[rahimnathwani]

This resonates with me. My first computer was an Acorn Electron. IIRC the user guide included things about IRQs, 6502 assembly language, and even details like using 'two pass assembly' to assemble a program which referred to a something before that thing had been defined.

My first PC came with instructions on how to connect the keyboard, mouse and monitor. I recall thinking it was really strange that something could be sold without instructions on all its functions. Until then every electronic device I'd bought came with instructions that were 'complete' in the sense that everything you could do in normal use was documented.