On 11/15/2019 8:09 PM, Fred Cisin via cctalk wrote:
What do the various Hayes modemS do when you type
"aT" ?
I can speak to all modems, as I gave away most of mine.
But the one I have right now has the following behavior:
AT -> OK
at -> OK
aT -> CR, no LF, essentially echoing back the CR
What do the various Hayes modemS do when you type
"aT" ?
What do they do when you used mixed case?
And, are they all the same? (as mentioned before, "Hayes Compatible" was
never completely defined.)
On 11/15/2019 5:18 PM, Chris Osborn via cctalk wrote:
On Nov 15, 2019, at 1:54 PM, alan--- via cctalk wrote:
MCU should set receive line coding to 8,N,1. When in command mode, you don't
care about parity
Actually it's in command mode that you *do* care about parity, which is why I
added
On 11/14/2019 9:17 AM, a...@alanlee.org wrote:
I think you may be over thinking this. I suppose a system could send
a bit-stream where the data bits + any parity bits != 8 or the parity
bit isn't in the trailing MSB position. However, for simplification
lets consider only that case. A
On Nov 15, 2019, at 1:54 PM, alan--- via cctalk wrote:
> MCU should set receive line coding to 8,N,1. When in command mode, you don't
> care about parity
Actually it's in command mode that you *do* care about parity, which is why I
added the parity detection in the first place. Without
On 11/15/2019 1:38 PM, Jim Brain wrote:
On 11/15/2019 3:12 AM, Brent Hilpert via cctalk wrote:
(If it is of any consequence at this point)
If those vertical groups of 4 are intended to correspond to the first
group of AT/at/At/aT, then you have the case bit (0x20) inverted,
uppercase are bit
Again.. I really think you are overthinking this.
MCU should set receive line coding to 8,N,1. When in command mode, you
don't care about parity as it is presumed the connection from the host
machine to the modem is short and largely has integrity. Every byte you
receive in 8,N,1 command
On 11/15/2019 3:12 AM, Brent Hilpert via cctalk wrote:
On 2019-Nov-14, at 10:23 PM, Jim Brain via cctalk wrote:
If you look at the values received by an 8N1 connection from a sender using the
different settings, you get:
AT
at
At
aT
7E1
E174
On Thu, 14 Nov 2019, Jim Brain via cctalk wrote:
While you're working in that code, would it be possible to derive the baud
rate of the host like the Smartmodem did? The modem would set the baud
rate on the first command sent to the modem. It would be kind of a neat
feature to have. :)
On 2019-Nov-14, at 10:23 PM, Jim Brain via cctalk wrote:
> If you look at the values received by an 8N1 connection from a sender using
> the different settings, you get:
>
> AT
> at
> At
> aT
> 7E1
> E174
> 41D4
> E1D4
> 4174
> 7O1
> 61F4
>
On 11/15/2019 12:37 AM, Jim Brain wrote:
Looks like there might be a few more corner cases as well. Maybe
modems did not accept mixed case. AT and at seem to work fine...
Anyone have a modem handy to check?
Spoiler alert... They do not. Only 'at' and 'AT' are recognized. So,
bit 5 of
Looks like there might be a few more corner cases as well. Maybe modems
did not accept mixed case. AT and at seem to work fine... Anyone have a
modem handy to check?
If you look at the values received by an 8N1 connection from a sender
using the different settings, you get:
AT
at
At
aT
7E1
E174
41D4
E1D4
4174
7O1
61F4
C154
6154
C1F4
7M1
E1F4
C1D4
On 2019-Nov-14, at 9:59 PM, Brent Hilpert via cctalk wrote:
> On 2019-Nov-14, at 9:30 PM, Jim Brain via cctalk wrote:
>> On 11/14/2019 11:05 PM, Brent Hilpert via cctalk wrote:
>>>
>>> (Without having gone through the code presented in full detail, but
>>> thinking from root premises.)
>>>
On 2019-Nov-14, at 9:30 PM, Jim Brain via cctalk wrote:
> On 11/14/2019 11:05 PM, Brent Hilpert via cctalk wrote:
>>
>> (Without having gone through the code presented in full detail, but thinking
>> from root premises.)
>>
>> ASCII A = 0x41 --> 2 bits on
>> ASCII T = 0x54 --> 3 bits on
>
> I
On Thu, Nov 14, 2019, 10:30 PM Jim Brain via cctalk
wrote:
> On 11/14/2019 11:05 PM, Brent Hilpert via cctalk wrote:
> >
> > (Without having gone through the code presented in full detail, but
> thinking from root premises.)
> >
> > ASCII A = 0x41 --> 2 bits on
> > ASCII T = 0x54 --> 3 bits on
>
On 11/14/2019 11:05 PM, Brent Hilpert via cctalk wrote:
(Without having gone through the code presented in full detail, but thinking
from root premises.)
ASCII A = 0x41 --> 2 bits on
ASCII T = 0x54 --> 3 bits on
I agree, though I believe aT,At,AT,and at are all allowed, which
complicates
On 2019-Nov-14, at 6:48 PM, Jim Brain via cctalk wrote:
> Well, I am off and running on getting my version of the code up to speed:
>
> https://github.com/go4retro/tcpser
>
> Man, some of this code is rough. I have learned a lot about writing C code
> in the last decade+.
