A full 608 pages of DOS command references through Version 6.2 (200 pages), PC industry phone book for over 2,000 companies, CD-ROM configurations for over 924 drives, disk configuration for over 4,545 hard drives and 500 floppy drives, CPU processor table for 237 processors, printer control codes, ASCII codes, PC error codes, memory and address maps, modem commands and switch settings, port and cable pinouts and much, much more. If you work on PCs you need this book!