Hi,

I have an EPIC and am currently using it in an in-circuit-programming
configuration for a 16F84. I just placed a resistor (from 2K to 10K)
between any pin that is being used in my circuit and my circuit, and have a
jack ( IDC header) that allows me to plug and unplug the programmer. When
the programmer is hooked up, its pins are connected directly to the
appropriate PIC pins, and isolated from the rest of the circuit by the
resistors. As for power, I simply have a jumper that allows me to switch
the power source from internal power to the power from the programmer. I
also included a jumper which allows me to short the oscillator pins
together to prevent osc. start up. However, I have found that I do not need
to switch either of these two jumpers in this case,as long as the circuit
is powered down. I also do have to admit that RB6 and RB7 are not used in
my app, so no resistor isolation was needed on them,but I don't think there
would be a problem even if they were being used.

Sean

At 04:03 PM 6/18/99 +1000, you wrote:
>Other designs rely on passive pull-up resistors to drive the data signals
>and this
>again is not helpful to your cause.
>(EPIC, P16PRO and other DIY-HK programmers, DT001, PROPIC I&II, and other
>TAIT style
>derivatives)
>

|
| Sean Breheny
| Amateur Radio Callsign: KA3YXM
| Electrical Engineering Student
\--------------=----------------
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