Some revisions (maybe all?) have another clockport pad on the mobo, you just have to solder on the pins
Wrong. Some of the oldest revisions indeed have some more pins, but that is where the 1 MB ChipRAM Upgrade (with clock) should go. The original design was to sell the A1200 with 1 MB ChipRAM and sell an 1 MB with clock upgrade.
The A1200 endet up getting the full 2 MB right away (but no clock) So in later revision the pins that carry the datalines for the ChipRAM expansion were omitted. The pins for the clockpart remained and became the clockport.
