The Compaq Portable III is a computer released by Compaq Computer Corporation in 1987. It was advertised as being much smaller and lighter than the previous portable x86-PCs, however it was still quite large by today's standards. Its street price upon its release was 4999 USD for a model equipped initially with an 12 MHzIntel 80286 and later 20 MHzIntel 80386CPU, 640 KBRAM, 1.2 MB 5.25"floppy, 20 /40 /60 MB hard disk, and a 10" amber colored gas-plasma display or 5799 USD with the upgraded 40 MB hard disk. There was also an optional ISA Expansion chassis allowed for 2 full length 16-bit ISA add-in cards for 199 USD. Power is supplied using a mains electricity outlet, no battery exists.