>
> Yes, I can sell you such a programmer (see below) *BUT* as you
> had problems
> with two designs that most people seem to be using without problems I
> strongly suggest you try to get those working, or at least find out where
> you went wrong. Otherwise you might run into the same problems again and
> declare yet another programmer design a failure.


This is not necessarily the case.

Both the JDM and the El Cheapo are sensitive the characteristics of the
parallel ports which are not always true. For example, the El Cheapo
designer admits at (http://www.myke.com/elcheapo.htm) that it did not work
with his built in ports and he had to buy an after market PCI card. The JDM
also put some restriction on the RS232 port (see first paragraph at
http://www.jdm.homepage.dk/newpic.htm) since it derives the power from the
RS232 signals.

A straight forward design such as P16PRO
(http://www.picallw.com/pictures/p16pro.gif) that interfaces with the
computer using standard I/O buffers is much more likely to work with all
computers.

Sometimes saving a 50c component ends up very expensive.

Tal




> You might want to know that the 16f628 and 16f877 can be
> programmed in a way
> (called LVP) that sacrifices one IO pin, but makes the
> rpogramming hardware
> somewhat simpler.
>
> You might also consider whether you need a programmer at all. The
> 16f877 can
> be programmed with self-programming software (called a bootloader). Once
> that is done you connect a serial port (use a max232 for reliability) and
> off you go. There are plenty (free) bootloader software and designs
> available. If you don't have the programmer (or a friend with a
> programmer)
> to get the bootloader code in in can sell you a pre-programmed 16f877. I'm
> sure there are lots of other people who can do the same.
>
> You might have found out that the 16f84a is the PIC that is the easiest to
> buy from local electronics shops. When you can't buy 16f628 or 16f877
> locally I sell them. www.phanderson.com is also a good source, but I
> understand that he is closed for the summer. You can also try
> www.dontronics.com
>
> <AD>
> flash PIC programmer kit, see http://www.voti.nl/wisp628
> (pages still under construction)
>
> BTW I sell the kit, but the design and software are free, so you can build
> your own if you want. You need a pogrammed 16f628, but again the
> software is
> free - just find someone to program it for you.
>
> If I recall correctly Sweden is EC but not Euro, in that case the
> price for
> the kit is US$20.93 + US$7.00 S/H (both including ST)
>
> note: the current PC software does NOT work under an NT-derived Windows
> unless a driver is installed to enable direct serial port access.
> </AD>
>
> Wouter van Ooijen
> --
> Van Ooijen Technische Informatica: http://www.voti.nl
> Jal compiler, Wisp programmer, WLoader bootloader, PICs kopen
>
> --
> http://www.piclist.com#nomail Going offline? Don't AutoReply us!
> email listserv@mitvma.mit.edu with SET PICList DIGEST in the body
>
>

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