>> I think you are over-reacting. The checksum and the self-check
>> code could be included into the uploaded image
>
> Then you're screwed if the self-check part of the upload image
> got corrupted.

You're too in this case of corrupted upload image. The self-check part
may be only a small part of the image, say 5%. So, 1 screwed of
1000000, or 1.05 of 1000000 for this reason would not make big
difference. Just code self-check part the way it won't burn anything
in case it gets corrupted. And, yes, bootloader with a checksum
probably would be a better choice.


> Also, this guy clearly didn't have any checking.

Yes, that's not good at all, considering the fact that MS VB6 (5) had
been for 5 years on the market at that time. In VB6 one can easily
develop quite intricate data communication over RS-232. Just sending
the image, getting it back and comparing would work.
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.