Hello to all

I'm trying to use the Visisp-52 to program an AT89s8253 without success. The system reply with this message:<< The microcontroller did net respond......>>. I use to have the AT89s8252 on my board, but this one is absolete know My system is cloch at 20 mhz

By looking with a scope at the reset line, i see a burst of signal that is to fast for the RC circuit (4.7uF + 10K). Signal go high and low, but to fast and the result does not go from 0 to 5 v.

Few questions
-Do i need to modify the reset circuit so it could be use with the program?

- Is it possible to modify the parameters for programation like delay for the reset in the Visisp-52?

- Is possible to konw the sequence of signal that i could expect on the parallel port pins during an attemp of programation

Any help will be appreciated.

Martin Theriault
Montreal, Canada