How can I read a 3.5 inch floppy by 1.2 Mb?
I have tried using a call to interrupt 13h to read a sector but it gives me
an error.
How I have to do?

On Fri, 12 May 2006 22:49:46 +0200, thecaesar 
  <spamtrap@crayne.org> wrote:
> How can I read a 3.5 inch floppy by 1.2 Mb?
> I have tried using a call to interrupt 13h to read a sector but it gives me
> an error.
> How I have to do?
>
What operating system are you using?  What do you mean, read a 3.5 inch 
floppy by 1.2 Mb?  3.5 disks are usually 720k or 1.44MB.


-- 
There are two kinds of pedestrians... the quick and the dead.
		-- Lord Thomas Rober Dewar

Bill Marcum <spamtrap@crayne.org> schrieb:

> What operating system are you using?  What do you mean, read a 3.5 inch 
> floppy by 1.2 Mb?  3.5 disks are usually 720k or 1.44MB.

I have seen the following "back in the days": Someone took an 1.2 MB
5,25" floppy and copied it byte-by-byte (errm... block-by-block) to a
3,5" HD disc (1,44MB). After this, DOS reported it as 1.2 MB only (as it
was seen "logically"). This worked very good for a backup of the old
media.

Int 13h always allowed to read such media as if it were a 5,25" disc. If
the OP's BIOS does no try to be "too clever", it should still work.

Anyway, I remember at least one machine which did not like this. In this
case, going into BIOS setup and changing the disc from 1.44 MB to 1.2 MB
helped.

HTH,
   Spiro.

-- 
Spiro R. Trikaliotis                              http://cbm4win.sf.net/
http://www.trikaliotis.net/                     http://www.viceteam.org/

Thecaesar.....

i have a very old dos program that let you format and read 3.5" up to
1.7mb, may be this can work for you.

if you want to try it please let me know and i will e-mail i to you.

FRANCISCO ESTRADA

Bill Marcum <spamtrap@crayne.org> schrieb:
> What operating system are you using?  What do you mean, read a 3.5 inch
> floppy by 1.2 Mb?  3.5 disks are usually 720k or 1.44MB.

Vern seems to have some for sale at good prices if you need
one.

http://www.buerg.com/specials.htm

Jim Carlock
Post replies to the group.
-- 
Raleigh Swimming Pool Builders http://www.aquaticcreationsnc.com/

"festrada" <spamtrap@crayne.org> ha scritto nel messaggio 
news:ec5f967787c6194502cfcc2190296e0b@localhost.talkaboutprogramming.com...
> Thecaesar.....
>
> i have a very old dos program that let you format and read 3.5" up to
> 1.7mb, may be this can work for you.
>
> if you want to try it please let me know and i will e-mail i to you.
>
> FRANCISCO ESTRADA
>

I will be very glad if you can let me try this. Thanks a lot.