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There exists SPARC based, laptops.

They are not very widespread but, they are actually very good SPARC workstations.

SparcBook 1:
SparcBook 2:
Tadpole SparcBook 3GX: This is a 100Mhz MicroSPARC II (TI) with a Weitek P9100 frame buffer and a screen resolution of 800x600. GNU/Linux runs on it The PCMCIA, internal modem and power management are not supported at the time of this writing.

For more information about the SPARCBooks there exists a SPARCBook FAQ, you can read it at http://hvdkooij.xs4all.nl/docs/SparcBook-FAQ.html

There exists a Linux Mobile Guide that provides you with the needed informations about GNU/Linux on laptops. You can read it there: http://www.tuxmobil.org/Mobile-Guide.db/Mobile-Guide.html

Today there are some manufacturers of SPARC based laptops. You can access their websites at

Tadpole: http://www.tadpolecomputer.com/html/
Nextcomputing: http://www.nextcomputing.com At least one of their laptops, the NextBlade 150 is advertised as being capable to run both Solaris and the RedHat GNU/Linux.