I've done this several different ways in the past, depending on your take of
"Cell phone".
For the phone that is probably in your pocket right now I've used one of
those bluetooth bridges that looks like a bluetooth handsfree device to the
phone but on your side you get a 48/90v POTS RJ11 for a regular phone. You
can attach a modem to them but some of those adapters do not emit a dial
tone.
These older adapters have major problems regarding audio quality and noise
cancellation. I could not relaibly make it hold a connection above 300bps.
Even 110bps had spurious corruption from time to time so barely enough for a
teletype connection and over an acoustic coupler it was not a lot better by
using one of those hipster handsets that plugged into the headphone jack on
phones, when a headphone jack was still a thing......That feels weird to
even say.
I do have a data kit for motorola's line of bag and car phones but that
requires the discontinued AMPS service. Same goes for the data kit for my
Tandy rebranded Nokia portable telephone which has basically an audio
breakout so you can attach an acoustic coupler. Radio Shack's catalog made
this adapter seem WAY cooler than it really was but I guess if you were
high-rollin' with a Tandy portable that was one way to dial into the office.
On the other hand I've also done data calls over an MSAT phone. A Mitsubishi
OmniQuest ST251 if you plug a terminal into the serial port responds to
hayes AT commands and emulates a 1200bps modem but the cal was very, very
expensive as it switches the radio specifically into a data-only mode.
If we're talking satellite phones that fot in your pocket I've logged into
Slashnet over a Globalstar GSP-1600 while camping which also appears as a
Hayes modem but under Windows you get an extra-special modem definition
driver that lets you engage speeds up to a blazing fast 9600bps.
-John
>Date: Wed, 10 Aug 2022 23:53:34 -0600
>From: Grant Taylor <cctalk(a)gtaylor.tnetconsulting.net>
>Subject: [cctalk] Cell phone as a dial up modem.
>To: cctalk <cctalk(a)classiccmp.org>
>Message-ID:
> <9cdbf98f-21ff-77f9-2676-2f5e73370913(a)spamtrap.tnetconsulting.net>
>Content-Type: text/plain; charset=utf-8; format=flowed
>
>Does anyone know if it's possible, or -- better -- have experience using
>a cell phone as a dial up modem?
>
>I'm wondering about doing something as an alternative to a traditional
>POTS modem connected to a VoIP ATA. I'd think that treating the phone
>as a traditional modem with venerable Hayes AT commands might be more
>reliable than trying to do dial up connections across VoIP.
>
>It's been *YEARS* since I've tried to connect a modem to a serial port
>on a PC, universal or otherwise.
>
>Does anyone have any experience with or thoughts about doing this?
>
>--
>Grant. . . .
>unix || die
45 years for the TRS-80. My! Where has the time gone? The “Trash-80” was
one of the earliest micro-computers in my home. Radio Shack helped create
the ‘PC’ industry, the consumer version anyways, fueling what is now our
hobby.
Happy computing.
Murray 🙂
Replying to myself...Read manual...terminal does not talk to modems at
2400b, had to step down to 300b, worked.
On Fri, Aug 12, 2022, 2:25 PM Bill Degnan <billdegnan(a)gmail.com> wrote:
> I have an old terminal without a CTS line. If I hook up my laptop running
> Teraterm 2400,7N1 to the terminal and use a null modem cable I can type
> characters in the laptop and they appear on the terminal and if I type
> characters in the terminal they appear on the laptop.
>
> If I attach an ESP82660 WIfi modem to the laptop running teraterm I can
> connect, etc to use the WIFI - i.e. connect to a telnet service (ATDT
> bbs.fozztexx.com or towel.blinkenlights.nl).
>
> If I attach the same ESP82660 to the terminal, the ESP transmits to the
> terminal fine (to show the initial connection screen) but I when I type
> characters (such as ATZ) they do not appear on the display and I thus
> believe do not transmit, thus no echo back from the ESP. SO, there is
> something in the config of the ESP that is not happy. I have the terminal
> and laptop set for 2400,7N1.
