Atari ST image info...

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JimDrew
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Atari ST image info...

Postby JimDrew » Wed Apr 09, 2014 11:19 pm

How are single sided disks handled compared to double sided disks for .ST and .MSA images? I can see that double-sided disks are sequential starting with the bottom head and then the top head. What about single sided disks?

It turns out that the data separator I made for emulating PAULA's disk controller works exceptionally well for Atari ST/IBM PC format. It will need a bit of tweaking to handle those odd WD1772 things, but it works perfect for decoding sectors so I can generate .ST and .MSA images.
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Re: Atari ST image info...

Postby Hippy Dave » Thu Apr 10, 2014 12:13 am

JimDrew wrote:How are single sided disks handled compared to double sided disks for .ST and .MSA images? I can see that double-sided disks are sequential starting with the bottom head and then the top head. What about single sided disks?

It turns out that the data separator I made for emulating PAULA's disk controller works exceptionally well for Atari ST/IBM PC format. It will need a bit of tweaking to handle those odd WD1772 things, but it works perfect for decoding sectors so I can generate .ST and .MSA images.

A single sided drive has the head on the bottom (I checked). Combined the the info you just gave, you can draw further conclusions

JimDrew
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Re: Atari ST image info...

Postby JimDrew » Thu Apr 10, 2014 1:22 am

I know where the head is, I just want to verify that a single sided disk is laid out sequentially, ignoring the top side, but not skipping any space in the file.
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Re: Atari ST image info...

Postby AtariZoll » Thu Apr 10, 2014 5:43 am

Yes, the order is simply from track 0 to last track. Only bare sector data contents in row. That no gaps in case of SS is visible by image sizes too.
Drawback of ST (and DSK + some others likely) format is that you don't have disk geometry info. May read it from bootsector - if it is there. Lot of games have custom bootsector, but can image in ST format.
MSA adds header with geometry info + optional simple data packing. Otherwise, sector, side order is same as in ST.
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JimDrew
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Re: Atari ST image info...

Postby JimDrew » Thu Apr 10, 2014 6:07 am

Perfect! Thanks for the info.
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Brume
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Re: Atari ST image info...

Postby Brume » Tue Jul 22, 2014 11:49 am

Jim: have you made progress on the ST/MSA support? I have a bunch of 700 disks (non protected) to archive.

Until now, I used FastCopy on the STE, but I wonder if I can use SCP on the PC to do the job faster?

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DrCoolZic
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Re: Atari ST image info...

Postby DrCoolZic » Tue Jul 22, 2014 6:50 pm

This is also on my todo list for Aufit :)

JimDrew
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Re: Atari ST image info...

Postby JimDrew » Thu Jul 24, 2014 4:05 am

I have done nothing more with any formats... but I am going to start on C64 format this weekend while at CommVex, and since i will be in the code, it will finish the PC, Atari ST, and others systems that use the same format.
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Re: Atari ST image info...

Postby Jeff_HxC2001 » Fri Jul 25, 2014 9:49 pm

Brume wrote:Jim: have you made progress on the ST/MSA support? I have a bunch of 700 disks (non protected) to archive.

Until now, I used FastCopy on the STE, but I wonder if I can use SCP on the PC to do the job faster?


Just batch convert your ST/MSA files to SCP with the HxC software :wink:


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