PIC16F877A JDM Programmer Problem

[makontrack]

Hi all !

We are using a modified JDM Programmer (cct diagram attached). We have successfully programmed 6 different PIC ic's (those had internal oscillators). But now, we need to program PIC16F877A that doesn't have an internal oscillator.

We are using PICPgm to program. It fails to auto-detect PIC16F877A. WinPIC and IC-PROG also fail to program it.

Since we find the JDM Programmer convenient, can anyone please suggest what changes w.r.t the programming software should be done ?

**broken link removed**

 

[jaycec]

where is the cicrcuit diagram?

 

[zerxes16]

where is the schematic?

 

[wp100]

Hi,

You do not say which chip you have programmed ok, though doubt having the internal osc makes any difference with Pics.

Are you sure the 877A is good ? - have you tried more than that one 877A chip ?

I've programmed them ok with WinPic, have you connected all 4 VDD and VSS pins ? perhaps try pulling the LV PGM pin to ground.