Editing Goedhart VisiCom (section)

==Function==
The VisiCom is to be connected to an ordinary computer screen and can be used to transfer text over an ordinary telephone line ([http://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling DTMF]) between VisiCom users. As soon as one letter is typed it appears on the other user's screen. It works in a kind of a half duplex mode: only one user ''should'' type at the same time but both users ''can'' type simultaneously. That, however, would result in gibberish. Typing an "X" would tell your communication partner that you are done writing and it is his turn. That's why the X legend is red. The double stepped, red keys on the top of the keyboard are function keys to control the VisiCom's software interface.

In The Netherlands, there is an operator service run by the Dutch national telephone company (used to be PTT, now KPN) that translates messages between ''teksttelefoon'' users and normal, i.e. audio, telephones (used to be Teleplus, now [https://www.kpnteletolk.nl/ Teletolk]). It seems that the Goedhart VisiCom cannot be used with the new Teletolk service.