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Schneider Btx-Modul für BTX module for the CPC 464/664/6128. Based The hardware design is based on a universal Btx-Decoder from BTX decoder made by Siemens. The device It is connected to the CPC's expansion port, and additionally connected hooked in between computer and monitor. Unknown if the device includes the actual The module must also be connected to a BTX modem builtwith a D-inBT 03 port... probably, one needed These modems were provided by the Deutsche Post and had to rent be returned after use, because the BTX modem from Deutsche Bundespost separatelysubscriber ID was hard-coded within the device.

BTX (Bildschirmtext, translated as Screentext) has been a german German service, allowing to transfer data via telephone line. In the 8bit era, the Deutsche Bundespost (german German postal service) still owned the monopoly for telecommunications in germanyGermany, so the only (legal) way to transmit electronic data via telephone line has been to use their BTX service. The service was ultimatively suspended in 2007. Beginning in late 2019, some work has begun to revive parts of the BTX service. There are [https://btx-museum.de/2020/02/29/der-neue-dbt-03-emulator/ emulators providing D-BT 03 ports], and some BTX pages were [https://www.heise.de/newsticker/meldung/36C3-Congress-wie-1984-mit-BTX-und-Originalarchiven-4624507.html restored by feeding recordings of original modem sessions to software demodulators].