Re: upgrading CBM-3040?

True original commodore drive source (and more) is available here:https://github.com/mist64/cbmsrc

Steve

      From: Francesco Messineo <francesco.messineo@gmail.com>
 To: cbm-hackers@musoftware.de 
 Sent: Wednesday, November 15, 2017 4:05 PM
 Subject: Re: upgrading CBM-3040?
   
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

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