Thanks for the answers.
I think that i'll make an adapter socket that goes between the jdm and the pic. This adapter only needs a 4.7k resitor from pin 10 to gnd, right?

Juan Cubillo

-----Original Message-----
From: "Dennis J. Murray"<denbarb@verizon.net>
Sent: 1/6/2006 7:23:12 AM
To: "Microcontroller discussion list - Public."<piclist@mit.edu>
Cc: 
Subject: Re: [PIC]628 programming help

I have a generic programmer that is supposedly similar to the JDM 
programmer and also uses IC-Prog, which DOES support the '628 nicely. 
One point you need to be aware of (and I don't know if the real JDM 
programmer handles this - mine didn't) is that, unlike the 'F84, the 
'F628 has a PGM pin (pin 10) which must be tied LOW for programming a 
'628. If this is NOT done, your programming of the chip may be erratic 
at best! The schematic should tell you if there is a pull-down or not.

Been there, done that - easily remedied when you know what to look for! 
I just added a switch to flip which inserts a pull-down resistor when I 
need to program a chip needing PGM LOW. My programmer programs a LOT of 
the PIC line and uses a 40-pin ZIF for the programming socket. I didn't 
feel comfortable that I could guarantee every chip programmed would be 
happy with that pin pulled low, thus the switch.

Good luck!
Dennis


Maarten Hofman wrote:

>>After one year of struggling with my jdm programmer I was finally able to get it working. It has a 18 pin socket for a 16F84A. What do I need to add to make it work with a 16F628???
>>    
>>
>
>A 16F628 should work fine. Just use software that supports it (IC-prog
>works, for example). Note that a 16F628A might not work (although my
>JDM handles 16F628A with no problems).
>
>Greetings,
>Maarten Hofman.
>
>  
>

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