Question: How do I remove a good chip?
Tom,
In your case there are two things you want to do....
1. Removing the faulty ram. Clip the legs off the IC, using fine snippers then desolder each leg from the board one at a time. After they are removed, clean up around the holes with solder wick.
2. Extracting a good IC from the second board.
This is tricker than 1.
I've used solder wick for this. Do a leg at a time. Start from the back side of the board where the pin protrudes out. Press the solder wick against the solder on the pin. Put the hot iron on the wick until the solder flows into the wick (you'll notice when this happens). On the first attempt, you probably wont get all the solder but don't hold the iron there too long. Just a second or two. Cut off the used wick and try to collect more solder with another attempt. Work through all pins. Then flip the board over and do the same thing with the legs as they go into the board as there is probably a little solder around them too.
Then you'll probably need to revisit the bottom of the board again and maybe the top too. Once you think you've got all the solder, get the edge of a screwdriver under the IC and just gently try and lift it. Don't force it. If it doesn't move, there is still more solder to remove.
It's laborious, exactling and takes a long time.
I would strongly, strongly advise you to try this first with both a board and an IC you don't want just for practice.
I would also advise that you don't use your other Osborne board as the source unless you are SURE you want to turn it into junk board. A good Osborne board is probably salable. If it shows garbage characters then it may be simply a single RAM IC which needs replacing on that board. This was the case with mine. You may find you soon have the skills to repair it.
All the IC's I've removed for REUSE (hence I extracted rather than just clipping them off) have been from junk boards. Hence my only concern was the IC, not the board or the tracks. Unless you are very skilled and have all the right tools, its almost impossible not to wreck the board when you are trying to extract a chip. You will probably destroy a good Osborne board which only needs a single IC replacement.
It's up to you, but if it was me, I would take up Dave_m''s offer even if it meant waiting a few days for the chip to arrive.
Good luck anyway
Terry