[continued from previous message]

- OSS published a patch to convert version 2.30 to version 2.30p in
their Spring 1984 Newsletter. OSS then published a corrected version
of the 2.30p patch in their Fall 1986 Newsletter. See:
http://preview.tinyurl.com/o6cn9mm
- OSS/Indus DOS XL 2.35 is OSS DOS XL 2.30 plus GTSYNC.COM, the
Indus GT Synchromesh Engager. Copyright (C)(P) 1984, Indus Systems.
Two versions of DOS XL 2.35 were released by Indus:
- OSS DOS XL - ATARI version 2.35I1 Copyright (C) 1983 OSS,Inc.
- GTSYNC.COM VID: 01.02\01.01\01.01\01.21\01.21.
- Supports Synchromesh 38.4 kbit/s on:
Indus GT, LDW Super 2000, CA-2001
- OSS DOS XL - ATARI version 2.35I2 Copyright (C) 1983 OSS,Inc.
- GTSYNC.COM VID: 01.10\01.01\01.10\01.30\01.30.
- Supports Synchromesh 68.2 kbit/s on:
Indus GT, LDW Super 2000, XFD601, XFD602
- DOS XL 2.35I1 and DOS 2.35I2 were often (always?) distributed with
RAM130.COM, written by Joseph Segura in 1985: a 64KiB RAMdisk for
the 130XE. Synchromesh (GTSYNC.COM) must be disabled in order to
use RAM130 -- effectively, RAM130 is for DOS XL 2.30.
- "DOS XL 2.35L" is described in the manuals for the LDW Super 2000 and
CA-2001 disk drives. However, original disks shipped with these drives
are reported to be identical to DOS XL 2.35I1 (including RAM130.COM).
- Warp Speed DOS XL, including under cartridge, under ROM and Axlon RAM
versions, was distributed by Happy Computers, Inc. for use with Happy
810 Enhancement (Rev 7 capable units) or Happy 1050 Enhancement
- Shipped with: Amdek AMDC-II, Astra 1620 (earlier units), CA-2001,
Indus GT, LDW Super 2000, Percom RFD40-S1, Percom RFD40-S2,
Percom AT88-S1, Percom AT88-S2, Percom AT88-S1PD, Percom AT88-SPD,
BASIC A+, MAC/65
- Rights purchased from OSS by ICD in January 1988
(but ICD discontinued DOS XL in favor of their own SpartaDOS)
- Rights purchased from ICD by Fine Tooned Engineering (FTe) in 1993
- FTe DOS XL 2.30 (including 2.30C and 2.30X) released on 6/22/94.
They are identical to the OSS releases of the same versions.

K-DOS By K-Byte Copyright 1981 Kay Enterprises Co. ---------------------------------------------------
- By Kay Enterprises Co. (John Mathies, K-Byte general manager)
(the makers of K-Razy Shoot-Out and K-Razy Kritters)
- Disk drive types supported: Atari 810 (& compatible)
- Disk allocation/filesystem: Atari DOS 2.0 Single Density
- Command line driven
- Memory resident

OS/A+ version 4.0 (1982 - MC is still looking for a copy of this version)
OSS OS/A+ - ATARI version 4.10 Copyright (C) 1982 OSS --------------------------------
- Port of Apple DOS for the Apple II (which was developed by Paul Laughton for
Shepardson Microsystems, Inc. (SMI), predecessor to OSS)
- Requires minimum of 32KiB RAM to run
- Disk allocation/filesystem:
- Random access to data files
- Disks with 128, 256, or 512 bytes per sector
- Drives ranging in storage size from 128KiB to 32MiB
- Shipped with: Percom RFD44-S1, Percom RFD44-S2
- Also sold by Software Publishers/SWP for use with ATR8000, 1982-1983

