At 10:47 PM 3/28/97, Dan Jacobowitz wrote:
>On Fri, 28 Mar 1997, Henry B. Hotz wrote:
>
>> At 6:27 PM 3/28/97, Dan Jacobowitz wrote:
>> >On Fri, 28 Mar 1997, Bill Studenmund wrote:
>> >
>> >> > BTW I have another question.  To boot 'headless' requires shorting out
>> >> > pins 4 and 11 in the monitor port....but will a monitor still work
>>after I
>> >> > short them out if I need to use one at some point?
>> >>
>> >> ?? Yes. All that shorting does is fake the computer into thinking there's
>> >> a certain type of monitor connected. If you later connect that type of
>> >> monitor, all is well. It's not good if you try to attach a different
>> >> type of monitor. :-(
>> >>
>> >The problem here is, what kind of monitor does it think?  I have a NEC VGA
>> >connected to a VGA-Mac adapter....will this work?  And All I have to do to
>> >short it out is to stick a paperclip into those two holes and turn the
>> >machine on, right?
>>
>> Actually you are already all set.  The VGA/Mac adapter does the shorting
>> for you.  Just unplug the monitor and leave the adapter in place.
>>
>Hmmm.  I would still like an answer to the question...I am _unbelievably_
>broke right now.  Just bought the other Mac in my LAN (7300/200).
>I truly can't afford the $20 for an adapter.

I guess you are saying the other place the monitor lives is also a Mac.  Pity.

>Alas for the plight of starving high school students.

Been there, done that.  (But not for quite a while.)

>Is there a chance I could modify the kernel sources to simply not check
>for a monitor?  I considered leaving serial console spouting off into an

I'm with Bill Studenmund on this one.  The kernel probably won't like the
changes.  I assume you can afford the cost of a paperclip, even if the $20
adapter is too much.  You can find out what the sense pins are from the
Apple web site.

Note that there are at least two revisions of the definitions.  The
original just looked at what pins were shorted to each other or ground.
The current revision allows you to use diodes as well as wire so there are
*lots* more possabilities, including various flavors of multisync monitors.

Hey, here's a thought:  Borrow a multimeter and scope out how the adapter
on your NEC monitor is set right now!

Good luck.

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