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Andy Neil
11/29/13 01:28
  11/29/13 03:40

Read: 1015 times

#190171 - "working fine" (sic)
Responding to: Mohit Gupta's previous message
That probably means that your code is flawed, but you just happened to get away with it on the "old" keyboards.

Look at your code very carefully and make fully sure that you are completely & correctly following the PS/2 protocol. Pay particular attention to timing.

Use an oscilloscope to observe the signalling with both old & new keyboards.

"(black color) ps2 keybords are not working;
(white color) working fine"

Clearly the colour itself is irrelevant?

Are all the black keyboards the same make, model & revision?
Are all the white keyboards the same make, model & revision?

I take it the black keyboards do actually work with PCs...?

Do the new keyboards have extra features - such as automatically switching to USB or PS/2?

"Suggest solution"

Get debugging!


I note that you refer to "keyboards" (both black and white) in the plural - so how many of each have you tried?

List of 16 messages in thread
Old PS2 Keyboards (White) Working, New Keyboard not working      Mohit Gupta      11/28/13 23:59      
   "working fine" (sic)      Andy Neil      11/29/13 01:28      
      PS2 Keyboards are not working      Mohit Gupta      12/01/13 22:00      
          "working fine" (sic)       Andy Neil      12/02/13 02:21      
   Maybe this will help      Richard Erlacher      12/04/13 11:19      
      Here's a link that might be useful      Richard Erlacher      12/20/13 05:30      
         Dead horse?      Andy Neil      12/20/13 15:33      
            Far too many queries fail to define "working"        Richard Erlacher      12/21/13 01:13      
               Working      Mahmood Elnasser      12/21/13 01:34      
               RE: Far too many queries fail to define "working"      Andy Neil      12/21/13 02:18      
               The difference between "Engineering" and just hacking?      Andy Neil      12/21/13 02:48      
                  The core of engineering is not experimenting        Richard Erlacher      12/24/13 02:03      
                     experimenting equals ....      Erik Malund      12/25/13 10:23      
                        Yes ... likewise, believing the first page of the datasheet      Richard Erlacher      12/26/13 01:16      
                           RE: believing the first page of the datasheet      Andy Neil      12/26/13 06:56      
                              Exactly!      Richard Erlacher      12/26/13 13:37      

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