17 Jan
2018
17 Jan
'18
9:47 a.m.
On Tue, Jan 16, 2018 at 11:15:48PM +0100, Peter Corlett via cctalk wrote:
On Tue, Jan 16, 2018 at 02:07:59PM -0700, Grant Taylor
via cctalk wrote:
[...]
I used the following setup to allow a Sega Dreamcast modem to connect to a
non-public webserver locally:
+--+ +-----+ +------+ +-----+
|DC|--------|470 R|------|24V DC|--------|Modem|
| | +-----+ +------+ | |
| |-------------------------------------| |
+--+ +-----+
Just a 470R current limiting resistor and a 24DC power supply. On the
answering modem I had to use "ATDR", "ATA" was only allowed after the
modem saw a RING signal.
S?ren
I doubt that will work quite like you are
thinking. There is more to an
analog phone line than the audio that comes over it. Namely the loop current
and voltage are also additional bits of signaling.
The tightwad fix is to bodge a PP3 battery onto a line splitter, which is often
enough to convince modems that there is a phone line. There is no dial tone nor
ring signal, so you need to turn off dial tone detection on the calling modem
("ATX1", IIRC) and somehow tell the answering computer to send "ATA"
to answer
at the right time.