On Fri, 13 Jun 2008 20:23:36 -0700 (PDT), b
put finger to keyboard and composed:

I have this keyboard (for PC), with a strange fault.
you can type normally then after a few seconds it stops responding in
certain parts - notably the top row of letters ISTR. I find that if
you type slowly, it is a bit more receptive. seems like there's some
kind of 'memory effect' going on.

I know normally this would be a no-brainer, as these aren't worth
repairing, but it's a nice 'clicky' one which responds well to the
touch when it works, so if it is something simple I'd have a go at a
fix..... any thoughts?
-B

If there is a problem with the key matrix, it will show up as a dead
row or a dead column. Note that physical rows and columns do not
usually correspond to electrical rows and columns.

You can use this old DOS program in real DOS mode to report the scan
codes of each key:
http://www.users.on.net/~fzabkar/SCAN.COM (172 bytes)

There are two sets of scan codes for each key, one pair for key press,
and a second pair for key release.

Otherwise Microsoft's Intellitype software includes an mskey.exe
diagnostic test which displays and logs the scan codes of each key. I
believe it should work with a standard 101 keyboard.

For example, here are the scan codes for my Microsoft Wireless Desktop
Elite keyboard, model 1011:
http://www.users.on.net/~fzabkar/MSKeyLog.TXT

You may find the following document interesting.

MS Keyboard Scan Code Specification:
http://download.microsoft.com/downlo...c/scancode.doc

- Franc Zabkar
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