How can I control the BB2 with an external microcontroller?

if you are using a standard serial cable between a bot board (of any version I think) then you will not be able to use standard serial terminal programs like hyperterminal because the DTR signal is used as a reset to the board and most terminalk programs assert both DTR and RTS when they start up. the terminal window in the various basic micro IDEs don’t have the problem of course since they know not to assert DTR when the program is running and you just need to make sure you have the bauds right and tell the IDE which port and to connect. for other terminal type programs though using a 3-wire serial connection, or putting a switch in series with the DTR line in the cable, should eliminate the problem.

I am set up with a usb-serial cable and using advanced serial port program where i can turn the RTS and DTR off. I get a constant rd signal displayed.

It doesnt respond to triangle request

(Triangle) button
10 FF EF 80 80 80 80 0D

i know the code relies on DualShock and LastButton bits so if i edit the ATOM code to “set bits” it responds when i program the chip, ie constantly goes to attack position. I want to be able to send serial commands as posted like the one above

Any advice

Thanks