Re: [stella] AtariVox EEPROM file format

Subject: Re: [stella] AtariVox EEPROM file format
From: "Andrew Davie" <atari2600@xxxxxxxxxxxxx>
Date: Thu, 2 Dec 2004 10:56:45 +1100
You guys could use the fractional bit encoding technique for storing filenames. (technique explained a long time ago on [stella])
That would require log2(numberofuniquecharacters) bits for each character. So you'd need about 5.1 bits, say, for numerics and alpha.
If you have DOS filename format, that would be 11 x 5.1 = 55 bits, so 7 bytes to store a full 8.3 filename.. And it's really not that difficult to decode, either.

----- Original Message ----- From: "Paul Slocum" <paul@xxxxxxxxxxxx>
To: <stella@xxxxxxxxxxxxxxxxxx>
Sent: Thursday, December 02, 2004 10:53 AM
Subject: Re: [stella] AtariVox EEPROM file format

By using 6 bits per character and two high bits to terminate the filename,
you could free up two bytes.

But using the system we are proposing, if situation comes up where it's
critical that a program get two extra bytes (which I think is very
unlikely), you do have the option of shortening the program filename length
to get those bytes.

Also, I don't think 4 characters is too limiting for users.  If you
consider input and display challenges not to mention RAM requirements, it
may be more reasonable.  I can see two-character initials plus
two-character version number being "easy enough" to remember.  But that's
just me. :)

I think it really needs to have 8. People using my music program could realistically end up storing a lot of music files on there. It will be important to have the ability to name them descriptively.


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