On Mon, 7 Dec 1998, Adriano Camargo Rodrigues da Cunha wrote:
>
> > > <>512 bytes for sector size? This really exists??
> > I made longer sectors on a floppy once, as an attempt to create a copy
> > protection. They were read without problems by the 8250, but on turbo R,
> > only the first 512 bytes were read.
> > The difference is in the diskROM. This has probably something to do with
> > the way the drive controller (FDC) works. Someone from NOP told me that
> > programming TraxPlayer for turbo R was difficult because it didn't have an
> > "end of sector indicator bit", like the 8250 and many other models have.
> > I have never seen a device with sectors other than 512 bytes in length. I
> > don't think we should consider supporting it.
>
> Brazilian FDC, controlled by ports D0-D7, allow using any
> sectors with any size. There is a program, Pro Kit Zapper, that allows you
> formatting your disk using sectors with different sizes for any disk
> track [sorry, but I don't know what is the chip of brazilian FDCs].
That's not true. This FDC only allows sector sizes of 128, 256, 512, 1024
and 2048 bytes. I attempted to create a sector that fills out an entire
track, and while reading, the disk-drive couldn't read any byte from that
track! It returns some error code like "sector not found".
I think this limitation is not due to FDC, but is due to all disk-drives
chip capabilities. Can someone try this using a FDC accessed through
memory addresses?
Greetings from Brazil!
--------------------------------------------------------------
Marco Antonio Simon Dal Poz http://www.lsi.usp.br/~mdalpoz
[EMAIL PROTECTED] "The measure of success is the knowledge"
/"\
\ /� CAMPANHA DA FITA ASCII - CONTRA MAIL HTML
X�� ASCII RIBBON CAMPAIGN - AGAINST HTML MAIL
/ \
****
MSX Mailinglist. To unsubscribe, send an email to [EMAIL PROTECTED] and put
in the body (not subject) "unsubscribe msx [EMAIL PROTECTED]" (without the
quotes :-) Problems? contact [EMAIL PROTECTED] (www.stack.nl/~wiebe/mailinglist/)
****
