
One such recommendation from another poster was "Working Effectively with Legacy Code" by Robert C. Martin. I looked this book up on Amazon. And on the surface it looks pretty good. It seems to cover topics like setting up a test hardness for old code.
Then I got the sticker shock. The MSRP for the book was $54.99. Ouch. That's a lot of greenbacks. But I guess this means that this is a serious subject demanding a high price. Still not ready to make an investment in this book, even with the discounted Amazon price of $46.30. But maybe I will put it on the "to buy someday" list.