(70s or 80s)
its little bit depressive movie.
its seems like the movie “pursuit of happiness”.
Actually when I first saw “pursuit of happiness” thouth its new version of this movie.
Before computers became popular or beginning of using computers in daily life,
Computer programmer -I guess- travel with his son like homeless.( I dont remember beginning)
He is carrying computer by his side (like mini TV) and boy has something like keyboard.
One of his girl friend helps him but he lost his faith.
At the end, (they stay in girls house) he gave up and decide to suicide, while he walk in to water/lake/sea, -in home- phone rings.
Next scene he, his son and girl in the front of school (I guess) and has car ( may be BMW 🙂 ).
he became rich or got job with good sallary.

Edited question