IBM PC celebrates 25th anniversary

DOS 1.0 Booting close up

On boot DOS would ask for the date and then drop you to an A> prompt. There was no colon and there was no C> because the original PC wouldn't support hard drives or sub directories.

The PC also didn't have any sort of BIOS configuration utility. The system was configured by setting up a couple of sets of dip switches on the motherboard. One switch indicated whether you had a monochrome or color card installed. The one next to it indicated the default video mode (40 or 80 column.) Others set memory size.

Reprinted with permission from Vintage-Computer.com

About Bill Detwiler

Bill Detwiler is Managing Editor of TechRepublic and Tech Pro Research and the host of Cracking Open, CNET and TechRepublic's popular online show. Prior to joining TechRepublic in 2000, Bill was an IT manager, database administrator, and desktop supp...

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