Why do some older computers have 2 different power plugs on the power supply? One of the power plugs looks like it has the opposite connection to the type we use nowadays. -
![ABC Products USA United States America Canada C13 Kettle PC Computer Power Supply Adapter IEC Cord Mains Cable Lead Plug for Monitor, Printer, Photocopier, Screen, TV, Treadmill, Audio, Amp 1.8M Long : ABC Products USA United States America Canada C13 Kettle PC Computer Power Supply Adapter IEC Cord Mains Cable Lead Plug for Monitor, Printer, Photocopier, Screen, TV, Treadmill, Audio, Amp 1.8M Long :](https://m.media-amazon.com/images/I/71fMjJctCyL._AC_SS450_.jpg)
ABC Products USA United States America Canada C13 Kettle PC Computer Power Supply Adapter IEC Cord Mains Cable Lead Plug for Monitor, Printer, Photocopier, Screen, TV, Treadmill, Audio, Amp 1.8M Long :
![PC Power Supply Voltage Data and Connector Types - Free Knowledge Base- The DUCK Project: information for everyone PC Power Supply Voltage Data and Connector Types - Free Knowledge Base- The DUCK Project: information for everyone](http://wiki.robotz.com/images/c/c2/PowerSupplyVoltageDataforPersonalComputers03.png)
PC Power Supply Voltage Data and Connector Types - Free Knowledge Base- The DUCK Project: information for everyone
![Japan Plug IEC 60320 C13 Monitor Power Cord ( PC Power Cord / Computer Power Cord / AC Power Cable ) in Custom Long , Color - Cablesgo Japan Plug IEC 60320 C13 Monitor Power Cord ( PC Power Cord / Computer Power Cord / AC Power Cable ) in Custom Long , Color - Cablesgo](https://www.cablesgo.com/wp-content/uploads/2018/08/Japan-power-cord-IEC-C-13.jpg)
Japan Plug IEC 60320 C13 Monitor Power Cord ( PC Power Cord / Computer Power Cord / AC Power Cable ) in Custom Long , Color - Cablesgo
Common Computer Power Supply Connectors - Rectangular Connectors - Electronic Component and Engineering Solution Forum - TechForum │ Digi-Key
Common Computer Power Supply Connectors - Rectangular Connectors - Electronic Component and Engineering Solution Forum - TechForum │ Digi-Key
![C13 Power Cord EU Type Plug, 180cm (PC-C13-EU-180CM) - The source for WiFi products at best prices in UK - wifi-stock.co.uk C13 Power Cord EU Type Plug, 180cm (PC-C13-EU-180CM) - The source for WiFi products at best prices in UK - wifi-stock.co.uk](https://www.wifi-stock.co.uk/full/c13-eu-power-cord.jpg)
C13 Power Cord EU Type Plug, 180cm (PC-C13-EU-180CM) - The source for WiFi products at best prices in UK - wifi-stock.co.uk
![XINYUWIN UK 3 Prong 5FT Kettle Lead IEC C13 Universal AC Power Cord Compatible with Personal Computer, PC Monitor, Plasma TV, Printer Power Supply Replacement Cable: Amazon.co.uk: Electronics & Photo XINYUWIN UK 3 Prong 5FT Kettle Lead IEC C13 Universal AC Power Cord Compatible with Personal Computer, PC Monitor, Plasma TV, Printer Power Supply Replacement Cable: Amazon.co.uk: Electronics & Photo](https://m.media-amazon.com/images/I/61avPUTvI2L._AC_SY450_.jpg)
XINYUWIN UK 3 Prong 5FT Kettle Lead IEC C13 Universal AC Power Cord Compatible with Personal Computer, PC Monitor, Plasma TV, Printer Power Supply Replacement Cable: Amazon.co.uk: Electronics & Photo
![PC Power Supply Voltage Data and Connector Types - Free Knowledge Base- The DUCK Project: information for everyone PC Power Supply Voltage Data and Connector Types - Free Knowledge Base- The DUCK Project: information for everyone](http://wiki.robotz.com/images/e/e8/Connector-Picture-Chart.jpg)
PC Power Supply Voltage Data and Connector Types - Free Knowledge Base- The DUCK Project: information for everyone
![Iec C13 Power Supply Cord 0.5m 1.5m 2m 3m 5m Swiss Plug Power Cable For Dell Pc Computer Monitor Printer Lg Tv Projector Radio | Fruugo UK Iec C13 Power Supply Cord 0.5m 1.5m 2m 3m 5m Swiss Plug Power Cable For Dell Pc Computer Monitor Printer Lg Tv Projector Radio | Fruugo UK](https://img.fruugo.com/product/7/06/210550067_max.jpg)
Iec C13 Power Supply Cord 0.5m 1.5m 2m 3m 5m Swiss Plug Power Cable For Dell Pc Computer Monitor Printer Lg Tv Projector Radio | Fruugo UK
![10ft (3m) 18 AWG Computer Power Extension Cord (IEC320C14 to IEC320C13) (TAA Compliant) | AC Power Cords | Power Cords | Power Charging and Cable Management 10ft (3m) 18 AWG Computer Power Extension Cord (IEC320C14 to IEC320C13) (TAA Compliant) | AC Power Cords | Power Cords | Power Charging and Cable Management](https://cdn2.webdamdb.com/1280_oEefV0Uuv6u41oCd.jpg?1632155502)
10ft (3m) 18 AWG Computer Power Extension Cord (IEC320C14 to IEC320C13) (TAA Compliant) | AC Power Cords | Power Cords | Power Charging and Cable Management
![Dongguan Guangying Eu Uk Italy Type 110v/220v Pc Power Supply Cable For Laptop/desktop Computer - Buy Ac Cable,Ac Power Cable,Ac Power Cord Product on Alibaba.com Dongguan Guangying Eu Uk Italy Type 110v/220v Pc Power Supply Cable For Laptop/desktop Computer - Buy Ac Cable,Ac Power Cable,Ac Power Cord Product on Alibaba.com](http://sc04.alicdn.com/kf/H11fae1167874436bab3d8e62a3ab2b252.jpg)
Dongguan Guangying Eu Uk Italy Type 110v/220v Pc Power Supply Cable For Laptop/desktop Computer - Buy Ac Cable,Ac Power Cable,Ac Power Cord Product on Alibaba.com
![PC Power Supply Voltage Data and Connector Types - Free Knowledge Base- The DUCK Project: information for everyone PC Power Supply Voltage Data and Connector Types - Free Knowledge Base- The DUCK Project: information for everyone](http://wiki.robotz.com/images/8/84/PowerSupplyVoltageDataforPersonalComputers08.jpg)