View source for Wiedmann BTX Modul

BTX Adapter for Expansion Port of Schneider Joyce (aka [[Amstrad PCW Expansion Port]]). From German company [[Wiedmann]], though the PCB seems to be made by [[Dobbertin]].

The device won't fit to the CPC6128 expansion port (which has different pin-outs as than Joyce) (and for the CPC6128, the connector would need to be mounted top-down).

Although case and PCB are marked "BTX", the chipset looks more like that of a RS232 interface, so it's probably only part of a BTX interface, and additionally requires an external BTX modem.

* Type: PC/HC Adapter
* Country: Germany
* Protocol: CEPT
* Year: 6-1989
* ID Number: 20110
* See also - http://btxmuseum.de/Hardware/ (german)

== Pictures ==

<gallery>
File:WIEDMANNJoyceBtxModul.jpg
File:WIEDMANNJoyceBtxModul-2.jpg
File:WIEDMANNJoyceBtxModul-1.jpg
File:WIEDMANNJoyceBtxModul-3.jpg
</gallery>

== Chipset ==

* NEC D8251AFC - [[8251 USART chip|8251 chip]] - usart
* NEC D8253C-2 - [[8253 chip]] - triple 16bit timer
* MC1488N - Quad Line Driver
* MC1489N - Quad Line Receiver
* 74LS138N - 3-line to 8-line decoder / demultiplexer
* NE555N - General Purpose Single Bipolar Timer

[[Category:Network]]