>
> Anyway, while I
Well, I am off and running on getting my version of the code up to speed:
https://github.com/go4retro/tcpser
Man, some of this code is rough. I have learned a lot about writing C
code in the last decade+.
Anyway, while I work on adding the appropriate functionality into the
codebase, I
Date: 11/14/19 10:41 AM (GMT-06:00) To:
cctalk@classiccmp.org Subject: Re: Question about modems On 11/14/19 7:41 AM,
Jim MacKenzie via cctalk wrote:> I have a ham radio callsign too (VE5EV) and
one of these years I intend > to really experiment with packet radio, and
eventually, AX
On 11/14/19 7:41 AM, Jim MacKenzie via cctalk wrote:
I have a ham radio callsign too (VE5EV) and one of these years I intend
to really experiment with packet radio, and eventually, AX25 TCP/IP
networking over radio using packet modems.
I'm also interested in packet. I keep poking friends &
I think you may be over thinking this. I suppose a system could send a
bit-stream where the data bits + any parity bits != 8 or the parity bit
isn't in the trailing MSB position. However, for simplification lets
consider only that case. A modem will always set the local line coding
to
On 2019-11-13 09:17, geneb via cctalk wrote:
Jim, I'd try reaching out to Dale Heatherington...
Dale generally keeps to himself and rarely talks shop outside of the
context of telecommunication discussions - which he also avoids. I've
asked him if he would like to speak at VCF-SE a couple
-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Fred Cisin
via cctalk
Sent: Wednesday, November 13, 2019 7:08 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: RE: Question about modems
>What do you need to do to use an acoustic mo
-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of allison via
cctalk
Sent: Wednesday, November 13, 2019 6:02 PM
To: cctalk@classiccmp.org
Subject: Re: Question about modems
> Like RS232/432 signaling the art and science is getting lost to t
On Nov 13, 2019, at 5:07 PM, Fred Cisin via cctalk
wrote:
> What do you need to do to use an acoustic modem with a cellphone?
> You can get a "retro" handset for a cellphone, that will fit the rubber cups,
> but, will it work?
Yes.
https://www.youtube.com/watch?v=uQqWHLZjOjA
--
Follow me on
On 2019-Nov-13, at 5:22 PM, Electronics Plus via cctalk wrote:
> ... I can simply connect 2 modems to each
> other via a POTS phone cable, attach each modem via serial cable to a
> different laptop, and set one to Listen and the other to Answer via
> HyperTerminal.
This will work for some modems,
On 11/13/19 5:25 PM, Electronics Plus via cctalk wrote:
And here my problem is that I have the old modems, but I can't test
them because I no longer have a land line.
~chuckle~
Is there any way to test an internal or external modem without anything
except broadband or cellular connections?
A "telephone line simulator".
On Wed, 13 Nov 2019, Electronics Plus wrote:
A young gent (about 22 yrs old) reminded me of HyperTerminal on XP. Since I
have stacks of old working XP laptops, I can simply connect 2 modems to each
other via a POTS phone cable, attach each modem via serial cable
-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Fred Cisin
via cctalk
Sent: Wednesday, November 13, 2019 7:08 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: RE: Question about modems
On Wed, 13 Nov 2019, Electronics Plus via cctalk
On Wed, 13 Nov 2019, Electronics Plus via cctalk wrote:
And here my problem is that I have the old modems, but I can't test them
because I no longer have a land line. Is there any way to test an
internal or external modem without anything except broadband or cellular
connections? I know I
The case presented is an true corner case. Usually modems can be set
for rate, bits, and parity that matches the target system. AS modem
became more sophisticated (26/33/56k) they were easily set and I just a
few I have. Older 300/1200/2400 baud modems like DEC DF02/03 had
switch settings
On 11/13/2019 3:41 PM, Nigel Johnson via cctalk wrote:
No. While each end might be able to communicate with the local modem
in command mode using different parameters, when they are in connected
mode the modems will not convert anything, just pass the exact format
along. So if one end is
On 11/13/19 4:16 PM, Grant Taylor via cctalk wrote:
> On 11/13/19 1:31 PM, Fred Cisin via cctalk wrote:
>> But, stuff like commands to the modem didn't need much of that, and
>> needed to be able to communicate in spite of wrong parameters. It
>> made sense for a modem to recognize a command,
On 11/13/19 2:41 PM, Nigel Johnson via cctalk wrote:
No. While each end might be able to communicate with the local modem in
command mode using different parameters, when they are in connected mode
the modems will not convert anything, just pass the exact format along.
So if one end is
No. While each end might be able to communicate with the local modem in
command mode using different parameters, when they are in connected mode
the modems will not convert anything, just pass the exact format along.
So if one end is expecting 7E2 and the other is sending 8N1 there will
be a
On 11/13/19 1:31 PM, Fred Cisin via cctalk wrote:
But, stuff like commands to the modem didn't need much of that, and
needed to be able to communicate in spite of wrong parameters. It made
sense for a modem to recognize a command, even with wrong parity, etc.
