baud rate of a virtual terminal

[seasoned_geek]

All,

A bit of a theoretical question.

Does setting the baud rate on a virtual terminal actually do anything other than change the value in SHOW TERM/FULL?

This question came up recently and I never really thought about it before. Does the terminal device driver create a virtual UART for the virtual terminal, throttling its throughput to the BAUD rate or does it create an in memory stream which simply does a memory to memory transfer as fast as possible?

I suppose, only one familiar with the driver code itself could answer this. My gut tells me that value should just be for show.

I'm not talking about a LAT port or anything like that. I'm talking about a virtual terminal created on an Alpha being written to by other processes on the same Alpha.

Thanks,

[George Cornelius]

In article <8128647b-7bf2-4daa...@googlegroups.com>, seasoned_geek <rol...@logikalsolutions.com> writes:
> All,
>
> A bit of a theoretical question.
>

> Does setting the baud rate on a virtual terminal actually do anything other=

> than change the value in SHOW TERM/FULL?

No.

I will comment that in the X.25 days if you ran VAX PSI and connected via
an X.29 (NVAxx?) terminal session to Compuserve, it would trust the value
it was supplied - yes, the pseudoterm passed the settings on via X.29
parameters - and then use that, as with any other serial port dialup,
to determine the rate you were charged.

At $22/hr for 9600 bps dialup, it's not surprising that some might be
tempted to drop their declared DECterm speeds via SET TERM commands.

George

> This question came up recently and I never really thought about it before. =
> Does the terminal device driver create a virtual UART for the virtual termi=
> nal, throttling its throughput to the BAUD rate or does it create an in mem=
> ory stream which simply does a memory to memory transfer as fast as possibl=
> e?
>
> I suppose, only one familiar with the driver code itself could answer this.=

> My gut tells me that value should just be for show.
>

> I'm not talking about a LAT port or anything like that. I'm talking about a=
> virtual terminal created on an Alpha being written to by other processes o=
> n the same Alpha.

[Robert A. Brooks]

On 4/18/2018 1:44 AM, George Cornelius wrote:
> seasoned_geek <rol...@logikalsolutions.com> writes:
>> All,
>>
>> A bit of a theoretical question.
>>
>> Does setting the baud rate on a virtual terminal actually do anything other=
>> than change the value in SHOW TERM/FULL?
>
> No.
>
> I will comment that in the X.25 days if you ran VAX PSI and connected via
> an X.29 (NVAxx?) terminal session to Compuserve, it would trust the value
> it was supplied - yes, the pseudoterm passed the settings on via X.29
> parameters - and then use that, as with any other serial port dialup,
> to determine the rate you were charged.

Ah, yes, the CCITT (now ITU-T) X.3 parameters.

At this moment, I'm looking at my "Blue Book" from 1989 that contains
recommentations X.1 through X.32 as I put the finishing touches on the VSI
rebuild of the X.25 suite.

--
-- Rob

[Simon Clubley]

On 2018-04-18, Robert A. Brooks <FIRST...@vmssoftware.com> wrote:
>
> At this moment, I'm looking at my "Blue Book" from 1989 that contains
> recommentations X.1 through X.32 as I put the finishing touches on the VSI
> rebuild of the X.25 suite.
>

Interesting. How much of a demand is there for X.25 these days ?

Simon.

--
Simon Clubley, clubley@remove_me.eisner.decus.org-Earth.UFP
Microsoft: Bringing you 1980s technology to a 21st century world

[Bill Gunshannon]

On 04/18/2018 02:24 PM, Simon Clubley wrote:
> On 2018-04-18, Robert A. Brooks <FIRST...@vmssoftware.com> wrote:
>>
>> At this moment, I'm looking at my "Blue Book" from 1989 that contains
>> recommentations X.1 through X.32 as I put the finishing touches on the VSI
>> rebuild of the X.25 suite.
>>
>
> Interesting. How much of a demand is there for X.25 these days ?
>

I wondered that, too, but didn't ask out of fear of being named
a troll again.

bill

[Scott Dorsey]

Banks still like X.25, although usually it's X.25 tunnelled over IP these
days. I wouldn't be surprised if you could count the number of X.25 customers
on one hand, but I also wouldn't be surprised if they were the most lucrative
customers out there.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

[seasoned_geek]

On Wednesday, April 18, 2018 at 12:49:32 AM UTC-5, George Cornelius wrote:
>
> At $22/hr for 9600 bps dialup, it's not surprising that some might be
> tempted to drop their declared DECterm speeds via SET TERM commands.

You were getting a discount at $22/hr. I had to use Golden Compass under OS/2 as a front end so I could read/write email and user groups off-line so I wouldn't have to sell my car to cover the Comp-U-Serve bill.

People would only download stupid cat videos during the first month. After that their phone was disconnected and house put up for auction.

[Hans Bachner]

Simon Clubley schrieb am 18.04.2018 um 20:24:
> On 2018-04-18, Robert A. Brooks <FIRST...@vmssoftware.com> wrote:
>>
>> At this moment, I'm looking at my "Blue Book" from 1989 that contains
>> recommentations X.1 through X.32 as I put the finishing touches on the VSI
>> rebuild of the X.25 suite.
>
> Interesting. How much of a demand is there for X.25 these days ?

X.25 is still in use for dedicated secure mail systems here in Austria.

Hans.