http://www.microchip.com/wwwproducts/en/DM870A
http://ww1.microchip.com/downloads/en/devicedoc/dm870db.pdf
http://www.rumjd.com/Attachments/201510/20151021_145146_184.pdf
https://wikidevi.com/wiki/Standard_Microsystems_CX870-3B
https://fccid.io/ZQO-CX8703B
https://www.pioneeraudio.com.au/products/x-smc55