The ill-fated Jag featured a Motorola 68000 CPU, augmented by Tom & Jerry co-processors, with 2MB RAM, and up to 6MB ROM.
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Anyone wishing to port Linux to the Atari Jaguar would face numerous constraints due to the hardware. One of the first hurdles successfully leaped by cakehonolulu was the CPU used. Atari’s system designers architected the Jag using a Motorola 68000 CPU, which was already pretty old at the time, but a moderately fast 13.3 MHz version was selected. Though the gaming prowess of the console was lifted by custom co-processors dubbed Tom & Jerry, some games didn’t make much use of this graphics and DSP acceleration, as it was notoriously difficult to tap into.
For this Linux port, the general CPU capabilities of the M68000 would also be targeted to run the OS. With that in mind, and knowing that the CPU lacked an MMU, cakehonolulu was lucky to find that classic Motorola 68k processors are still supported by Linux, and also the uClinux project, which allows Linux to run on MMU‑less systems like the Jaguar.
While these prior works were helpful, it wasn’t long until the linux_jag developer needed to battle with other Atari Jaguar constraints. The console comes with just 2MB of RAM and up to 6MB of ROM, which is incredibly miserly compared to even the cheapest microcontrollers and SBCs nowadays. Much RAM and storage optimization later, cakehonolulu tripped over a few issues getting Linux to boot on the Jaguar, and ended up implementing a console driver for Tom so the OS would work on real hardware.
Atari’s Jaguar was released with great pride by the iconic video game company in 1993. It was controversially claimed to be the world’s first 64-bit console, but it still never managed to push aside incumbent previous-gen machines from Sega (Genesis / Mega Drive) or Nintendo (Super NES).
HamsterOS jams a 32-bit GUI operating system in a single 1.44 MB floppy disk
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Reference reading
- https://www.tomshardware.com/software/linux/SPONSORED_LINK_URL
- https://www.tomshardware.com/software/linux/dev-ports-linux-to-ataris-notorious-jaguar-console-from-1993-the-first-64-bit-console-features-2mb-of-ram-13-3-mhz-cpu-and-tom-and-jerry-co-processors-the-jag-was-notoriously-difficult-to-program-and-flopped#main
- https://www.tomshardware.com/membership
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