WP 34S - best cable layout ?

[Dominique]

Hi,

I'm currently trying to build my own WP34S from a HP30b (my own usage, and challenge !).
I've seen many types of circuit layouts to build a cable to flash with the new firmware but what is the best one ?
Also, some have only an "erase button" whereas others have "Erase + Reset buttons": what is strictly sufficient ?

Thanks !
Dominique