12.7V enough to program a PIC16F88?

[fluke]

I have a JDM programmer (Jaycar kit that i built some time ago but only just got around to trying). Using IC-Prog under Windows 98 it passes all the hardware checks, the outputs are going to the PIC socket, the input is detected from the PIC socket. But programming a 16F88 fails verification at address 0. Reading in the 16F88 gets all high bits. Vdd is 4.99V and Vpp is 12.7V. The 16F88 datasheet says Vpp should be 13V +/- 0.5V and Vdd+3.5V so it seems to be in spec. Should i try increasing it? I've tried using WinPic800 but that doesn't work either. Is there anything else i should try?

[TK.]

Unfortunatly I can only say, that increasing the voltage won't help.

JDM is known for such issues with newer PICs...

Best Regards, Thorsten.

[julienvoirin]

i used the same voltages as u did with p18.exe and it worked. maybe can u try it ?

regards

[stryd_one]

I used a SmashTV JDM with PICPGM and it worked perfectly on 452, 4620, and 4685... Writing the how-to document is on my shortlist, I'll update here when it's done.

[fluke]

I tried PICPGM and it detected the programmer fine with a fresh 16F88 in it.  I tried programming it, but still got verification errors and afterwards the programmer wasn't detected anymore.  I suspect there is something wrong with my programmer so i shall try building a MBHP Burner instead.