On Thu, 23 Sep 2004 17:54:27 +0530, you wrote:

>>
>> I'm not sure it applies to this part, but I know the 12F parts are
>sensitive to Vcc risetime, which
>> can cause problems when there is capacitance or other loading on the
>supply.
>>
>
>I've noticed this, the hard way. With my home made EPIC compatible, I have
>no problems doing ICSP on 16FXXXs, but loads of them with 12F parts. Is
>there a cure to this besides using *very* short ICSP cables?

Use a moderately chunky MOSFET to drive Vcc, so it can get it to the right level quickly.
Here's the circuit I use to do in-system programming of 12fxxx parts on Picstart : 
http://www.electricstuff.co.uk/picstart_isp.pdf

This works happily with 10uf capacitance across Vdd


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