Who's talking about the breadbox? I'm *of course* talking about the predicessor of the Amiga, the Atari 8-bit machines by Jay Miner. (-:
I'm a big fan of hacking 8 bit Ataris (I even have one 130XE with a 63B09 in it).
But the gpu steals cycle from the cpu in that design, making the difference between a 1 MHz "breadbox" and a 1.78 MHz Atari negligible.
Beside, those two rely on MOS cpus, and I've always preferred real Motorola.
It is curious that the 68000 doesn't access memory any faster (just over a larger bus), what the 8 bit cpus do in one cycle, the "better" cpu takes four cycles to accomplish.
I kind of miss the 8 bit stuff (except for that 64K address limitation).