In '75, when 8-bit microprocessors were just coming to the surface, there were hundreds of different manufacturers producing high-speed (>>50 MHz) boards on two layers. These were the exception rather than the rule, but it was happening as a matter of normal expectation. A relative few people really understood how to make it happen, though.

It's not easy to make two-layer boards run fast today either, but talented people can still make it happen.

The suggestion that a slow, lumbering MCU with a clock at 11.05 MHz that divides that clock by 12 to generate an instructin cycle taxes the two-layer technology is over-the-top, though, wouldn't you say? Even Mikey ought to be able to make that work, and even on a single-sided board. He probably shouldn't attempt it, though, until he learns a bit more about the circuit design process ... you know ... design before build ... analyze before attempting to design ... that sort of stuff.

RE