Astec are a Taiwanese company that manufacture thin clients and cloud computing solutions.
Their website is unfortunately current and forward looking - there is next to nothing there about past products and the support page is '..fill in a form and ask' rather than having a list of past models, directly downloadable updates, and such like.
In this section I currently have an entry for the A3500s that is part of the A3C family that was launched sometime before mid-2008. My sample had been rebadged by thinspace whose web site (www.thinspace.com) had no reference to older products (in May 2014) and now (2020) looks like it has vanished.
Any comments? email me. Last update June 2020