Google Groups no longer supports new Usenet posts or subscriptions. Historical content remains viewable.
Dismiss
Setting ST & VCP baud rate
18 views
Skip to first unread message
Mike Grimes
Dec 9, 2011, 9:56:05 AM12/9/11
to
I have an old 2550 up and running PRIMOS Rev 23 and it is being
donated to a local computer museum.
Using an ASCII terminal switching between ST & VCP modes caused no
problem. However, I attached a serial line to the VCP from a PC using
a USB RS-232 emulator and connected with HyperTerminal. In ST mode the
required COM setting is 9700,7,M,1. In CP mode the COM setting is
9700,7,S,1. HT will not communicate otherwise.
I know about ASRATE but how do I set parity?
donated to a local computer museum.
Using an ASCII terminal switching between ST & VCP modes caused no
problem. However, I attached a serial line to the VCP from a PC using
a USB RS-232 emulator and connected with HyperTerminal. In ST mode the
required COM setting is 9700,7,M,1. In CP mode the COM setting is
9700,7,S,1. HT will not communicate otherwise.
I know about ASRATE but how do I set parity?
Dennis Boone
Dec 9, 2011, 12:46:29 PM12/9/11
to
> I have an old 2550 up and running PRIMOS Rev 23 and it is being
> donated to a local computer museum.
Neat! Care to share provenance of the machine, where it's going, etc?
> donated to a local computer museum.
I looked back through the previous discussions of your machine,
and don't think you ever told us.
> Using an ASCII terminal switching between ST & VCP modes caused no
> problem. However, I attached a serial line to the VCP from a PC using
> a USB RS-232 emulator and connected with HyperTerminal. In ST mode the
> required COM setting is 9700,7,M,1. In CP mode the COM setting is
> 9700,7,S,1. HT will not communicate otherwise.
> I know about ASRATE but how do I set parity?
jumper on the VCP board that would let you set the VCP to mark parity,
but I don't have a 2550 service manual.
You're presumably running the dumb terminal 9600-7m1 and it's ignoring
parity, or 9600-8n1 and it's effectively ignoring the high eighth bit.
Some comm software will let you do much the same as your terminal is
doing, so you might look at other packages. I think old versions
of procomm may do this. HyperTerminal is ubiquitous, but it isn't
exactly the most featureful (or bug-free, in the version Microsoft
ships) thing.
De
Message has been deleted
Mike Grimes
Dec 9, 2011, 3:13:38 PM12/9/11
to
On Fri, 09 Dec 2011 11:46:29 -0600, d...@ihatespam.msu.edu (Dennis
Boone) wrote:
Hi, Mr. Boone.
>Neat! Care to share provenance of the machine, where it's going, etc?
The system is gone from my posession now. System Source, based in Hunt
Valley, MD, USA, took delivery today. There is a physical museum, but
their virtual museum is on the web at
http://syssrc.com/SYSSRC/html/museum. I assume someday you will be
able to view the 2550.
> > I know about ASRATE but how do I set parity?
>
>I don't think you can. I wonder if there might be a dip switch or
I have (er...had) many Prime docs but not one for the VCP board, that
I can remember.
>You're presumably running the dumb terminal 9600-7m1 and it's ignoring
PST 100 was running on the port, I forget the setting, but it slowly
dimmed to the point of uselessnes and might even be dead now.
>Some comm software will let you do much the same as your terminal is
I know HT's capabalites/shortcomings as well as others but HT worked
just fine. It was bug-free for what it was used, it was readily
available and it had the features needed.
I was hoping to fix the problem instead of work around it. Why the
mismatch: if the VCP is configured one way why should the ST want
different?
>
>De
Thanks for your response!
.
Boone) wrote:
Hi, Mr. Boone.
>Neat! Care to share provenance of the machine, where it's going, etc?
Valley, MD, USA, took delivery today. There is a physical museum, but
their virtual museum is on the web at
http://syssrc.com/SYSSRC/html/museum. I assume someday you will be
able to view the 2550.
> > I know about ASRATE but how do I set parity?
>
>I don't think you can. I wonder if there might be a dip switch or
I can remember.
>You're presumably running the dumb terminal 9600-7m1 and it's ignoring
dimmed to the point of uselessnes and might even be dead now.
>Some comm software will let you do much the same as your terminal is
just fine. It was bug-free for what it was used, it was readily
available and it had the features needed.
I was hoping to fix the problem instead of work around it. Why the
mismatch: if the VCP is configured one way why should the ST want
different?
>
>De
Thanks for your response!
.
Dennis Boone
Dec 11, 2011, 10:28:24 AM12/11/11
to
Mike,
Thanks for sharing.
> I have (er...had) many Prime docs but not one for the VCP board, that
> I can remember.
It would probably be in the 2550 manual your field engineer carried --
SMN270 (or TEAMAN270). Those weren't officially available to customers.
> PST 100 was running on the port, I forget the setting, but it slowly
> dimmed to the point of uselessnes and might even be dead now.
I'm fairly sure the PST100 ignored parity.
> I was hoping to fix the problem instead of work around it. Why the
> mismatch: if the VCP is configured one way why should the ST want
> different?
Does make you wonder. I don't think Z80 microcomputers traditionally
ran mark parity, but if you were custom developing one to go with your
minicomputer architecture that did run mark parity, why would you
deliberately change?
De
Thanks for sharing.
> I have (er...had) many Prime docs but not one for the VCP board, that
> I can remember.
SMN270 (or TEAMAN270). Those weren't officially available to customers.
> PST 100 was running on the port, I forget the setting, but it slowly
> dimmed to the point of uselessnes and might even be dead now.
> I was hoping to fix the problem instead of work around it. Why the
> mismatch: if the VCP is configured one way why should the ST want
> different?
ran mark parity, but if you were custom developing one to go with your
minicomputer architecture that did run mark parity, why would you
deliberately change?
De
0 new messages