The host has ultimate control over the bus and may inhibit communication at any time by pulling the Clock line low.
How to pull the Clock line low in assembly and release in windows?
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A:
Short answer: you can't. Not on Windows NT/2K/XP/Vista/7 anyway.
The instructions to do this kind of thing are blocked by the NT kernel. It would be a security flaw if you had access to them (a virus could disable your keyboard for example).
If you really need to disable all communication over the PS/2 bus, you would have to write a driver. You would probably want to do that in C, not assembler, since it is quite complicated.
Callum
2010-08-01 22:14:05