I've used that max232 ttl board with both 160 (various fiero ecms) and 8192 baud (7730) ecms. Also used it with tuner pro and aldldroid.
The chip comes mounted in a breakout board and all you...

Have you read this thread on the max232 chip? http://www.gearhead-efi.com/Fuel-Injection/showthread.php?719-Uber-easy-DIY-USB-ALDL-Cable&highlight=Max232
I originally made a two transistor cable,...