Quote:
Originally Posted by PeteAU
If you are going to tinker with this, take care with the Kicad schematic. I think VMA (pin 19 of old 68000 socket) is driven wrongly. It should come out of a 74LS157 mux. IMO I would dump the 157s altogether and just put 5 jumpers, low-tech and smaller 
Does your clock idea cater for 21MHz for later?  |
To go beyond 14Mhz would probably be better done by a proper, modern pll.
But for a simple, old school doubler the 4046 would do the job.