I dont know about the older ECU's but im running a PS2000 and the laptop can be on or off plugged in or unplugged
i find power up first then connect to laptop as on new haltech it will download the current config to the laptop
Again different ECU but i had 9 pin serial port on the back of my EMB cable and picked up an adaptor cable(9pin to usb) with software for $2 online.. easy fix when the laptop you are intending to use has no serial port
hope this helps
cheers
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