It has been very difficult to understand for me in a 100% the instructions PUSH & POP.
(I understand the meaning “First in, Last Out” - LIFO - but never to make a program with these two instructions ( every time those that I tried, always had errors)

You could send me one program written with his later one “;” explanation in each line
after the instructions? (Please that is not for debug of the O.S.)
Please, I ask you that you write a program “in 8 bits” not to have YOU EXTEND AX (for example)
but to use the classic AXBXCXDX; Please I ask you you do not use a program difficult to understand,
but that the program allows me to obtain one COM or EXE file. Please not to use POPA and PUSHA.

(*) It would help much that you can use in the beginning of the program written directives
like, .086, .286 (not more)
and then, .COMPACT, .SMALL, .LARGE, .HUGE, etc.

Thank you very much to read this message.