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The 'Jaguar II' prototype

This is the 'Jaguar II' prototype PCB. You'll notice, there is a second DRAM-bank on the board; but it's empty...

These are the expansion-ports of the 'Jaguar II'. What is / was the new expansion-bus for?


Those are (were) the possible 'Jaguar II' system-specs. They were stated in a german online-magazine in 1995. The editors claimed, that they received these specs from Atari-internal sources they were not able to reveal.

So let's consider these as speculative, but not unrealistic:

Size: 10.5" x 12" x 3.5"
Controls: Power on/off
Display: Resolution up to 1600 x 600 pixels (50 Hz/interlace)
32-bit 'Extended True Color' display with 16,777,216 colors simultaneously (additional 8 bits of supplimental graphics data support possible)
Multiple-resolution, multiple-color depth objects (monochrome, 2-bit, 4-bit, 8-bit, 16-bit, 24-bit) can be used simultaneously
Ports: Cartridge slot/expansion port (64 bits)
RF video output
Video edge connector (video/audio output) (supports NTSC and PAL; provides S-Video, Composite, RGB outputs, accessible by optional add-on connector)
Four controller ports
Digital Signal Processor port (includes high-speed synchronous serial input/output)
Controllers: Eight-directional joypad, size 5" x 4.5" x 1.5", cord 7 feet, six fire buttons (A, B, C, D, E, F), pause and Option buttons, 12-key keypad (accepts game-specific overlays)
   
   
'Tom' (including processors 1-5), 1,250,000 transistors, 292 pins
Graphics Processing Unit (processor #1) 64-bit RISC architecture (64 / 128 register processor)
64 registers of 128 bits wide (shadow-buffering)
Has access to all 2 x 64 bits of the system bus
Can read 128 bits of data in one instruction
Rated at 127.902 MIPS (million instructions per second)
Runs at 63.951 MHz
2 x 32K bytes of zero wait-state internal SRAM (matrix)
Performs a wide range of high-speed graphic effects
Programmable
Object processor (processor #2) 64-bit RISC architecture
Programmable processor that can act as a variety of different video architectures, such as a sprite engine, a pixel-mapped display, a character-mapped system, and others.
Blitter (processor #3) 64 bits read and write at the same time! (multibuffering)
8K read buffer (fifo)
8K write buffer (lifo)
Performs high-speed logical operations
Hardware support for Z-buffering and Gouraud shading
Texture Mapping Engine (processor #4) 64-bit RISC
256K 'texture-work-ram' of zero wait-state internal CACHE
capable of doing about 900000 texture-mapped polyons,
without textures there can do 2500000 polyons.
realtime Gouraud and Phong shading
J/MPEG 'COMBI' Chip (processor #5) 64 bits
not programmable
8K own data rom (with sinus) table
128K CACHE (fifo)
realtime J/MPEG decompression via CACHE (fifo)
DRAM memory controller
4 x 64 bits
Accesses the DRAM directly
   
   
'Jerry', 900,000 transistors, 196 pins  
Digital Signal Processor (processor #6) 32 bits (32-bit registers)
Rated at 53,3 MIPS (million instructions per second)
Runs at 53.3 MHz
Same RISC core as the Graphics Processing Unit
Not limited to sound generation
96K bytes of zero wait-state internal SRAM
CD-quality sound (16-bit stereo 50KHz)
Number of sound channels limited by software (minimum 16)
Two DACs (stereo) convert digital data to analog sound signals
Full stereo capabilities
Wavetable synthesis, FM synthesis, FM Sample synthesis, and AM synthesis
A clock control block, incorporating timers, and a UART
Motorola 68EC020 (processor #7) Runs at 26.590MHz
perfect 68000 emulation
General purpose control processor

Communication is performed with a high speed 64-bit data bus, rated at 2400 megabits / second. The 68000 is only able to access 16 bits of this bus at a time.

The 'Jaguar II' contains eight megabytes (64 megabits) of fast page-mode DRAM, in eight chips with 1024 K each.

The 'Jaguar II' would have had seven processors, which are contained in three chips. Two of the chips are proprietary designs, nicknamed 'Tom' and 'Jerry'. The third chip is a standard Motorola 68EC020, used as a coprocessor. 'Tom' and 'Jerry' are built using an 0.3 micron silicon process. With proper programming, all seven processors can run in parallel.



These two pictures were taken at the 1995 Summer CES in Chicago: Sam Tramiel carrying a 'JagDuo' (a combination of the Jaguar and the CD add-on), or possibly the 'Jaguar II'.

This may have been the case for the 'Jaguar II' or probably the 'JagDuo' (a combination of the Jaguar and the CD add-on).

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