First stop, create that image (with DOS installed on it – all files). I showed you how to create a 720K disk image for use in the Atari 8 bit emulators in this blog entry. While DOS XL is a strong DOS, it’s not my favorite. The disk based Mac/65 comes with OSS (FTE) DOS XL. Also use CHKDSK to verify the sector size and total capacity: Now you can use DIR to see the contents, which should be empty, and see the number of free sectors which will be slightly less than the 1440. Then use W rite Directory to “format” the disk. This should show a sector count of 1440 and 512 BPS (bytes per sector), with a total of 737,280 bytes. When creating the image in Atari800MacX, you need to choose Custom and set the sector count to 1440 and sector size to 512 bytes.Īfterward using SpartaDOS X Format utility, select the drive number, set the density to “DD 512”, tracks to 80 DS (double sided). Also use CHKDSK to verify the sector size and total capacity: 720K Configuration This should show a sector count of 1440 and 256 BPS (bytes per sector), with a total of 368,640 bytes. This is more efficient for many small files.Īfterward using SpartaDOS X Format utility, select the drive number, set the density to “DD 512”, tracks to 40 DS (double sided). When creating the image in Atari800MacX, you need to choose Custom and set the sector count to 1440 and sector size to 256 bytes. This should show a sector count of 720 and 512 BPS (bytes per sector), with a total of 368,640 bytes. When creating the image in Atari800MacX, you need to choose Custom and set the sector count to 720 and sector size to 512 bytes.Īfterward using SpartaDOS X Format utility, select the drive number, set the density to “DD 512”, tracks to 40 DS (double sided). Larger sectors will consume more space for many small files, but will work out better for a few large files. You need only decide which sector size you want based on needed efficiency. There are two formats you can use for 360K images, and both will work. Also use CHKDSK to verify the sector size and total capacity: 360K Configuration Now you can use DIR to see the contents, which should be empty, and see the number of free sectors which will be slightly less than the 720. This should show a sector count of 720 and 256 BPS (bytes per sector), with a total of 184,320 bytes. When creating the image in Atari800MacX, you can use the standard double density option, or choose Custom and set the sector count to 720 and sector size to 256 bytes.Īfterward using SpartaDOS X Format utility, select the drive number, set the density to “DOUBLE”, tracks to 40 SS (single sided). This should show a sector count of 720 and 128 BPS (bytes per sector), with a total of 92,160 bytes. When creating the image in Atari800MacX, you can use the standard single density option, or choose Custom and set the sector count to 720 and sector size to 128 bytes.Īfterward using SpartaDOS X Format utility, select the drive number, set the density to “SINGLE”, tracks to 40 SS (single sided). I’ll be referencing the Atari800MacX create new disk image utility, accessible from the Media menu: In this post, I’m describing the required format specifications to achieve a fully compatible ATR image that is sized at 720K, as well as 360K, 180K, and 90K. I also found a 360K format I was using that was also incompatible outside the emulator. Over the years I found that the specific sector size and configuration is problematic for some utilities that manipulate/use ATR’s (outside of the emulator). In a previous post here ( ) I posted about creating a 720K ATR disk image with SpartaDOS on it. 720K was a size never achieved with stock hardware throughout Atari’s existence. By comparison, a double sided single density 3.5″ floppy is 720K. It’s still actively maintained today!Ītari started out at 90K disks (single sided single density 5.25″ floppy). It also supports sub directories and timestamps. It received updates to allow hard drive access and boasted one of the best memory footprints, which is critical for these old 48K to 128K machines. It was released on disk and eventually on cartridge too. SpartaDOS is great MS-DOS like DOS (Disk Operating System) for the Atari 8 bit line of computers.
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