>> This is good.  It will confuse the ROM selftest, but it appears I
>> should be able to connect a Sun keyboard with just a level shifter
>> and inverter, same as for a bog-standard serial port.
> DEC keyboard and mice (including tablet) accept reset and model
> inquiring command sequences.  You need to emulate them to go.

"Need to"?  The machine is willing to power up and boot (with serial
console for ROM interaction) with the keyboard and mouse disconnected;
I'd expect the same behaviour with "foreign" keyboard/mouse.  Perhaps
I'll try it, and if so I'll report back.

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