DOS-MOD (1983)
(c) 1984 R.K.Bennett TOP-DOS v1.1
(c) 1984 R.K.Bennett TOP-DOS v1.20
TOP-DOS 1.4 (1984)
TOP-DOS 1.5 (c) 1985 R.K.Bennett
TOP-DOS 1.5a (c) 1985 R.K.Bennett
TOP DOS 1.5 Plus (1986)
TOP DOS Professional (1986)
---------------------------
- Developed by R.K. Bennett for Sunny Software / Eclipse Software
- Sold commercially by Sunny Software (original DOS-MOD release) or
Eclipse Software (later DOS-MOD release and all releases of TOP-DOS)
- DOS-MOD: Enhances Atari DOS 2.0S
o Menu-driven, Full screen use
o Command files
o Expanded wildcard capability
o Fixes 11 bugs in DOS 2.0S
o Single and Double Density versions
o DD version supports HELLO command file option on startup
o DD version supports cartridge-bypass feature on startup
o DD version can also run in the SD mode
- TOP-DOS: Standalone product, includes all the features of DOS-MOD
o Uses Atari DOS 2 single and double density filesystems, or
proprietary variations on the DOS 2 filesystem. The TOP-DOS unique
filesystem is not supported by any other DOS for the Atari.
o 1 to 8 disk drives
o Alphabetization and compression of the disk directory
o Drive support: 5.25": SD, DD, DSDD. 8": DD
o Specify the number of sectors desired, up to 944 per side in single
density and up to 1968 in double density
o Reformat only the VTOC, on a previously formatted disk
o RAMdisk support: Axlon and Mosaic
- TOP-DOS 1.5:
o RAMdisk support: 130XE Extended
o 1050 Enhanced Density Support
o "WISE" Density Control
o High Speed Data Transfer (Happy Warp Speed)
o Improved Status Display
o Hex-Decimal Conversion
o 90KiB buffer for one-pass disk duplication
o Four-level command file nesting
o Ad: Antic v4n9 Jan86 p.44
o Shipped with: Astra "Big D" (later units), Astra The "One"
o Also distributed by Happy Computers, Inc., 1986- for use with Happy 810
Enhancement (Rev 7 capable units) or Happy 1050 Enhancement
- TOP DOS 1.5 Plus:
o Allows multiple RAM disks, SD or DD
o Accesses Atari DOS 2.5 files
o Supports other RAM boards
o New sector number display and tone control
o Better warp speed and group autorun control
o BASIC enable/disable for XE/XL with built-in BASIC
- TOP DOS Professional:
o Up to 16MiB disk capacity
o Sub-directories
o Sector read, write & compare
o File compare
- 1.5 Plus / Professional ad: Antic v5n2 Jun86 p.27
- Apparently released into the public domain, approximately 2005

