In 1982 I was a young man with a young family?? my fascination with electronics and the like told me
I had to take note of the home computer boom!! so I saved and brought a Commodore Vic-20. A 6502 processor
based machine(TOY) with 3.5Kb of memory and programs loaded via a cassette tape deck. As you may guess
I soon grow tired of this.
I then built something called a UK101 this as its name suggest was a BRITISH copy of a US superboard, another 6502 based machine, but more memory 16K at least, I added a sound chip the AY-3-8910 from General Instuments.This chip also included 2 indirectly addressed 8 bit I/O ports, so I added joysticks too. The system clock was run from a simple NE555 timer chip, the frequency changed has the machine warmed up (the mains transformer was inside the case, as was the keyboard, etc) so a tape program that loaded earlier did'ent always do so next time...
At this time the photographic retailer I worked for (and still do) decided to get into computers, being the only one there that know one end from the other I got the job of selling them. So I went on courses for BBC's Atari's Commodore 64's and sold more Spectrums than I care to remember! and the Prism 1200Bd modem that went with it. It was bulletting boards then the very slow forerunner of the Internet..
But I still needed something else, the most popular proccessor was the Z80 from Zilog this was used in Spectrums, Lynx's Sharp's MZ80A/K, Nascoms and many more. It also supported the CP/M disk operating system (a DOS to you).
My next machine