Copy Corner was a great article written in INFO magazine.
Here is a great article comparing seven popular copier at the time
Above is the chart and here is the article.
This is from INFO 64 June 1985
Copy Corner was a great article written in INFO magazine. If first appears in issue #10 which dates May 1985. There was only a few installment of this series, but they are all very interesting. The article talks about copy protection and then usually reviews one or two copy programs. It starts by saying: Copy protection just keeps getting worse. Some of the latest titles include recordings out to track 40, that is five tracks beyond what the 1541 was designed for. Here is the two page article.