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I was able to program a PIC12F629 with a very simple JDM-type circuit I made on a breadboard, and ICProg.
I'm asking for your input because online orders for parts can take weeks, so I wanted to narrow down my search for a simple programmer for the PIC18F2550.
Well that sounds good if you have already programmed a chip ok, though it might be worthwhile if someone else who has used the same programmer can verify it works with a 2550 ok.
Although icprog does not list the 2550 it should program fine using the 4550 which is identical from a memory point of view.
Have done it myself on the older paralllel port programmers.
If you can program a 2550 then suggest you make yourself one of the Pickit2 Lite clones as detailed in this forum.
They are very cheap, usb , use Microchips software, work better than anything else like it, and cover virtually all the Pics
Numbers represent serial port pins, letters are abbreviations for ICSP pins.
ICSP (SV1) Pins (from Schematic 1)
1) DATA = D (in image label)
2) CLK = C (in image label)
3) GND = G (in image label)
4) VDD
5) VPP
Breadboards connections are not very trustworthy, I'd recommend buying the PICkit 2 programmer, it also works as a Logic and UART tool.
Below are the best schematics I could find for the JDM2-based PIC programmer. Schematic 2 could help in visualizing how it connects to a PIC18F microcontroller.
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