When I was in my teens I had bought an original Compaq at a used computer store for $20. I put an NEC V20 in it and added an 8MHz crystal. Rather I cut the old crystal out, soldered in 2 wires that were about a foot long and soldered the 8MHz Crystal to the other end.
Now that I understand things a bit more, I am surprised it ever worked like that.
afair original 8086/8088 required somewhat weird 1/3 duty cycle on its clock, this is why intel provided special 8284 clock generator
V20 was fine with 50% duty, but other parts of the system wouldnt work if all you did was a crystal swap,original XT used 14MHz crystal (divided by 3). turbo mod required 20MHz crystal, or 24MHz oscillator and rewiring 8284
im so old
edit:bah redundand post, everything is ins dave's video