Re: floppy programming

[Joshua Jore]

Actually... that sounds like zone bit recording. As I understand it, that
sort of thing is handled by the floppy controller and isn't under the
purview of the OS. Anyhoo, what really got me on this, is I understand
there will be some new floppy drives out soon that'll do this sort of
thing by default. It allows ~33MB of data on a 1.44MB floppy. (let's just
forget how often disks bo bad here)

Pretty cool if can do it w/o changing the hardware.

Josh

___SIG___
$_='while(read+STDIN,$_,2048){$a=29;$b=73;$c=142;$t=255;@t=map{$_%16or$t^=$c^=(
$m=(11,10,116,100,11,122,20,100)[$_/16%8])&110;$t^=(72,@z=(64,72,$a^=12*($_%16
-2?0:$m&17)),$b^=$_%64?12:0,@z)[$_%8]}(16..271);if((@a=unx"C*",$_)[20]&48){$h
=5;$_=unxb24,join"",@b=map{xB8,unxb8,chr($_^$a[--$h+84])}@ARGV;s/...$/1$&/;$
d=unxV,xb25,$_;$e=256|(ord$b[4])<<9|ord$b[3];$d=$d>>8^($f=$t&($d>>12^$d>>4^
$d^$d/8))<<17,$e=$e>>8^($t&($g=($q=$e>>14&7^$e)^$q*8^$q<<6))<<9,$_=$t[$_]^
(($h>>=8)+=$f+(~$g&$t))for@a[128..$#a]}print+x"C*",@a}';s/x/pack+/g;eval

On Sun, 18 Mar 2001, Leandro Bernsmuller wrote:

>
> Hi,
>
> some body know if exist or is possible to do one
> driver
> to makes floppy drive use some type of "balanced" bits
> distribution?
> The idea is simple: format a disk doing inner tracks
> with less bits than
> in external tracks.
> Maybe is better think in sectors and not bits
> banlancing?
>
> I want opinions about the idea, pleace.
>
> Where can I find information about floppy drivers
> programming, DMA setup,...?
>
> Thanks,
>
> Leandro
>
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