Hiya Vitaliy,

> It so happens that my friend and I are trying to use the programmer
supplied
> with your book to program the 16F74.  From what I understand, it has a
> different algorithm for erasing (as opposed to 16C74).  Since our chip is
> not listed under El Cheapo's drop down menu, my friend wrote a
console-based
> driver of his own.  After about three evenings, I got it to work on my
> programmer by adding a 47nF capacitor at 78L12's GND and OUT pins.  The
bad
> news is, that didn't solve the problem for him - after erasing, the last
> word is still 0x0, not 0x3FF as it should be, and the chip is therefore
not
> being programmed.  Other chips are programmed just fine.

What chip did you select for the programming?  If you selected the
"PIC16C74", then it might work once.

I think you'll find that it will work if you select a PIC16F876 instead.
You should be using Version 0.77 (which is available for download off of my
web page).

> There must be a good reason why you didn't include the 16F7X series in the
> list of supported devices.  Other than the differences you listed above,
are
> there any others that affect El Cheapo's ability to program our chip?

Uhmmm...  The only reason why I haven't included it is because nobody has
asked for it before.  I'm trying to finalize a new version (0.80 - I am
merging a new home built circuit to the PCB circuit so I don't have two
versions of the software to support) which I can add the PIC16F7x part
numbers to it.

In any case, I've just ordered a couple each of the PIC16F73 and PIC17F77
from Digi-Key (they were out of stock on the PIC16F74).  I should get them
tomorrow night and let you know if there are any issues with them.

Sorry for the hassles,

myke

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