At 13:21 6/10/99 +1300, you wrote:



If by accident you programmed the 16C73A as a 16C73 then this will cause the
exact problems are you reporting. An illegal code protect problem and
an in ability to program the part further. This will happen even if you (or
someone else before you) had programmed a completely blank (all 3FFFh) file.

This condition is fatal. There is no way but if this is what has been done. I
hope not though.

Also I think the programming VPP is pretty marginal. another 0.25 volts might
help but I would check the voltage again first to see if it is really that
low. 13V is the best middle ground.

Jim


>I've just bought one of these & am trying to program it with a PICSTART II
>
>Am Running MPLab 4.12.00 on an NT system (with the appropriate DLL)
>
>But it won't read or program - tells me the Code Protect is "Illegal".
>
>I've tried about an hour of UV Eraser - no change. Also I can't program or
>read an OTP 16C73B part as it it thinks that the protect bit on this one is
>set - again a brand new part that's never been programmed.
>
>I can however read an older '73A JW part which has been previously
>programmed.
>
>I suspect timing and/or voltage levels (supply at 4.83Vss and Vpp @ about
>12.5)
>Or - have I done something to the PICSTART II ?
>
>Any ideas would be greatly appreciated
>
>Richard P
>
Regards,

Jim Robertson
NEWFOUND ELECTRONICS
________________________________________
Email: newfound@pipeline.com.au
http://www.new-elect.com
MPLAB compatible PIC programmers.
________________________________________