DL11 configuration for pdp11gui

Fritz Mueller fritzm at fritzm.org
Mon Jun 27 03:14:58 CDT 2016

Okay, so I scoped the serial line, and the EIA line drivers seemed to be 
acting funny, mark voltage was way to high, etc.  So checked power, and 
looks like I have a -15V distribution issue to the SPC slots on my 
backplane.  Moved the DL11 over to my DD11 expansion where I already 
debugged -15V to get MOS memory working and then everything was fine...

Somehow the VT52 could still make sense out of the wacky transmit 
voltages, but my MacBook certainly could not.  Anyway, after this I was 
able to run pdp11gui under wine on the MacBook and successfully connect 
to and interact with the 11/45.


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