Chris_C Posted December 15, 2013 Report Share Posted December 15, 2013 http://www.instructables.com/id/USB-to-PS2-convertor/?ALLSTEPS its always puzzled me that you can plug a USB keyboard into a ps2 connector, do all keyboards have a legacy mode? can this be relied on in future? can I just plug in the d+ and d- and treat them as ps2 data and clock? and just make my own ps2 interface circuit? getting a ps2 keyboard is like getting hens teeth from a snow hen in the Caribbean now a days... Link to comment Share on other sites More sharing options...
Jack Gassett Posted December 15, 2013 Report Share Posted December 15, 2013 Hmmm, this is very interesting to know!! Anyone have any insight? Jack. Link to comment Share on other sites More sharing options...
Chris_C Posted December 16, 2013 Author Report Share Posted December 16, 2013 http://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=12&ved=0CDQQFjABOAo&url=http%3A%2F%2Fwww.digchip.com%2Fdata%2F613%2F613-00010-0-MTP805A.pdf&ei=uqiuUraSI4TBhAfYvoG4Aw&usg=AFQjCNGU3s2Ftv5M2BoZf53mYfKxIStXwQ&sig2=LKM-PnRhlhPmzjfVKDL1ow sorry link on my tablet couldn't get the actual link but that should get you the PDF... page 10 mentions a pull down resistor on USB hubs and ps2 mode... lets hope keyboard manufacturers keep legacy PS/2 mode alike! will research more! Link to comment Share on other sites More sharing options...
Chris_C Posted December 16, 2013 Author Report Share Posted December 16, 2013 http://www.beyondlogic.org/usbnutshell/usb2.shtml looks like its to do with speed nagotiation... if I can dig out my 5v to 3v3 convertor I'll have a look when I get chance, but do feel free to beat me too it, I'll have to implement some come stuff to get data off my fpga!! Link to comment Share on other sites More sharing options...
james1095 Posted December 16, 2013 Report Share Posted December 16, 2013 In a previous job I worked in the hardware group at a large tech company, some of which included mice and keyboards. This was during the PS/2 to USB transition period in the early 2000's and our devices had a legacy mode built into the ASICs embedded in them. The PS/2 to USB adapters were passive and would only work with keyboards and mice that had dual modes. We also had mice that could connect to PS/2 or serial the same way. I just had a look on ebay and there are dozens of PS/2 keyboards listed. Amazon has loads of them too. You might also try a thrift store or computer recycling center, I still see PS/2 types frequently. Link to comment Share on other sites More sharing options...
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