MYDOS
-----
MYDOS 3.05 [reported to exist]
MYDOS 3.07 -- copyright 1983,WORDMARK (August 16, 1983)
MYDOS 3.08 -- copyright 1983,WORDMARK
MYDOS 3.12 -- copyright 1983,WORDMARK ATR8000 RS232 Version, by C. Marslett MYDOS 3.09 [reported to exist]
MYDOS 3.13 (August 8, 1984)
MYDOS 3.010 - copyright 1983,WORDMARK
MYDOS 3.011 - copyright 1984,WORDMARK
MYDOS 3.16 [reported to exist]
MYDOS 3.012 - copyright 1984,WORDMARK
MYDOS 3.013 - copyright 1984,WORDMARK
MYDOS 3.18 -- copyright 1984,WORDMARK ATR8000 RS232 Version, by C. Marslett MYDOS 3.014 - copyright 1985,WORDMARK (February 18, 1985)
MYDOS 3.19 -- copyright 1985,WORDMARK ATR8000 RS232 Version, by C. Marslett MYDOS 3.015 [reported to exist]
MYDOS 3.016 - copyright 1985,WORDMARK
MYDOS 3.016AX copyright 1985,WORDMARK Axlon RAMdisk version
MYDOS 3.116 - copyright 1985,WORDMARK ATR8000 RS232 Version, by C. Marslett MYDOS 4.0 --- copyright 1985,WORDMARK
MYDOS 4.2 --- copyright 1985,WORDMARK
MYDOS 4.2C -- copyright 1985,WORDMARK
MYDOS 4.3A (October 21, 1986)
MYDOS 4.3B -- copyright 1986,WORDMARK
MYDOS 4.50 -- Copyright 1988,WORDMARK (11/28/88 freeware, from Bob Puff)
MYDOS 4.50T - Copyright 1988,WORDMARK
MYDOS 4.51 -- copyright 1989,WORDMARK (6/14/89)
MyDOS 4.53/3 and 4.53/4 (David R. Eichel rel.ver.1/1/90)
MyDOS 4.55 Beta (Lee Barnes March 17, 2003)
-----------------------
- Primarily developed by Charles W. Marslett
- Menu driven, modeled after Atari DOS 2
- Uses Atari DOS 2 single and double density file systems, extended with
support for larger capacity diskettes
- First Atari DOS to support dynamic density changes (user-initiated, but
without rebooting the system).
- Earlier versions were sold commercially; 4.5x versions shareware/freeware
- Versions 3.x sold by SWP for use with the ATR8000:
- 3.0x versions are the standard releases
- 3.1x versions have an integrated R: handler for the ATR8000 serial port
- Sold by SWP in disk-side or system disk builder pairs. Known version-
pairs include: 3.08/3.12, 3.09/3.13, 3.011/3.16, 3.013/3.18, 3.014/3.19
- 3.2x versions also exist, for use with the ATR8500 which never shipped
- Versions after 3.08/3.12 include support for subdirectories
- RDOS 800 (early name ROMDOS) is MYDOS 3.0 but can occupy less user RAM.
- Revisions: 0.0, 0.1 (1984), 0.11, 0.12, 0.14. Versions:
- Can reside in the 4KiB unused memory address space in the 400/800
(49152-53247 or $C000-$CFFF) for permanent availability on ROM
(i.e., Newell Ramrod personality board or CDY Omnimon! board)
- Can reside in OSS supercartridge banked RAM address space
- Can reside in standard RAM
- 0.14 additionally can reside under XL/XE built-in BASIC
- OMNIDOS is Wordmark ROMDOS/RDOS and CDY Omniview on one 8KiB chip for
Newell Ramrod personality board or CDY Omnimon! board
- MYDOS 3.016 shipped with: Astra "Big D" (earlier units)
- Versions 4.x include support for high capacity drives (hard drives), up
to 16MiB per partition.
- Versions 4.x have full read compatibility with the Atari DOS 2.5 format,
but will only write to the first 720 sectors of the disk. (MYDOS has its
own format for enhanced density disks that allows full access.)
- Versions 4.x shipped with RS-232 driver for the ATR8000
- MYDOS 4.x shipped with: SupraDrive, BTL Hard Disk System,
TOMS 720 (on ROM), Newell 256KXL
- Version 4.3 adds 'S' command to set the RAMdisk drive number and adds 'V'
to turn on and off write-verify.
- Versions 4.5x include:
- ATARI850.AUT - for loading the R: handler from the 850 interface ROM
- ATR232.AUT - RS-232 driver for the ATR8000
- ATR232HD.AUT - RS-232 driver for ATR8000 with ATR hard disk interface
- Bob Puff/Computer Software Services offers version 4.50 (first freeware
release): http://www.nleaudio.com/css/files/MYDOS45M.ARC
- Charles Marslett/Wordmark Systems makes version 4.51 source code available:
http://www.wordmark.org/mydos.html
- MyDOS 4.53 was released by David R. Eichel on 1/1/90, making minor changes
from the released 4.50 and 4.51 source code.
- Supports multiple AUTORUNs at boot up (*.AR0 through *.AR9).
(Support for the traditional AUTORUN.SYS is removed.)
- Fixes broken Axlon RAMdisk support
- Version 4.53/3 gives 3 character file length/free sector count instead
of the normal (for MyDOS) 4.
- Version 4.53/4 is the same as 4.53/3, but uses a minimum of four
characters in the sector count just like most versions of MyDOS.
- More recent work on MyDOS by Lee Barnes is available, along with many
earlier MYDOS versions, from Mathy van Nisselroy's MyDOS page:
http://www.mathyvannisselroy.nl/mydos.htm

DOS 4.0 (1984)
--------------
- Developed at Atari. Known before its release as "QDOS"
- Copyright 1984 Atari, published 1984 by Antic Magazine
- Copyright 1984 Michael Barall, published 1984 by Antic Magazine
- Supports "a variety of different disk drives, single density or double
density, and single-sided or double-sided"
- Disk drive types supported, by bus connection:
1) internal (1450XLD)
2) external (parallel bus)
3) external (serial bus)
- Filesystem could support disks up to 384KiB (drac030, AA Forums 2010.07.21)
- Filesystem uses logical sector size of 1.5KiB
(drac030, AA Forums 2010.07.21)
- Supports 8 physical drives (1-8), and 10 logical drives (D0:-D9:)
- DOS 2 to DOS 4 Conversion Program
- DOS 3 to DOS 4 Conversion Program

