I am not able to see the notes corresponding to the lectures?
Also, my understanding is that an impact printer has only one printhead? I took a quiz ( Random Flash Cards) and it showed that the Impact printer has 4 Printheads?
Thank you in advance for the help
@Belkacem-Ouldsaada great question, if you might be able to post a small snippet of the question I might be able to elaborate a little more.
Impact printers come in three printhead types:
Daisy-wheel (obsolete)
Dot-matrix (9 pin and 24 pin variety)
Line printer (fastest of the impact printers)
With the two different types of dot-matrix printhead types that makes four, however without context I am not sure.
Best Regards,
Wes Bryan
Knowledge is a road to be traveled upon, not a destination to be reached~~
@wes-bryan I am also not able to see the corresponding notes for lessons on video courses. 
Looks like the request is being blocked due to cross origin resource sharing. I've only ever dealt with this during web development with production API's not accepting requests from development local host browsers. Usually fixed by using a proxy server to make a request, but i have no idea how to program that straight into the browser.
Thanks for letting us know. We're working on it as we speak! 
Thank for being a member.
Cordially,
Ronnie Wong
Edutainer Manager, ACI Learning [ITPRO]
*if the post has answered the question, mark as solved.
**All "answers" and responses are offered "as is" and my opinion. There is no implied service, support, or guarantee by ITProTV.
