The PC 99 System Design Guide, including the PC 99 Addendum, provides a guide for engineers who build personal computers, expansion cards, and peripheral devices that will be used with the Microsoft® Windows® 32-bit operating systems and that incorporate legacy components.
The PC 99 System Design Guide combined with the PC 99 Addendum is available at http://www.pcdesguide.org/PC99a/default.htm. It will remain as the current PC design guidelines until PC 2001 System Design Guide becomes available.