On Wed, Nov 15, 2017 at 10:00 PM, Spiro Trikaliotis <ml-cbmhackers@trikaliotis.net> wrote: > Hello Frank, > > * On Wed, Nov 15, 2017 at 09:29:51PM +0100 Francesco Messineo wrote: >> On Wed, Nov 15, 2017 at 9:13 PM, Spiro Trikaliotis >> <ml-cbmhackers@trikaliotis.net> wrote: > [...] >> > Is the difference between the two formats known and documented? >> >> http://www.6502.org/users/andre/petindex/drives/drives.html > > that page links to > >> http://www.6502.org/users/andre/petindex/drives/writegap.html > > The information of the latest link is known to me. Have you noticed who > gathered the information for the parts "CBM-Hackers summary" and > "CBM-Hackers discussion"? ;) yes I've noticed that, I wondered why you would ask... but just in case, I pointed it out to the rest of the list > > Ok, let's have a look. 2040 format has 670 blocks, 4040 format has 664 > blocks. The difference is 6 blocks. > > Speed zones: > 1-17: would give 17 extra blocks: negative > 18-24: would give 7 extra blocks: negative > 25-30: would give 6 extra blocks: positive > 31-35: would give 5 extra blocks: negative > > Thus, it seems that the speed zone of the tracks 25 to 30 contained an > extra block. ROM dumps are available, maybe someone can give a try disassembling the 2040 ones to confirm this? Frank Message was sent through the cbm-hackers mailing listReceived on 2017-11-15 22:00:03
Archive generated by hypermail 2.2.0.