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PostPosted: Wed Jun 25, 2008 2:28 pm 
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Joined: Mon Feb 25, 2008 6:19 pm
Posts: 102
Location: Belgium, Nieuwpoort
Hi,
In some cases it is not possible to reprogram PIC's of which the PGC and PGD pins are used by the PIC program for outputting a "1" (and are as such cannot be controlled by the K8048 programmer any more).
This thread http://forum.microchip.com/tm.aspx?m=347029 suggests to drive the PGC and PGD lines harder. This can be done by short circuiting R4 and R8 in the K8031 programmer (or build in a very much lower value than 1K -- I have 8R2 now --).

Anyway, it works but should be avoided (The PIC will try to deliver a rather high current into T1 and T2) I think.


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