Re: cbmlink with 3032/3040 pair

From: And Fachat <afachat_at_gmx.de>
Date: Mon, 05 Mar 2018 23:01:35 +0100
Message-ID: <161f82f2618.27e0.b4d1f2b66006003a6acd9b1a7b71c3b1@gmx.de>
I "invented" the the d67 format in Vice to store DOS 1 images with 670 
blocks free analogous   to th d64 image if that is the change you refer to. 
The d67 disks have one more sector per track in one of the speed zones.

André


Am 5. März 2018 22:07:14 schrieb Francesco Messineo 
<francesco.messineo@gmail.com>:

> On Mon, Mar 5, 2018 at 9:47 PM,  <silverdr@wfmh.org.pl> wrote:
>>
>>> On 2018-03-05, at 21:32, Francesco Messineo <francesco.messineo@gmail.com> 
>>> wrote:
>>>
>>> On Mon, Mar 5, 2018 at 8:56 PM,  <silverdr@wfmh.org.pl> wrote:
>>>>
>>>>> On 2018-03-05, at 14:14, Francesco Messineo <francesco.messineo@gmail.com> 
>>>>> wrote:
>>>>>
>>>>> This is usually not a big problem, but the disk needs a VALIDATE
>>>>> command after it has been transferred.
>>>>> Does anyone understand why it happens?
>>>>
>>>> DOS differences? DOS differs between the two. My guess is that 1541 shows 
>>>> static data stored in the directory sector, while the other one uses actual 
>>>> sector's metadata.
>>>
>>> I don't get what you mean.
>>
>> I would have to check exactly what the differences are but there are other 
>> people who I bet have them in their heads ;-) while I vaguely recall that 
>> the DOS 2.6 in 1541 is not the same as DOS 2.x in other drives. This means 
>> there may be nuance differences, and if you write a D64 (from a 1541 disk?) 
>> to another drive using DOS 2.x things like you describe may show. Once you 
>> re-VALIDATE, the drive updates the metadata to what it expects, rather than 
>> what 1541 would expect.
>
> I would expect that cbmlink just writes sectors, starting from 1,0 and
> ending to 35,16. I don't think it even knows about directory, BAM and
> so on. On a 1541, even disk id (the two characters you give at format
> time) gets changed from the .d64 image. On a 3040 they don't.
> I don't know how much "metadata" is present on a .d64 image though.
> F
>
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Received on 2018-03-05 23:08:47

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