JDM programmer

First Hi to all .
Sorry for my bad English !!!

I was make pilot programmer JDM and find something interest !!!
On windows 98 SE it work 100% ok also like ICSP.
It need little modification to program new PICMICRO but it's OK.
But under windows XP SP2 it's not work OK !!!
When I programming 16F84A @ 4 MHz case problem in write to PIC and
also in ERASE PIC.
When I programming 16F84A @ 20 MHZ it's work 100% OK.
Also with 16F877A @ 20 MHZ it's work 100% OK.

Somethig is not clear in my head ;-)

Do somebody explain me that reasn ???

Best regards to all

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And I've said it before, I'll say it again, PICKit2...cheap, easy, supported, no problems...

Quote:

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Originally Posted by phoenix_1

First Hi to all .
Sorry for my bad English !!!

I was make pilot programmer JDM and find something interest !!!
On windows 98 SE it work 100% ok also like ICSP.
It need little modification to program new PICMICRO but it's OK.
But under windows XP SP2 it's not work OK !!!
When I programming 16F84A @ 4 MHz case problem in write to PIC and
also in ERASE PIC.
When I programming 16F84A @ 20 MHZ it's work 100% OK.
Also with 16F877A @ 20 MHZ it's work 100% OK.

Somethig is not clear in my head ;-)

Do somebody explain me that reasn ???

Best regards to all

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which driver software you are using? is it "picmicro"-- try using winpic800
secondly- try replacing the electrolytic caps used. and ensure that Vpp is 12.5V .Otherwise use " icprog" there is a facility for delay adjustment I saw in " icprog" -- make it 15 or 20 - it should do your job.

I agree!
Icprog works perfectly with JDM on win XP
Graham

so does winpic800. i only use icprog for the 2 chips i have that aren't supported in winpic800. i use winpic800 for everything else. also, most jdm serial port problems are solved when using an external voltage source for vpp.