[Rack] doorport - do you know how the door opener works?

[Jake]

Who knows how the door opener script works?  The door opener circuitboard 
is now effectively plugged into Minotaur, the computer screwed to the wall 
over the "server room" door.  Make it work somehow.

https://www.noisebridge.net/wiki/Doorport

This page is here to store information about the parallel port / door 
opener thingy that allows noisebridgers to open the door from a computer.

jake (spaz) made a 30 foot (approximately) cable which has a female 
centronics-36 socket (like on an old printer) on one end, and a female 
DB-25 socket on the other end. It is a cat5 wire which has eight 
conductors, and is passing through two ground wires (to pins 19 and 20 on 
the DB25) and three each of input and output pins. These include pins 6 
and 7 (bits 4 and 5 of the parallel data byte), and pin 16 (an output pin 
which is pin 31 on the centronics connector). The three input pins are 10, 
12 and 13 (none of which are inverted in the implementation). Pins 6 and 
10 are the only ones wired up right now on the little optoisolator board 
(along with ground on pin 20).

This is plugged into a USB parallel port cable (made for using old 
printers) which is plugged into Minotaur, the computer screwed to the wall 
over the "server room" door.

the other end is in the dirty shop and is plugged into the little 
circuitboard with optoisolators on it, which is for opening the door. That 
board also has a male PS2 keyboard connector for 5v power, but that should 
be changed to connect to pin 7 of the DB25 port for power. The software 
will have to make sure to always turn pin 7 to logical 1, so that power is 
available to the little board for whatever that does.. probably a pull-up 
for a signal coming into the parallel port.

If you know anything about that little board and what it does (or is 
supposed to do) please put that information here. Also please put the C 
program or whatever it is that talks to the parallel port and opens the 
door.