7393

Snapshot. Keyboard interrupt being triggered.

This was hard to debug until https://stackoverflow.com/questions/37618111/keyboard-irq-within-an-x86-kernel
reminded me that I'd forgotten to enable IRQ1 on port 0x21.

For a while I was confused by never hitting a breakpoint at the start of
the keyboard handler. Then I found https://sourceforge.net/p/bochs/discussion/39592/thread/5e397455
and started skipping one instruction in my breakpoint.

I still don't understand the discrepancy between some people installing
the handler at entry 9, and others installing at entry 0x21 = 33.

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