Re: DECstation 2100: power trouble?

>> Is it known what it takes to fake keyboard and/or mouse presence?
> From 30-year-old notes:

For a 30-plus-year-old machine, that's fair :-)

> The loopback connector part number is: 12-25628-01.  To make one:

> Short Transmit data to Receive Data,        o 1
> pins 2->4 as shown in the diagram.    7  o +-+  o 2
> (view looking at the plug).           6  o | |
>                                        5  o +-+  o 3
>                                              o 4

I suspect this is the jumper I found in the connector, the one I never
got any output until I removed.

I installed such a jumper.  I had to reset the machine a few times
(and/or let it sit powered on; I did both, but don't know what is
responsible for it working), but eventually the LEDs went to 7f instead
of ef; it then POSTed successfully:

KN01 V7.0 

7..6..5..4..3..2..1..0

24Mb..........0

KN01 V7.0 
08-00-2b-14-8c-7e
0x01800000

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It now netboots into some NetBSD/pmax, whatever I had in my leftover
netboot setup.

I don't know why I didn't succeed before.  I must have not done
whatever magic sequence got it past getting stuck at ef before.

This is very encouraging!  It's a bit finicky to get started, but once
it works it seems to actually work.

Thank you very much, both of you!

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