Hello all,
I am using 12F629, 16F628, and some of the 18F devices.
I cannot use LVP mode for ICSP.
I am using computers that run WinXP.

Before I ask the question, I will say that I have tried
using IC-PROG and it doesn't work with the two circuits
that I tried from the IC-PROG webpage ( for the devices
I have listed ).  In fact, it won't work at all with
the printer port.

I have use of a programmer at work, which I used to load
a few of the devices and then tried to just read them
using the 'JDM' and 'TAIT Serial' circuits.  Neither
circuit can read them.  I wrote my own software using
the printer port and 'TAIT classic' circuit and the
PIC device never communicates.  When I plug the PIC
device in at work, it reads it fine.

After looking at the programming spec for the different
chips, I noticed that Vdd and Vpp have to be applied in
a different sequence depending on the chip.  Perhaps
Microchip made an error in the programming spec ?

Has anybody been able to program these devices using
WinXP software and a homemade circuit for High Voltage
programming ?

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