But this device is out of stock. Anyone hunted down schematics or firmware source for this device?
Except it does. :)
The VICE Commodore computer emulator can use an external program called TCPSer to provide an emulated Commodore PC with a virtual modem. The command ATDT ip-address:port can be used to connect to telnet-ready or vanilla-TCP BBS's with vintage terminal software.
Anyone have any pointers?
[Edit: reading other comments, probably I want to look into "v.32bis", etc.]
negotiation protocol: https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-V.8b...
edit: you and me both :) I,v been semi obsessed with writing my own soft modem ever since I saw Oonas sound of dialup writeup.
That doesn't mean I'm not gonna try hooking up my old hayes compatible, but I'm on prepaid so I don't have to care.
For me, calling a BBS will always be a modem and modem tones. I would like this more if there was a way to open a TCP connection directly to the BBS and somehow do v.32bis tones over IP. This would constrain the connection to actual modem speeds and wouldn't require a PSTN line or a VoIP provider. It would be similar to VoIP except using a codec that was specifically designed to make those legacy modulation schemes work. Ideally, this wouldn't require a real modem but if you could use a real modem and a FXS device, that would be sweet, too.
It turned out to be much faster to make the call at 1,200 bps than at the 57.6kbps max speed of the modem.
At the high baud rates, the time the modems took just to negotiate the connection and agree on a speed (about 5-10 seconds) was far longer than it took to transmit the few bytes of data at 1,200 bps and disconnect (well under 1 second). At 1200 bps, there was no negotiation: the communication is based on FSK at fixed frequencies.
One of those weird things I mentally filed away a long time ago :-)
EDIT: Redesign is the wrong term, as that implies that it would take any effort at all.