Thanks Phil.

I will try your suggestion even though man pages are not as descriptive/detailed as I'd like.

I was 17 when I was first introduced to the computer by Canadian National Railways and it was only communicative via the paper punch system, the Sinclair with dip switches for programming came years later, you had to soldier it together yourself and shortly later the Atari 400 with the 6502 was followed almost immediately by the Commodore 64 which most people consider to be the first personal computer for home use. I always think of the Sinclair as the first home computer. It was featured in, if my memory serves me right, Popular Mechanics, and you could order it from them. The Atari was neat as you could both read from and write to its ports, add an optisolator and you could interface to an external TTL circuit. Cmos had not been invented at that time as far as I recall.
I think the Vic used the Z80, is that right?

What books do you recommend?

Regards
Ouldefauder