*[https://pulkomandy.github.io/shinra.github.io/albireo.html Albireo - Programmer's manual]
*[[Media:Ch376ds1.pdf|CH376 datasheet]] [[Media:CH376DS2.PDF|CH376 auxiliary commands]] USB flash drive and SD card controller
*[[FileMedia:CH372DS1.PDF|CH372 datasheet]] [[Media:CH372DS2.PDF|CH372 auxiliary commands]] USB device mode
*[[Media:Usb-in-a-nutshell.pdf|USB in a Nutshell]] Making Sense of the USB Standard
*[https://www.nxp.com/docs/en/data-sheet/SC16C650B.pdf SC16C650B datasheet] UART