USB to ps2


Chris_C

Recommended Posts

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

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

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

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.