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simple 18F4550 LPT programmer

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iggyboy

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18f4550 programmer

I am building the ICD2 clone and I am using 18f4550 as a bridge to USB. Unfortunately I discovered that I do not have anything to program that particular mcu with. I found some sources, HW and SW that is supposed to work, but it doesn't. Actually I have found two sources and neither works.

I am now stuck with my proto ready and no way of uploading code to the 18F. Any ideas or links?:|

Edit:

One of my sources:

**broken link removed**
 

lpt programmer

I used this JDM to program my ICD2 (16f877A and 18f4550) along with software WinPic800 and works OK.

4cilj5e.jpg


all the diodes (ecepcion zeners) are 1n4148
Transistors are 2n2222

2dryjuo.jpg
 

18f4550 lpt

Try this link

https://www.oshonsoft.com/picprog.html

I'm having a problem uploading files so follow this link for all that you need.
There you can find the programmer diagram, software and more info.

18f4550 is supported
 

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    iggyboy

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simple lpt programmer

Ok, people. No success. Tried LPT version, but have no ideas left right now. I do have a few questions tough:

Is CLOCK (ICSP) at a constant frequency or is it skewed?

Is it possible something interferes with my LPT port and messes up the whole deal?

Couldn't probram a single byte. Something is very very wrong.

F! :|
 

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