Re: Looking for a simple write-only file system

From: David Wood (
Date: 2003-06-20 05:41:18

Is ISO9660 too bloated?  It seems to me that what you're setting up is media
that's intended to be written once and read many times (WORM), not
write-only, which is never intended to be read again (WORN, a joke from the
old 8bit atari days).  Anyway, the ISOfs I suspect is fairly simple aside
from its relatively large pointers.  Have a look.  There's even space in the
header for a generous-sized bootblock ;-)  

 . o O ( mkisofs games/vic20/*.rom >vic20 )


On Thu, 19 Jun 2003, Marko [iso-8859-1] Mäkelä wrote:

> Good news everyone: the prototype of the combined 32 kB SRAM and 4 MB Flash ROM
> cartridge for the VIC-20 works.  In principle, it's the same design that we
> already had two years ago, but there have been various practical problems.
> This prototype uses three chips: 62256 SRAM, Am29F032B flash and Lattice 1016
> programmable logic.
> The menu software I wrote over two years ago supports one directory only.
> I thought that it'd be nice to have subdirectories, since it is a bit hard
> to keep track of 4 megabytes of compressed data.  I have an idea how the
> subdirectories could be implemented without wasting a lot of space, but I'd
> also look for existing solutions.
> The Am29F032B has 64-kilobyte sectors, but I wouldn't be making use of the
> "sector erase" feature.  With a 38,400 bps C2N232 connection, the entire
> flash can be reprogrammed in less than 20 minutes.
> I'd interleave the directory entries with the data (like in the archiving
> programs lha and tar) and provide each entry with links to the next and
> previous entry.  The data would be aligned on a byte boundary.  The last
> entry would have a link $ffffff, so that new files can be appended without
> reprogramming the entire flash.  Also files could be deleted by programming
> some "file type" bits to all zero.
> Does anyone have some write-only file system code that I could use?  I'm
> going to release the design and all program code under the GNU General
> Public License.  Assembled and tested devices will hopefully be available
> by September or October for 50 to 60 EUR a piece.
> 	Marko
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