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PS2 keyboard quirks

 
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jbmiller



Joined: 07 Oct 2006
Posts: 73
Location: Greensville,Ontario

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PS2 keyboard quirks
PostPosted: Mon Feb 05, 2007 6:43 pm     Reply with quote
Hello. While converting my ASM PS2 keyboard translator program over to CCS C(something to do as it's cold here) I've uncovered a quirk. Seems all the 'enhanced' or 'extended' keys(Insert,home,pageup,end,etc.) have a 0xC0 prefix byte instead of the usual break code(0xE0).Arrgh! Example.Insert key Make= 0xE0,0x70 Break should be 0xE0,0xF0,0x70. I get 0xC0,0xF0,0x70.
I have confirmed this on 2 different keyboards.If it was a 'timing' issue corrupting the data stram,I'd expect the program to display other symptoms.ONLY the enhanced key 'subset' give this problem.
Anyone else seen this, comments ? Thanks Jay
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