Leandro Laporta wrote:

> I was thinking to store data on a floppy drive, that also makes no
> necessary interfase to share info on a PC!!!

  OK, you need a FDC chip and you probably don't want one of the later
ones which also contain the HDD IDE interface and you particularly don't
want one that includes RS-232 ports if you wish to keep power down.  And
you don't want an IDE interface either.

  A fairly antique board I have here uses a (large - 48-pin DIP) UMC
UM8388 FDC-only chip.  I'd look up UMC as one possible source of FDC
chips, or do as I just did and look over a few old ISA bus "paddle"
cards for other suggestions.  If you can get a chip and a full spec
sheet, you can start from there.

  Note that this is a FAQ.  When I say "you need a FDC chip", I mean
just that.  If you had some notion of doing floppy-disk data banging on
a bare PIC chip, put that right out of your mind. ;-)

  Since all FDC chips and FDDs themselves use substantial power, you
might wish to reconsider the use of Flash chips as someone else
suggested.  Not that it isn't possible with a gutsy battery; what you
ask sounds pretty much a description of the Sony Mavica.
--
  Cheers,
        Paul B.