I didn't see this info on mainbyte. It wasn't too hard to figure out from the theory on this page:
But I thought I'd share a couple pictures of my alpha lock mod for the STACKPOLE keyboard.
Here is the keyboard back side. This seems to be a single sided circuit board, but with vertical jumpers all over the underside. This would be easy to just replace one of the jumpers with the diode, except the actual keys are all in the way, and I didn't want to take that apart.
stackpole-labelling.jpg 331.58KB 6 downloads
Here, I cut the trace close to the place where I then scraped the far side bare, so I could solder the diode directly to the board.
stackpole-adddiode.jpg 68.78KB 6 downloads
There is clearly a more obvious and better place to cut the trace, closer to were I attached the diode. But this worked fine.
In case anyone was hesitant to perform the alpha-lock fix because it wasn't spelled out on mainbyte, here ya go.
(Only after this, did I notice how many game titles have - remove alpha lock on the title screen )