The T1100 ran MS-DOSMicrosoft Disk Operating System — the OS bundled with early IBM PCs and PC compatibles. 2.11 on a rechargeable battery — one of the first clamshell laptops that could run standard PCPersonal computer — a computer designed for individual use, especially desktop or laptop machines. software on the road. European and Japanese business users adopted it before US vendors caught up. It proved the IBMInternational Business Machines — a major computer and enterprise technology company since the early 20th century. PCPersonal computer — a computer designed for individual use, especially desktop or laptop machines. standard could shrink into a portable form without custom operating systems.

The T1100 was among the first IBMInternational Business Machines — a major computer and enterprise technology company since the early 20th century. PCPersonal computer — a computer designed for individual use, especially desktop or laptop machines.-compatible laptops sold internationally.

It brought DOSDisk Operating System — an OS centered on disk storage; often refers to MS-DOS on PCs. compatibility to mobile form factors before the ThinkPad era.