Paul Koning paulkoning at comcast.net
Thu Jun 2 13:40:11 CDT 2016

> On Jun 2, 2016, at 2:19 PM, Noel Chiappa <jnc at mercury.lcs.mit.edu> wrote:
>> ...
>> For whatever reason they managed to disable the unibus  I/O
> I'm not sure you can (in hardware terms, that is - and clearly if there's no
> way to do it in the hardware, the software cannot do so)... although it could
> be broken.

I could imagine any number of signals that, if stuck, would make the bus inoperative.  Reset asserted, for example.  Or AC LO or DC LO asserted, possibly.  Or NPG asserted.


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