Multiple Modem Support
Added multiple modem support into the dial up server. Set the modem initialization strings in the configuration file along with the com ports for each modem required.
Plugged in the Hayes and the USB modem below and configured them in the new settings file.
Tried to get the USB modem to work, it responds as expected but there is something wrong with the data being sent to the terminal. It looks like its not using 7 even one, not sure why this is the case.
You can see it is sending the screen as certain characters are displayed correctly, it seems to be messing up the rest.
Have played around with several of the modem settings and can't seem to get this to work correctly, the Hayes modem works perfectly with the same settings.
After some more investigation it seems that the USB modem is using the wrong parity setting, it appears to be using odd parity even when I've asked for even.
Dial Up Server
Created a dial up server that connects to the back end ViewData service. The server can be run as a windows service or a console app.
Got the server to connect to the back end when the modem goes online, key presses were going from the terminal to the back end correctly but everything on the terminal screen was garbage.
Checked the back end was sending data to the dial up server and the characters expected seemed to be being sent to the terminal.
All I was getting was this...
Searched through the code and found the problem, after checking the serial settings over I noticed that the parity was set to None and it needed to be Even.
Changed the settings and got a connection from the back end.
Once this was working fixed a few things and tweaked the server to ensure that it disconnects from the back end correctly on modem disconnection.
Now that the server was working I've added some back end infrastructure to help me build pages etc. To start with the system now displays a nice "CONNECTED" message once it connects to the back end. Once you have finished on the system and exit from the menus the system will display "CONNECTION TERMINATED" and disconnect the modem.
So to demonstrate the system working I built a quick screen which loads from the server, the next step is to add a menu system.
I decided that the system should have a nice welcome screen which should pay homage to the original Prestel system...
To show the entire system working I knocked together a quick video if the system being dialed by the terminal...
Initial Testing Setup
Well managed to get everything talking, the setup is as follows...
Setup to allow me to dial between the machines, the PBX has 8 ports and 3 external lines. Eventually the idea is to connect the incoming modems to it and allow incoming connections via dialup.
Hayes Acura Modem
This is currently the modem I'm using for development as its a great modem and is pretty solid. Its one of 4 that I have which are brand new and still in their boxes.
This is connected to my development PC using a serial to USB adapter, eventually I either want to use the USB modems or have the 4 Acura modems connected to a serial card.
This is a black and white VideoTex terminal from Alcatel. It was a new boxed item that hasn't been used and would have probably been the sort of terminal used in France up until the demise of Minitel in 2012.
BT 746 Rotary Telephone
I acquired this the other day to complete my 80s retro desk setup. It is pulse dial only and does not work with the PBX but I have a new DTMF upgrade to fit to it before the end of the challenge. There's is something quite satisfying about dialing the modem with it.
Used Putty to create a terminal connection to the modem, manually setup the modem using AT commands and set it to auto answer.
Dialled into the modem from the Terminal and they connected ok.
Once in could type on both Terminal and Putty and they were exchanging data correctly.
And its all go for the 2014 - Winter Warm Up Retro Challenge...
... except I've done nothing so far and it looks like it will be at least the weekend before the issue that has had me staying late at a customers for the last week is sorted.
Intend to actually do something over the weekend as I've managed to completely write off the Christmas period and will have to return properly to work on Monday (not that I've not been continuously working for the last week) so if I don't get started then its not going to be looking good for completing anything in time.
Anyway did manage to look at some of the other entries and have to say there are some amazing projects lined up.
Will be looking forward to seeing what everyone manages to complete at the end of the month.