The technical bit
This is where it gets to the choices. There are several ways this can be done, and I present here a selection of those. Each have pros and cons. All involve desoldering the chips, so should not be undertaken without suitable experience and equipment.
Method 1 - Permanent installThis is the way I normally do these modifications, it is permanent in that tracks have to be cut, but that's fine if you don't plan to go back to 16K at any point. Step one is to remove U5-U8. I use a desoldering gun and lots of flux, going slowly and carefully trying not to damage the board or the chips. If done properly, the chips will just drop out. No levering should ever be required,
Diag 264 cartridges with shinny gold plated edge connector.
Method 2 - Mod boardThis was a machine that was sent in for repair. The owner had problems installing this 64K upgrade. Have you spotted the problem yet?
Method 3 - Reversible versionWhilst using a board like that above does give a neat solution, I did try a third method, sort of a combination of both of the other methods.
internal SD2IEC to.
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