Shahid,

I too built the propic programmer and also used 2N3904 and 2N3906.  I've
only tried programming 16C84 and 16F84 .... works great.  I set my VDDmin
to 4.5V.

Did you remember to put caps on the RB6 and RB7 lines?

-Randie
rohtsji@glenayre.com


> From sheikh@EROLS.COM Sun Mar 15 11:44:40 1998
> Encoding: 25 TEXT, 48 UUENCODE
> X-MS-Attachment: WINMAIL.DAT 0 00-00-1980 00:00
> Date:         Sun, 15 Mar 1998 13:53:00 -0500
> From: Shahid Sheikh <sheikh@EROLS.COM>
> Subject:      Problems with the ProPic programmer (newbie)
> To: PICLIST@MITVMA.MIT.EDU
>
> Hi all,
>
> I just made a propic v4.2 (from TATO Computers) programmer and when I read
> a blank (new) 12C509JW in it, it gives me 3FFF on all the locations. That
> is the same stuff I get if there is no pic on the programmer. The
> programmer seems to be working OK as it turns on and off all the supplies
> to the pic just fine. All my voltage levels are fairly accurate as well
> (VPP1=12.98V, VDDprog=4.97V, VDDmax=5.50V and VDDmin=2.54V).
>
> The only significant changes to the circuit I've made is that I've used
> 2N3904 and 2N3906 instead of BC547 and BC557 and I dont have a VPP2 on my
> programmer.
>
> I know this information is vague but anyone has any idea why this may be
> happening? I have a 3 ft cable connecting to the parallel port of my laptop
> (Compaq Armada 4120). Is that cable too long? It was originally a shielded
> parallel port printer cable with shielding connected to the DB25 cover.
>
> At this point I only have a 12C509JW and a 16C54AJW and both of them are
> new. Is a new 508/509 supposed to read all 0's except for the last
> location?
>
> Any help would be greatly appreciated.
>
> Shahid
>
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>