== Color-coding scheme for connectors and ports ==
The perhaps most end-user visible and lasting impact of PC 99 was that it introduced a [[color code]] for the various standard types of plugs and connectors used on PCs. <ref>[ftphttp://downloadwww.intelmicrosoft.com/design/pc98whdc/pc99archive/Pc_99_1pcguides.pdfmspx PC 99 System Design Guide], Intel Corporation and Microsoft Corporation, 14 July 1999. Chapter 3: PC 99 basic requirements ([http://downloadwww.microsoft.com/downloadwhdc/win2000proarchive/PCG/1pcguides.0/NT5/EN-US/pc99v1a.exemspx pc99_c03.docPC in99 ZIPSystem fileDesign Guide (Self extracting .exe]). Requirement 3.18.3: Systems use a color-coding scheme for connectors and ports. Accessed 2009-02-05</ref> As many of the connectors look very similar, particularly to a novice PC user, this made it far easier for people to connect peripherals to the correct ports on a PC. This color code was gradually adopted by almost all PC and [[PC motherboard|motherboard]] manufacturers. Some of the color codes have also been widely adopted by peripheral manufacturers.
