1.4.3. Batteries
The available battery types are Lithium Ion (LiIon), Nickel Metal Hydride ( NiMH) and Nickel Cadmium
(NiCd). Though almost all current laptops come with LiIon batteries.
LiIon batteries are the most expensive ones but a lot lighter than NiCd for the same energy content, and have
minimal - but present - memory effects. NiMH is better than NiCd, but still rather heavy and does suffer some
(although less than NiCd) memory effects.
Unfortunately most laptops come with a proprietary battery size. So they are not interchangeable between
different models.
1.4.4. CPU
1.4.4.1. Supported CPU Families
For details about systems which are supported by the Linux Kernel, see the The linux-kernel mailing list
FAQ.
i286: Linux doesn't support this CPU family yet. But there are some efforts at ELKS. If you like, you
may use Minix, which is also a free Unix operating system. Minix supports 8088 to 286 CPUs with as
little as 640K memory. Actually there are some laptops with ELKS and MINIX around.
1.
i386: This covers PCs based on Intel-compatible processors, including Intel's 386, 486, Pentium,
Pentium Pro and Pentium II, and compatible processors by AMD, Cyrix and others. Most of the
currently available laptops use Intel compatible CPUs and have quite good Linux support.
2.
m68k: This covers Amigas and Ataris having a Motorola 680x0 processor for x>=2; with MMU. And
the early Apple/Macintosh computers.
There was a long series of Apple PowerBooks and other laptops based on the m68k chip. Macintosh
Portable (an ugly 16-pound first attempt); PowerBook 100, 140, 170, 145, 160, 180c, 165c, 520c,
540c, 550c, 190; Duo 210, 230, 250, 270c, 280. The PowerBook Duos were available at the same
time as the PowerBooks, they were a sort of subnotebook, but were designed so that you could plug
them into a base station (a DuoDock) with more RAM, peripherals, etcetera, so that they could also
act as a desktop computer. The first PowerPC PowerBooks were the ill-starred PowerBook 5300
(after the 190) and the Duo 2300c.
For a complete list of all Macintosh computers ever made, with specifications, see Apple-History .
For Linux installation reports see Linux Laptop and Notebook Survey: Apple.
The proper place to go for information on running Linux on m68k Macintoshes is linux-m68k.
"Much like laptops of the Intel/Linux world, Mac laptops have generally different setups that can be
very hard to figure out. Also, because of a general lack of machines to test, we are only aware of
boots on the Powerbook 145, Powerbook 150, Powerbook 170, Powerbook 180, and Powerbook 190.
Even if it boots, we currently have no support for Powerbook-style ADB, the APM support, or just
about anything else on them. This means the only way to log in is with a terminal hooked up to the
serial interface, this has been tested on the 170."
"Several Powerbooks have internal IDE which is supported. PCMCIA drivers will be forthcoming if
someone can supply the necessary hardware information to write a driver. As always, an FPU is
3.
Linux on the Road
Chapter 1. Which Laptop to Buy? 7
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