Quote Originally Posted by hvacrtech View Post
Odd behavioral now... cant program 18f2550 but can program 16f886 no problem.

I am using PBP 2.60 and MSASMWIN 5.20 and programmer 4.31.

the other code used for 16f886 and programmed fine on 16f886. Migrated to 18F2550 with revised code used for 18F, the programmer said cannot find target device using 18f2550.

i had first three 18Fs working fine, now cant program those 18f2550s.
problem is found. custom made programmer cable too long. Using the three inch ribbon cable, it works!


Case closed.