ThinkPad 600 series
The 600 series was designed as a slimline productivity model. It was the first of its kind with a lightweight and slim design. It was the parent to the T Series line of ThinkPads. With its release came the UltraSlim Bay, a thinner and lighter version of the Ultra Bay. Quite possibly the most popular ThinkPad series in existence. Many can be found easily on auction sites.
ThinkPad 600 contained either a Pentium MMX or Pentium II processor. It was paired with a discrete NeoMagic MagicGraph 128XD with 2 MB VRAM.
ThinkPad 600E contained either a Pentium II or Celeron processor. It was paired with a discrete NeoMagic 256AV with 2.5 MB of VRAM. The first in the series to fully shift to TFT LCD displays from HPA.
ThinkPad 600X contained a Pentium III processor of varying speeds. It was paired with a discrete NeoMagic 256ZX with 4 MB of VRAM.