* When this switch is ON, the DTR signal from the remote side of the serial link is plugged to the DSR line of the UART controller. It then generates an interrupt which the CPC can process.
== Software ===== Software supporting the Albireo ===
* [[UniDOS]] ([[AMSDOS]] compatible and modular DOS; see [https://unidos.cpcscene.net UniDOS official website])
* [[SymbOS]] (both USB mass storage devices and USB mouse; supports two Albireos connected at the same time)
* [[HDCPM]] (Support booting and running CP/M Plus from SD card)
* [[AlbiDOS]] **'''deprecated''', replaced by [[UniDOS]]** ([[AMSDOS]] compatible DOS driver; see [https://framagit.org/shinra/albireo/albireodos/-/wikis/home AlbiDOS documentation])
=== Upcoming software ===
* Serial communication to communicate with a PC
== List of compatible mouses ==