yup, criscrossed. In to out and out to in, but i only have a tr707 and its midi is very basic, i dont know how to test it on the midi the voltages are all ok. like TK said on the core page. Check those 4 points for 5v. i get 5.02v in all 4 place(3 on ic1 and 1 on ic2) its a kit from smashtv. im using board mount ports, they only go 1 way. all parts are in the correct places. i programmed 2 pics(i got 6 samples of the 877 and 6 of the 452) and they both verify ok(the 2 i programmed with the bootloader