Acorn Teletext Adapter
BeebEm emulates the Acorn ANE01 Teletext Adapter. It can be used in two ways: either by loading files containing captured teletext signals, or by connecting to packet servers providing real-time teletext signals.
The ATS-3.0-1.rom must be added to the ROM configuration and Hardware → Teletext Adapter On/Off enabled.
Use the Hardware → Select Teletext Data Source menu item to select the capture files or packet server to use as source data for the teletext adapter.
Capture Files
By default, teletext capture files named txt0.dat, txt1.dat, txt2.dat, and txt3.dat, are read from your DiscIms folder when Capture Files is selected as the source. Use the Browse buttons to select the files to use for each channel.
You can download some sample teletext data from Jon Welch's website.
Packet Server
Real-time teletext packet input is supported using a simple TCP stream interface. An example packet server written in Python is available on GitHub. By default BeebEm will attempt four connections to ports 19761 to 19764 on the host PC (IP address 127.0.0.1) for the four tuner presets respectively.
Alternative IP addresses and ports can be set by changing the source to TCP/IP.