Yeah. Looks like the unworldly SCSI a cables bent bus pins though. Didn't notice until a bit later.
Pulling backplane for inspection
Sent from my iPhone
On Feb 12, 2015, at 14:37, Jim Carpenter <jim at deitygraveyard.com> wrote:
On Feb 12, 2015 2:27 PM, "Cory Smelosky" <b4 at gewt.net> wrote: > > I moved the PSU, re plugged it in as is...and now I can press return. >
So serial is working completely correctly now?
On 02/12/2015 06:43 PM, Johnny Billquist wrote:
Sorry. It's just that sometimes my patience runs thin. And the video just shows someone who is trying totally random things without giving me any impression he knows at all what he is doing.
Sorry for wearing you out :D
I'm probably just expecting things at a level you don't see anymore.
nope, serial is to low level :)
/P
On Feb 12, 2015, at 11:37 AM, Jim Carpenter <jim at deitygraveyard.com> wrote:
On Feb 12, 2015 2:27 PM, "Cory Smelosky" <b4 at gewt.net> wrote: > > I moved the PSU, re plugged it in as is...and now I can press return. >
So serial is working completely correctly now?
Data ground path routed through a poorly-plugged-in power supply? Definitely a ground problem somewhere!
Ian
On Feb 12, 2015 2:27 PM, "Cory Smelosky" <b4 at gewt.net> wrote: > > I moved the PSU, re plugged it in as is...and now I can press return. >
So serial is working completely correctly now?
I moved the PSU, re plugged it in as is...and now I can press return.
It's telling me my memory config is bad now though.
Sent from my iPhone
On Feb 12, 2015, at 14:17, Johnny Billquist <bqt at softjar.se> wrote:
On 2015-02-12 20:12, Cory Smelosky wrote:
Sent from my iPhone
On Feb 12, 2015, at 14:09, Peter Lothberg <roll at Stupi.SE> wrote:
Depending on config of the system chasseie ground and signal ground
might be isolated.
The only ground connected is shield ground. ;)
That is just plain wrong.
If there is a "klinik" (another DB25 port, or if it has DB25's for
user terminals (check if there is a board connected on the able)
measure from pin 7 to pin 7 in another connector.
Pin 7 is NCL on all the serial breakouts I have.
Huh? Pin 7 on a DB25 RS-232 is signal ground. It is one of the three pints you actually need. The other two being pin 2&3. No other pin is required, but 2,3,7 are the ones *absolutely* required.
And for a null modem cable, you connect:
2-3
3-2
7-7
Johnny
On 2015-02-12 20:12, Cory Smelosky wrote:
Sent from my iPhone
On Feb 12, 2015, at 14:09, Peter Lothberg <roll at Stupi.SE> wrote:
Depending on config of the system chasseie ground and signal ground
might be isolated.
The only ground connected is shield ground. ;)
That is just plain wrong.
If there is a "klinik" (another DB25 port, or if it has DB25's for
user terminals (check if there is a board connected on the able)
measure from pin 7 to pin 7 in another connector.
Pin 7 is NCL on all the serial breakouts I have.
Huh? Pin 7 on a DB25 RS-232 is signal ground. It is one of the three pints you actually need. The other two being pin 2&3. No other pin is required, but 2,3,7 are the ones *absolutely* required.
And for a null modem cable, you connect:
2-3
3-2
7-7
Johnny
Sent from my iPhone
On Feb 12, 2015, at 14:09, Peter Lothberg <roll at Stupi.SE> wrote:
Should I grab the iron and change pin 1 to 7?
I suggest you find out what's wrong and fix it the way it's supposed
to be..
That'd require schematics ;)
Depending on config of the system chasseie ground and signal ground
might be isolated.
The only ground connected is shield ground. ;)
If there is a "klinik" (another DB25 port, or if it has DB25's for
user terminals (check if there is a board connected on the able)
measure from pin 7 to pin 7 in another connector.
Pin 7 is NCL on all the serial breakouts I have.
My guess is that someone has "fried" the console ground wire with
current, and you should be lucky more stuff is not dead. -:)
Possible ;)
-_P
$ show sys
OpenVMS V8.3 on node CODA 12-FEB-2015 11:08:30.67 Uptime 0 00:11:00
....
$ WRITE SYS$OUTPUT F$MESSAGE (2928)
%SYSTEM-W-FISH, my hovercraft is full of eels
$
Looks like Fred is right!
Bob
Should I grab the iron and change pin 1 to 7?
I suggest you find out what's wrong and fix it the way it's supposed
to be..
Depending on config of the system chasseie ground and signal ground
might be isolated.
If there is a "klinik" (another DB25 port, or if it has DB25's for
user terminals (check if there is a board connected on the able)
measure from pin 7 to pin 7 in another connector.
My guess is that someone has "fried" the console ground wire with
current, and you should be lucky more stuff is not dead. -:)
-_P
On 2015-02-12 19:23, Cory Smelosky wrote:
None of the pins on the connector are ground. That'd explain some things.
I just want to check here, how you asserted that? The signal ground is not the same as chassis ground, so I hope you didn't just measure against some random point on a chassis, or some random pin on a DB25...
Johnny
Sent from my iPhone
On Feb 12, 2015, at 13:22, Peter Lothberg <roll at Stupi.SE> wrote:
Straight gives me gibberish, null gives me output. I'll find my straight.
FWIW, if the SC40 is wired like a "real" DEC computer, then a null modem
cable would be required between the console DB25 and a VTxxx.
If the wiring (ground) was even close to correct, either crossed or non
crossed should give NO characters. -:)
--P
