From: Spiro Trikaliotis (ml-cbmhackers_at_trikaliotis.net)
Date: 2005-05-06 10:48:38
Hello Nicolas,
* On Fri, May 06, 2005 at 09:42:01AM +0200 Nicolas Welte wrote:
> This is very interesting! Did you actually disassemble all the format
> and block write routine versions to gain above values? good work!
Well, not completely. I analyzed the 2031, 1540, and different 1541
version. Anyway, for the 4040, I relied on knowledge I found on the net
(and in some books).
> What about the sync length of different ROM versions? Are they the
> same or do they also differ?
The 2031 up to the newest 1571 all use 5 byte for the SYNC length.
Again, for the 4040, I did not analyze this.
> Interpreting your result, the disks can be damaged when you write to a
> disk that has been formatted on a short-gap drive with a long-gap
> drive, because the drive would not overwrite the old sync completely,
> but start rewriting it too late, because it waits for more gap bytes.
> Is that correct?
Yes, exactly. Have a look at the other posting some minutes ago, where I
analyzed this in more detail.
> Hmm, now I'm curious what the 2040 does, with the extra sector on
> tracks 18-24 (670 blocks free).
That firmware is not available on funet. :-(
Regards,
Spiro.
--
Spiro R. Trikaliotis
http://www.trikaliotis.net/
http://cbm4win.sf.net/
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