Thanks Neil for the answers, it was helpful.

However, you did not answer question 4 above.

Michael

We are attempting to program the Atmel device AT89C51ED2 using the ISP method. The programmer is Dataman 48Pro2C. The device selected is Atmel AT89C51ED2-xm (ISP). My questions are: 1. It's not clear to me what the Hardware Security Byte (HSB) check boxes indicate in the attached screen shot. When c...