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\$\begingroup\$ I am quite aware you can get ready made off the shelf adaptors to connect old ps/2 keyboards to USB. But I am curious as how would one do it themselves? I have tried just rewiring an old keyboard to a USB cable as they both have 5V and ground and 2 data connections. Though USB has a differential DATA +- and ps/2 has a data and clock wire. So after trying a basic rewiring it didn't work so there has to be some conversion going on but what? The puzzling thing is going from USB to PS/2 works but going the other way doesn't work. Why? Edit Ok so in some more research, I think I understand the why now. As USB devices need to be registered and be able to give data to the OS about what it is when requested by the OS. ie. report back a VID and HID code. Although all the 'scan codes' that the keyboard sends to the system should still work with modern systems. As this was based on the original IBM PS/2 AT keyboards and this protocol has been carried though to today. Edit 2 More info found on the electrical interface needed here. It seems its a not that easy but doable task to create your interface with the use of a cheap microcontroller. The connection between the microcontroller and the ps/2 keyboard seems straight forward enough but then from the microcontroller to USB is another story... Edit 3 After a bit more searching I discovered that Microchip released a Technical Brief with quite a complete guide on how to do exactly what I was after! Its TB055 and includes the source code for PIC uC. asked Dec 2, 2016 at 1045 crowiecrowie5221 gold badge3 silver badges10 bronze badges \$\endgroup\$ 4 \$\begingroup\$ The converters like these are just for the connections. It will not make a USB-only keyboard work in PS/2. It will not make a PS/2-only keyboard work on USB. The keyboard that came with such an adapter was capable of both USB and PS/2 connections. It detects if it is plugged into a USB port or a PS/2 port and then adapts to that connection type. answered Dec 2, 2016 at 1053 gold badges93 silver badges183 bronze badges \$\endgroup\$ 4
Specs Premium USB to Dual PS/2 Y Adapter for Windows/Mac/Linux Keyboard & Mouse,Bar Code Scanner. Connects PS/2 mouse and keyboard through USB port on any computer. Compliant with the Standard Specification of USB 1.0 and 1.1. Converts two PS/2 devices (Keyboard and Mouse) to the USB Interface. Converts the PC PS/2 port of KVM switch to USB
Femaleto USB Male Dual PS/2 PS2 Cable Adapter Converter For Keyboard Mouse. Neu · Gewerblich. EUR 1,59. + EUR 3,50 Versand. Verkäufer 99.6% positiv.
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