Schneider Btx-Modul für CPC 464/664/6128. Based on a universal Btx-Decoder from Siemens. The device is connected to expansion port, and additionally connected between computer and monitor.== Description ==
Unknown if Schneider BTX module for the device includes the actual modem built-inCPC.The hardware design is based on a universal BTX decoder made by Siemens.. probably, one needed It is connected to rent the CPC's expansion port and additionally hooked in between computer and monitor. The module must also be connected to a BTX modem from with a D-BT 03 port. These modems were provided by the Deutsche Bundespost separatelyPost and had to be returned after use, because the BTX subscriber ID was hard-coded within the device.
* Type: PC/HC-Decoder
* Protocol: CEPT
* ID Numbers: P07747, Siemens S30817-K732-A101-1 / A30817-X732-A100-1, Schneider Ident Nr. 36445 or 36486
* See also: http://btxmuseum.de/Hardware/ (german)
== Bildschirmtext (BTX) ==
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].
== Pictures ==
File:SchneiderBtxModulCPC36486.jpg
File:SchneiderBtxModulCPC36486-2.jpg
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=== PCB ===
<gallery>
File:Schneider BTX Modul - top.jpg|Top
File:Schneider BTX Modul - bottom.jpg|Bottom
</gallery>
'''Note''': Schneider also made a BTX module for Schneider Television Sets, although that device had nothing to do with the CPC, its housing was later re-used for the CPC's [[Schneider RS232 Interface]].
== Downloads ==
* [[Media:Schneider BTX Modul ROM dump.zip|Schneider BTX module ROM dump]]
* [[Media:Schneider BTX Modul Manual (German).pdf|Manual (German)]]
* [[Media:Schneider BTX Modul Geraete-Pass.pdf|Certificate for HiFi-Systems (Geräte-Paß)]]
* [[Media:Schneider BTX Modul Box.pdf|Scan of the box]]
== Weblinks ==
* http://en.wikipedia.org/wiki/Bildschirmtext - wikipedia article on BTX (english, short description)* http://de.wikipedia.org/wiki/Bildschirmtext - wikipedia article on BTX (german, more detailed description)* https://btx-museum.de/2020/02/29/der-neue-dbt-03-emulator/ (german)* https://www.heise.de/newsticker/meldung/36C3-Congress-wie-1984-mit-BTX-und-Originalarchiven-4624507.html (german) [[Category:Network]]