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Configure the Atari disk drive as drive 1, this is VERY important. Turn on the Atari disk drive and insert the disk you wish to fill with the ATR image. To write an ATR image out to a real disk, press 'W' on the PC. Return to step 3 to write out more disks. Method #3: (Using ProSystem'98 and a real Atari disk drive)
- Atari Dos 2.x – Single Density
- RI Dos 2.5 – 1050 Double (Enhanced) Density
- OS 4.5X
- Kboot Disk
- SpartaDOS
Boot Sectors
On start up the first three sectors are read and they contain information on how to boot the disk. For Atari Dos Disks sector 1 has the following special bytes (The remaining bytes are just the code to load DOS.SYS) :
Data Sectors
Each data sector holds up to 125 bytes of data and the remaining three bytes hold a link to the next sector, which file the sector belongs to and how many bytes of data in the sector. The number of bytes in the sector may be less than 125 if it is the last sector in the file or it was the last sector in the file before an append operation.
VTOC
This consists of 10 special purpose bytes and 90 bytes used to hold a sector bit map to track used sectors. 720 sectors / 8 bits per byte requires 90 bytes. The bytes in the VTOC are as follows:
Boot Sectors
There is no difference in the special boot bytes on a single density Atari Dos Disk and an Enhanced Density formated disk. On start up the first three sectors are read and they contain information on how to boot the disk. For Atari Dos Disks sector 1 has the following special bytes (The remaining bytes are just the code to load DOS.SYS) :
Data Sectors
Each data sector holds up to 125 bytes of data and the remaining three bytes hold a link to the next sector, which file the sector belongs to and how many bytes of data in the sector. The number of bytes in the sector may be less than 125 if it is the last sector in the file or it was the last sector in the file before an append operation.
VTOC
This consists of 10 special purpose bytes and 90 bytes used to hold a sector bit map to track used sectors for sectors 0 through 719 on the disk (for compability reasons with Dos 2.0) Sector 1024 is used to track the remaining sectors. The bytes in the VTOC are as follows:
Boot Sectors
There is no real important difference in the special boot bytes on a MyDos disk and an Atari Dos Disk. On start up the first three sectors are read and they contain information on how to boot the disk. For MyDos Disks sector 1 has the following special bytes (The remaining bytes are just the code to load DOS.SYS) :
Data Sectors
Each data sector holds up to 125(SD)/253(DD) bytes of data and the remaining three bytes hold a link to the next sector, and the number of bytes in the sector. For small images that are Atari Dos compatable, the file# is also stored within the last three bytes. Slashes seperate single density and true double density (256 bytes sector) values. A flag byte in the directory indicates if the file is Atari Dos compatable or not.
VTOC
The first vtoc sector consists of 10 special purpose bytes and 118 bytes used to hold a sector bit map to track used sectors for sectors 0 through 943(max) on the disk. Sectors 359 and down are used to store additional sectors. For sectors 359 or less, all 256 bytes in each sector may be used on double density disks and sectors are always allocated in pairs on single density disks (excluding the first sector which is for Atari Dos compatability). The bytes in the first VTOC sector are as foll...
KBoot disks are created with my AtrUtil win 95 utility or MakeAtr Dos utility. They contain a minimally sized ATR image that contains three boot sectors and the original file. Note: Only single density disks (128 byte sectors) are supported. This allows each executable to be stored in an ATR file to itself without wasting much space. No menu disks ...
Boot Sectors
On start up the first three sectors are read and they contain information on how to boot the disk. For SpartaDos Disks sector 1 has the following special bytes:
Data Sectors
The entire sector can be used for data unlike Atari Dos. There is no link information necessary like with Atari Dos. The link information is maintained in the sector map for the file.
Bitmap
This is a simple map of every sector on the disk. One bit is used per sector so 8 bytes are available per byte. There are as many bytes allocated for the bitmap is as necessary to track every sector on the disk.
Mar 21, 2008 · Atari 810, Atari Dos 2.0s compatible: (almost universal) Single Sided, Single Density, 40 tracks per side, 18 sectors per track, 128 bytes per sector. 720 sectors, 92160 bytes total. Atari 1050, Atari Dos 2.5 compatible: Single Sided, Enhanced* Density, 40 tracks per side, 26 sectors per track, 128 bytes per sector. 1040 sectors, 133120 bytes ...
Jun 4, 2020 · I have found one "new" "disk drive" so far, not found in the list above. It's a TRS-80 model III computer! The manufacturers of the Micro-mainframe in Brenski's list above also made the 'Connection A' device that plugged in between a TRS-80 III 50-pin edge connector and the Atari to let you use the TRS-80 drives, sort of like the SIO2PC devices we use today!.
A floppy disk for your ATARI disk drive contains 40 concentric tracks, somewhat like a phonograph record. On a record, however, the tracks are actually one continuous spiral, whereas on a floppy disk, each track is a separate circle. Each track is divided into 18 sectors. To envision this, imagine cutting the disk like a pizza, with 18 equal ...
Since data on a disk is stored in files, not as tracks or sectors, ST DOS requires some disk space to chart which sectors belong to which files, what the names of the files are, and other file-related information. Some of this information is stored in the "directory," which occupies seven sectors of the disk. Another part is stored in the "File ...
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Atari it's possibly unique to drives connected via the Karin Maxi interface. If your Atari disk drive uses this mapping, it first fills track 0 on side 1, then track 0 on side 2, then seeks to track 1, again first fills track 1 / side 1, then track 1 / side 2, and so on, until it finishes with track 39 (79) / side 2. The drive switches the ...
