Ooh, ooh, will you call it "carmore"?  ;-)

When you get started on that SD project, let us know.  If you are
interested in sharing then I would be interested in working on that
project with you.

-Shawn



Herbert Graf wrote:

>>Good luck with your project.  Personally I have no need for Compact Flash
>>cards at all.  If they happen to be compatible with my hard drive
>>interface,
>>that'd be a bonus, but doesn't really matter.
>>
>>I just finished soldering some parts into the board, I guess I'll use
>>wire-wrap wire to connect everything point-to-point underneath the
>>protoboard ... it usually seems to work.
>>
>>I just have 2 small questions if anyone feels like answering.
>>
>>1. Am I gonna need extra memory besides the PIC16F877's memory?
>
>
>         Almost certainly yes. If you aren't going to modify sectors on the drive
> that already contain data then you could theoretically get by without
> additional memory.
>
>         The issue is that a hard drive does things based on sectors, you can't
> write just one byte, you MUST write an entire sector (512 bytes). Therefore
> everything you do with the drive is on a sector basis. I'd certainly
> recommend either getting additional memory as a sector buffer (I use an
> EEPROM) or use a different PIC. The 18F452 has the amount of memory you
> need.
>
>
>
>>Oh, also, isn't there a memory card (sandisk or something) that has a SPI
>>interface?  Why would anyone bother with Compact Flash if that's the case?
>>Wouldn't it be WAY easier to just use the PICs SPI port than to setup the
>>IDE interface?
>
>
>         SD cards have an SPI interface. Again, transactions only happen on a sector
> by sector basis, therefore you can't just write a certain byte, you must
> write a whole sector.
>
>         As to why one would go CF? Well, in my case my project started out as a
> hard drive interface, going CF was an option I always wanted to leave open.
> On top of that CF was far cheaper then SD at the time.
>
>         These days I'd certainly go SD, in fact a project I have in mind for the
> future will do basically the same thing as my car more, but be small enough
> to fit in a pocket (guess what name it'll have... :) TTYL
>
>
> ----------------------------------
> Herbert's PIC Stuff:
> http://repatch.dyndns.org:8383/pic_stuff/
>
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