Chapter-2: Photocopy notes
Chapter-4:
RS-232 & RS-485: http://electronicdesign.com/what-s-difference-between/what-s-difference-between-rs-232-and-rs-485-serial-interfaces ,
http://www.lammertbies.nl/comm/info/RS-232_specs.html
i2c: http://www.nxp.com/documents/user_manual/UM10204.pdf , https://en.wikipedia.org/wiki/I%C2%B2C
USB: https://en.wikipedia.org/wiki/Usb ,
SCSI: https://en.wikipedia.org/wiki/SCSI ,
RAID: http://www.serverwatch.com/tutorials/article.php/3618421/Understanding-RAID.htm , https://en.wikipedia.org/wiki/RAID