>
> The pins of the terminal are
> 1 - ground
> 2 - transmitted data
> 3. - receive data
> 4 - rts
> 7 signal ground
> 8 data carrier detector
> 11 reverse channel transmit data
> 12 reverse channel receive data
> 18 read only data
> 20 data terminal ready.
>
> I am working on this, but any tips would be appreciated. Do I need Mark
> or Space parity?
>
> Bill
>
Does anyone know if it's possible, or -- better -- have experience using
a cell phone as a dial up modem?
I'm wondering about doing something as an alternative to a traditional
POTS modem connected to a VoIP ATA. I'd think that treating the phone
as a traditional modem with venerable Hayes AT commands might be more
reliable than trying to do dial up connections across VoIP.
It's been *YEARS* since I've tried to connect a modem to a serial port
on a PC, universal or otherwise.
Does anyone have any experience with or thoughts about doing this?
--
Grant. . . .
unix || die
I have a recently recapped SE/30, and I have installed a SCSI2SD (v5.0a) inside it. I don't have a (working) CD drive, and the floppy drive is broken, so I configured SCSI device 3 to be a CD-ROM drive, and put the System 7.5.3 installer inside it, along with a copy of the patched "HD SC Setup" utility, so I can format the other SCSI devices, which are configured as 2GB hard disks.
Booting from the "CD" works fine. Formatting the disks works fine.
I cannot get the System 7.5.3 installer to complete. After copying a few files, it complains that an error occurred, and then aborts.
Additionally, if I attempt to copy the contents of the "CD" to a hard disk, after copying a few files, I get an error that says a "disk error" occurred. It's not the same file every time, it copies a random number of files successfully before erroring.
I've have also had a few random bomb errors, although these do not happen reliably and I haven't managed to come up with a way of causing them on demand. They may have stopped after I swapped the RAM, although that is speculation.
Things that I have tried:
* Playing with the "SCSI Host", "SCSI Selection Delay", "Enable Parity", "Respond to short SCSI selection pulses" settings on the SCSI2SD. No combination seems to make any noticeable difference.
* Swapping out the RAM on the SE/30. I initially thought the RAM was bad, but I replaced it with a different set and the symptoms are exactly the same.
* Removing the case back, in case something was overheating inside.
* Replacing the microSD card with a different one.
None of these have altered the symptoms at all, and I'm running out of ideas. Any suggestions would be very welcome.
David
Hello,
I have many rl02 disk packs for my pdp 11/34 and 11/05. I have just been
stacking them upright, but that has not been the safest or the most space
efficient. Were any kinds of shelves made for these disk packs, perhaps
similar to 9 track hanging tape racks? Trying to make things look more
organized too.
Hoping someone here has one and can share a pic, perhaps it is a design i
can duplicate and make with some woodworking tools.
Thanks,
Devin D.
If all goes well I will be driving up to WCFMW on Friday, Sep 9th, with a
van loaded with DEC and PC items.
If you are interested in any DEC gear, please contact me as early as
possible so I can get it loaded.
If you want to stop here on your way to or from VCFMW, please contact me
ASAP to set up a day and time. I am located about 12 miles west of
Champaign, IL ( I-57, I-74), which is about 2 1/2 or 3 hours south of WCFMW.
If anyone is interested in DEC chips, I will be taking offers on several
DEC boards (M7819, DZ11 and M8044, MSV11-DD come to mind- I have dozens of
each) with the gold fingers cut off. I hate to do this, and you might hate
it too, but I have a lot of stuff sitting here for years that need to go. I
also have an assortment of several thousand unused ECL chips.
Please contact me off list if you have any interest or questions. If you
wish to talk, I will gladly give you my phone # off list.
Thanks, Paul
I picked up a VT220 passing by some clean out a while ago.
Green phosphor, powers up and passes self test.
The keyboard has 3 broken function row keys, keycaps.
Free to pickup in North Andover.
Shipping would be heavy and awkward with the CRT.
Dave.
Sent from Mail for Windows
