Almost all Olimex boards are with simple 0.1" ICSP connectors. Microchip have decided to use a phone jack cable for their tools and boards which is huge in size. The new mini boards where space is critical can't use both of these, so we introduced the new ICSP-mini connector with a 0.05" step. The PIC-ICSP is 3-way connector which allows bridging between development tools which use different connectors.