Gandalf LDS 120 Modem Innards?

[Martin Hepperle]

In the 1970s/80s, at the University, we were connected to the mainframes via terminals.
For this purpose we used small blue boxes (must have been Gandalf LDS 120 modems) to connect via 4-wire lines to remote locations.
You simply, switched the modem on and your connection at 9600 baud was established.

Internally these modems must have been rather simple - just a power supply, a modulator and a demodulator - no dialing etc intellgnece required.
Doe someone have such a box and could take some photographs of its innards?
I cannot find any technical information on the internet.

This is just to satisfy my curiosity - however, if I had a pair of them I would try to hook them up...

Martin

 

[cchhrriiss11]

Hey Martin,

Gandalf you say? I've got a bit of a Gandalf modem collection... they were Canadian, after all



The two larger modems on the bottom have some local history, they came out of BC Ferries and were used to connect the Tsawwassen Ferry Terminal to their head office, back in the 80s.

There's more info here on a post I made a year ago on Twitter:

https://twitter.com/x/status/1661132808256110597

Regards,

Chris

 

[Martin Hepperle]

Nice - the blue color and the characteristic font seem to have been part of the companies look-and-feel.

Hoever, the LDS-120 is a much smaller and simpler device...

Martin