For a moment, I was wondering if this was the amazing Periscope DOS debugger that had somehow lived on (it's not). Anyway, this is the best link I could find a

For a moment, I was wondering if this was the amazing Periscope DOS debugger that had somehow lived on (it's not). Anyway, this is the best link I could find about it: https://books.google.com/books?id=-j4EAAAAMBAJ&pg=PA21&lpg=PA21&dq=periscope+debugger&source=bl&ots=xnket_qz2o&sig=ACfU3U2lvZ4YRVEefhC-lEgfZgAsvDAMlA&hl=en&sa=X&ved=2ahUKEwjAmv6EjdHtAhUHd98KHfHOD0MQ6AEwBnoECAcQAg#v=onepage&q=periscope%20debugger&f=false https://books.google.com/books?id=-j4EAAAAMBAJ&pg=PA21&lpg=P...