SmartDOS Beta Test Version 1.5R (C)1984 John Chenoweth & Ron Bieber
SmartDOS (C)1984 John Chenoweth & Ron Bieber
distributed by Rana Systems 6.1D
SmartDOS (C)1984 John Chenoweth & Ron Bieber
for The Programmer's Workshop 8.2D
--------------------
- Disk drive types supported:
1) Atari 810 (& compatible)
2) SSDD 5.25" Single-Sided, Double Density
- Disk allocation/filesystems:
1) Atari DOS 2.0 Single Density
2) Atari DOS 2.0 Double Density
- First Atari DOS to be "Density Smart" (changing between the disk drive's
density settings dynamically, in accordance with the format density of the
inserted media, without user-intervention)
- Menu additions that allow sector copying, drive speed checking, bad sector
testing, write verify on/off, and drive reconfiguration
- Original Master diskette, shipped with earlier SmartDOS versions, contains:
DOS.SYS, DUP.SYS, DEFAULT, ARCREATE.BAS, RS232.ARx, AUTORUN.SYS
- DOS.SYS is Atari DOS 2.0S version under license from Atari.
- Disk is used only to create a Working Master diskette.
- Working Master diskette, created using the AUTORUN.SYS file on the Original
Master diskette, or shipped with later SmartDOS versions, contains:
DOS.SYS, DUP.SYS, DEFAULT, ARCREATE.BAS, RS232.ARx
- DOS.SYS is proprietary SmartDOS version.
- ARCREATE.BAS is used to create a file that will autorun a BASIC file upon
system boot.
- Multiple autoload file support, for files named *.AR1 through *.AR9
- RS232.ARx loads the R: handler from the 850 interface ROM.
- Should be renamed RS232.AR1 to be autorun by SmartDOS
- Supports both warm and cold re-boots of the system
- Shipped with: Rana 1000, Astra 1620 (later units), Astra 2001, Astra 1001

Mach DOS v2.1 XL (c) 1984 stace
Mach DOS v2.6 XL (c) 1984 stace
MachDOS v3.7a (c) 1985 stace
--------------------
- Released directly into the public domain by H. V. Stacey (stace)
- Disk drive types supported:
1) Atari 810 (& compatible)
2) SSDD 5.25" Single-Sided, Double Density
3) DSDD 5.25" Double-Sided, Double Density
- Disk allocation/filesystems:
1) Atari DOS 2.0 Single Density
2) Atari DOS 2.0 Double Density
3) DOS 2.0 Double-Sided, Double density
- Intelligent detection and support for double density and double-sided disks
- v.3.7a RAMdisk types supported: 130XE, Axlon, Mosaic, Intec boards as well
as the 800+ and MACE modifications
- RAMdisk is D4:
- Mach File disk image files
- [SELECT] key toggles menu on-screen

SpartaDOS Version 1.1 Copyright (C) 1984 by ICD, INC.
SpartaDOS Version 2.3b D Copyright (C) 1985 by ICD, INC.
SpartaDOS Version 2.3b C Copyright (C) 1985 by ICD, INC.
SpartaDOS Ver 2.3e 1-Nov-85 D Copyright (C) 1985 by ICD, INC.
SpartaDOS Ver 2.3e 1-Nov-85 C Copyright (C) 1985 by ICD, INC.
SpartaDOS Ver 3.2c 30-Jan-86 Copyright (C) 1986 by ICD, Inc.
SpartaDOS Ver 3.2d 17-Feb-86 Copyright (C) 1986 by ICD, Inc.
SpartaDOS Ver 3.2f 25-Feb-94 Copyright (C) 1994 by FTe
SpartaDOS Ver 3.2g 04-Jun-94 Copyright (C) 1994 by FTe
SpartaDOS Ver 3.2gx 04-Jun-94 Copyright (C) 1994 by FTe ---------------------------------------------------------------
- Originally developed by Mike Gustafson of Spartan Software of Minnesota/
ICD, and shipped alongside US Doubler as ICD's first two products in 1984.
- Often included with US Doubler
- Version 1.1:
o Requires 24KiB RAM 400/800/XL/XE
o Supports 5.25" and 8" floppy disk drives, single or double sided, single
or double density (35, 40, 77, or 80 tracks)
o Supports 4 disk drives
o SPCOPY command for single or dual drive transfers between SpartaDOS
and/or Atari DOS 2 compatible formats
o Available AT_RS232 R: handler for ATR8000 support
o Available RDAXLON command sets up a 112KiB Axlon RAMdisk
o Disk allocation/filesystem: SpartaDOS File System (SDFS) version 1.1
o 128 or 256 bytes/sector
o Four sector types:
- Bit maps. