M. Morris Mano is the author of the widely used textbook "Computer System Architecture, 3rd Edition" on the Topic of Computer Organization, Architecture, Design and Assembly Language Programming. The book provides basic knowledge necessary to understand the hardware operation of digital computers.
Mano Simulator App is an Assembler and Simulator of a 16-bit Microprocessor that has been designed in this book. You can write programs in assembly language and can see its machine code and can execute / simulate in this app.