CNET's David Carnoy has detailed a little-known part of Apple's past, the WalkMac, after his brother-in-law rediscovered a forgotten model in his basement. Officially sanctioned by Apple and launched in 1987, the system was built by Colby Systems and was the first portable computer to run Apple software. It predates Apple's first forray into mobile computing, the Macintosh Portable, which came two years later in 1989. Bought for "around $6,000," the Walkmac ran OS 6 on a 16Mhz processor, and came with just 1MB memory. It's likely to be worth a lot more than $6,000 now. For more pictures of the ancient portable, head over to CNET.