Have you considered David Lien's book? One version of it came bundled with the TRS80.
On Fri, 27 May 2016, Ali wrote:
I am not familiar with his book. I will look around and see f I can find a used copy on the usual sites.
https://archive.org/details/Level_1_Users_Manual_1977_David_Lienbut, you might prefer some of his later more stuff, more specific to PC, etc.
