Commodore Amiga and Atari ST were 16-bit 68000 chips.

The BBC Micro was 8 bit and a 6502 chip, that era had at least the following:

BBC Atom, Micro, Electron, Master

Commodore Pet, Vic32, Commodore 64

Atari 400/800 XL

Tandy TRS80

Oric Atmos

Sinclair ZX80, 81, Spectrum, QL

Amstrad CPC 464

Dragon 32/64

MSX machines

The Sinclair QL was a 68k machine, not an 8-bit (and famously what Linus Torvalds had before he got a 386 based PC).

Edit: 8-bit data bus though, which I didn't know until reading up on the Motorola 68008 just now! Trust Uncle Clive to cheap-out as usual...

I cut my teeth on a ZX81 and even had a Spectrum +3 later on - that was the last gasp of the 8-bit Z80 Sinclair line, although the IP was owned by Amstrad by then.

I am not sure what your point is here.

You miscategorize most of the lines in this list.

> Commodore Amiga and Atari ST were 16-bit 68000 chips.

And the Mac which outsold both in the long run.

You missed:

Sinclair QL -- also a MC 680x0.

> The BBC Micro was 8 bit and a 6502 chip, that era had at least the following:

> BBC Atom, Micro, Electron, Master

> Commodore Pet, Vic32, Commodore 64

> Atari 400/800 XL

All 6502, yes. But you missed:

> Oric Atmos

Then you do not have a category for Zilog kit.

Powered by the Z80:

> Tandy TRS80

> Sinclair ZX80, 81, Spectrum, QL

Not the QL, no.

> Amstrad CPC 464

> MSX machines

Then another error. This line:

> Dragon 32/64

Is neither 6502 nor Z80. It is a Motorola 6809, along with 1 model of TRS-80.

Given this confusion I am not sure what you were trying to say.