My first computer used a Zilog Z80
CPU. It was the original Sinclair/Timex Z81 which came with a giant
1,000 bytes of RAM. I think I'd like to forget it. Then on to several
Radio Shack Color Computers which were infinitely better, though the
clock speed was only one third of the Z8's speed. The Sinclair was
dragged down because the CPU had to provide all the video and sound
functions as well as normal duties.

My first "IBM Compatible", a Tandy 1000, used the 8086, if I remember
correctly. With the add-in '286 card it really flew, for the time.
Unfortunately that card blew a gasket and after keeping it for a month
Radio Shack informed me that it couldn't be repaired. From there it
was on to the '386 DX (SX was a very poor performer), '486, Pentiums,
Cyrixes and AMD's ... I've gotten as far as a dual core desktop HP
7800, but the only quad core is in my Google Nexus 7 Tablet.