Okay
Now I'm thinking that
On Wed, 13 Nov 2019, Grant Taylor via cctalk wrote:
Are you sure that the parity stripping (for lack of a better description) was
meant to translate things between modems? I would speculate that it was to
transition from serial communications which inherently depend on those
settings to TCP
The following is based on my limited understanding. I could easily be
wrong. Please correct me if I am.
On 11/13/19 12:25 AM, Jim Brain via cctalk wrote:
Some time ago, Chris Osborn (FozzTexx) forked a copy of my project to
fix some bugs and he also added in some parity code, which looks to
And, more than one different model!
A bunch of yuears ago, Joe Campbell ("C Programmer's Guide To Serialo
Communication", "RS232 Solution", etc, NOT the PBS Joe Campbell) told me
that he was doing some consulting for Hayes, about setting up the standard
for "Hayes Compatible"; it seemed that
On Nov 13, 2019, at 10:41, Nigel Johnson wrote:
>
>
> On 13/11/2019 13:36, Chuck Guzis via cctalk wrote:
>> There are other "oddball" combinations, such as 8E1 and 8O1, which sends
>> a 9-bit data frame. You can see datasheets on some UARTs as well as MCU
>> UARTs that support the 9 bit packet.
On 11/13/19 10:41 AM, Nigel Johnson via cctalk wrote:
>
> On 13/11/2019 13:36, Chuck Guzis via cctalk wrote:
>> There are other "oddball" combinations, such as 8E1 and 8O1, which sends
>> a 9-bit data frame. You can see datasheets on some UARTs as well as MCU
>> UARTs that support the 9 bit
On 13/11/2019 13:36, Chuck Guzis via cctalk wrote:
There are other "oddball" combinations, such as 8E1 and 8O1, which sends
a 9-bit data frame. You can see datasheets on some UARTs as well as MCU
UARTs that support the 9 bit packet.
According to the diagram of the Smartmodem there is no UART,
There are other "oddball" combinations, such as 8E1 and 8O1, which sends
a 9-bit data frame. You can see datasheets on some UARTs as well as MCU
UARTs that support the 9 bit packet.
Also, don't/doesn't TDD (5 level code) use 5E2 or some such. Same for
Telex/TWX.
--Chuck
Not much in the manual. I browsed it looking for anything about data
bits and stop bits. Nothing.
p1-2: ' Commands given to the Smartmodem must be ASCII coded at baud
rates between 110 baud and 1200 baud. Once 'on-line', any code at any
speed from 0 to 300 baud may be used.'
p 9-1 'Do not
On Nov 13, 2019, at 6:40, allison wrote:
>
> On 11/13/19 9:17 AM, geneb via cctalk wrote:
>> On Wed, 13 Nov 2019, Jim Brain via cctalk wrote:
>>
>>> Did Hayes modem really do that? I thought most later modems self
>>> detected parity and speed and thus would have switched both the comm
>>> on
On Nov 13, 2019, at 11:17 AM, Jim Brain via cctalk
wrote:
> On 11/13/2019 7:47 AM, Alexandre Souza via cctalk wrote:
>> Jim, its a long time I don't use it, but I've used other configurations
>> beyond 8N1 and I remember when you put the modem in 7E1 it mirrored the
>> configuration of the
On 11/13/2019 5:31 AM, Nigel Johnson via cctalk wrote:
I actually have an original Hayes 300 modem. Would it be any use if I
could set it up for a a test, or would it need another genuine Hayes
one to talk to for what you need?
I looked at the SmartModem 300. It looks like it completely
On 11/13/2019 7:47 AM, Alexandre Souza via cctalk wrote:
Jim, its a long time I don't use it, but I've used other
configurations beyond 8N1 and I remember when you put the modem in 7E1
it mirrored the configuration of the other side. If you had a vax with
a 2400 7E1 port, you gotta have in the
On 11/13/19 9:17 AM, geneb via cctalk wrote:
> On Wed, 13 Nov 2019, Jim Brain via cctalk wrote:
>
>> Did Hayes modem really do that? I thought most later modems self
>> detected parity and speed and thus would have switched both the comm
>> on the serial port and the data sent to the other side
On Wed, 13 Nov 2019, Jim Brain via cctalk wrote:
Did Hayes modem really do that? I thought most later modems self detected
parity and speed and thus would have switched both the comm on the serial
port and the data sent to the other side in the same parity (if the terminal
was 7E1, the modem
Jim, its a long time I don't use it, but I've used other configurations
beyond 8N1 and I remember when you put the modem in 7E1 it mirrored the
configuration of the other side. If you had a vax with a 2400 7E1 port,
you gotta have in the terminal 2400 7E1
So, you gotta match the configuration
I actually have an original Hayes 300 modem. Would it be any use if I
could set it up for a a test, or would it need another genuine Hayes one
to talk to for what you need?
cheers,
Nigel
On 13/11/2019 02:25, Jim Brain via cctalk wrote:
I am the author of tcpser, a UNIX/Windows program that
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