Hi anmabagima,
Searched for the cable yesterday, didn't find it (I'll search again this evening).
About the communication.
I just remember using Twin Express.
In the archive there are 2 programs, one to run on the Amiga and one on the pc.
Start both up with the same settings (for baud, etc.) and it should work both ways.
As I told you yesterday, I used this program a lot of times without any problems.
Bye,
Spidey