while you are in an interrupt handler you are in CLI state. So an HLT without a STI before it would hang the system. The _int28_handler is only an iret as far as I remember, and it is shared with int 22 and 2a. I do not think that ALL three interrupts should contain HLT (which usually waits up to 0.05 seconds until the next timer tick happens). So please check that suggestion again...
You're right of course, but that was just a rough idea of mine. The labels must be reordered so only _int28_handler goes through the HLT and a STI must be added before it. When Bart fixes the fnodes bug, it will be the right time to start adding little nice features like this one... ;-)
Lucho
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