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
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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
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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
Okay!
Should I grab the iron and change pin 1 to 7?
Signal ground is currently floating
Sent from my iPhone
On Feb 12, 2015, at 13:59, Peter Lothberg <roll at Stupi.SE> wrote:
Cory,
When you have sorted out the console thing, do:
NSP>show cpu assIGNMENT
CPU0 has the following channels assigned:
No IU channels
RH channels:
LOGICAL ACTUAL TYPE MISCELLANEOUS
5 CHN1 EI
0 CHN0 SI MASK=0x03
1 CHN2 SI MASK=0x03
7 CHN3 CI PORT#=0x3
DTEs:
LOGICAL ACTUAL TYPE MISCELLANEOUS
0 FE PRIVILEGED
and
NSP>dir
-P
Cory,
When you have sorted out the console thing, do:
NSP>show cpu assIGNMENT
CPU0 has the following channels assigned:
No IU channels
RH channels:
LOGICAL ACTUAL TYPE MISCELLANEOUS
5 CHN1 EI
0 CHN0 SI MASK=0x03
1 CHN2 SI MASK=0x03
7 CHN3 CI PORT#=0x3
DTEs:
LOGICAL ACTUAL TYPE MISCELLANEOUS
0 FE PRIVILEGED
and
NSP>dir
-P
Twisted cable...sorry. Pin far left with cable mated, looking at the mate is ground.
Sent from my iPhone
On Feb 12, 2015, at 13:23, Cory Smelosky <b4 at gewt.net> wrote:
None of the pins on the connector are ground. That'd explain some things.
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
