1995). "CBM's Plans for the RISC-Chipset". Gareth Knight. Archived from the original on July 3, 2008. Retrieved January 31, 2010. The initial schedule of 18 months was for the Hombre game machine hardware. There's no real OS here, just a library of routines, including a 3D package which would probably be licensed. The Amiga OS was not to have run on this system in any form.
  2. SIMD
    processor for graphics, etc.

External links

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