Re: 4400/200: next issue!

["William J. Coldwell" <cryo%cryo.ws@localhost>]

Rs-422 I think, not rs 232

Sent from my iPhone

> On Sep 6, 2021, at 4:35 PM, Mouse <mouse%rodents-montreal.org@localhost> wrote:
> 
> Okay, thanks to everyone who helped, I have my 4400/200 powering up
> now.
> 
> Next problem: having trouble finding the relevant serial port - if
> there is such a thing.  I found references saying that for serial
> console I want the modem port, which is fine, BUT...
> 
> ...I can't seem to find the relevant pins.
> 
> The connector looks like the miniDIN-8 I'm used to from SPARCStations,
> only with a 9th pin.  I found a Sun cable that brought the 8 pins it
> supports out to a DB-25.  Pin 7 - the usual ground pin - shows a
> sub-1-ohm connection to circuit ground, so I figured I should be able
> to find the data pins by looking for pins driven by the machine.
> 
> Trouble is, I was able to find only two such, and neither of them gives
> me data on power-up.
> 
> I then tried the other port - the one marked with a printer icon
> instead of a phone handset icon - and got just as much nothing.
> 
> Of course, the dead battery means any settings will have been lost.
> Does this mean that I shouldn't expect anything on the serial ports
> upon powering up with neither keyboard nor monitor connected?  I don't
> know where my ADB keyboards are, nor any Mac monitors (I used to have
> one, not sure whether I still do).  Is it possible to drive a VGA
> monitor off the Mac DA-15 video with a passive adapter?  If so, where
> would I find the pinouts?  I could solder one up, and, even if it
> doesn't work perfectly, it might work well enough for me to change
> settings.
> 
> Of course, I'd then still need to find an ADB keyboard.  I'm pretty
> sure I still have one, just not sure where it might be.
> 
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