A short video showing how I boosted my ACA1220 to 33Mhz.
Update 14/02/2016 : 40Mhz + 120Mhz memory combination won’t work – due to wait states being required I think. This means the maximum you can run an 020 on the ACA1220 is 33Mhz. Unless there’s a way to change the CPU clock divider from /3 to /2. Ideally I would like to run memory at 100Mhz and CPU at 50Mhz. The new 25Mhz 020 I’ve fitted is barely luke warm at 33Mhz so it doesn’t need a heatsink now. It might be possible to swap the RAM out for faster RAM that might not require the same delay this RAM needs when running over 100Mhz. In order to get 33Mhz you don’t need to swap out the Crystal. You can just set R1 and R4.
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