If you are using the classic parallel pic programmer using 7406 or 7407 buffer, you might have noticed that this PIC programmer design is a hit and miss device. Most of the time it would program the 16F84 devices but it could give you mixed results when you are programming the 16F877′s and 18F4220′s. If you run EPICWIN with this programmer under
PCs with more than 1 Ghz of cpu speed, you are going to encounter all sorts of error like “code verify error”, “code programming error”, etc.. But if you run it on machines with CPUs running at 800 Mhz or lower, the programmer seems to work fine.