Talking through the ideas behind my Fast PDIP 6502 Computer that currently runs at clock speeds up to 35MHz, including how the Clock Stretching circuit works.
Hackaday.io page with schematics and more details: https://hackaday.io/project/192630-fast-pdip-6502-computer
6502.org forum thread with design discussion: http://forum.6502.org/viewtopic.php?f=4&t=7670
00:00 Intro
02:04 Typical 6502 architecture
03:21 Bus cycle types
04:29 Clock stretching
06:06 Clock stretching circuit
08:56 CPU module schematic
09:50 I/O module schematic
12:43 Breadboard prototype
13:22 PCB based ststem
15:46 Outro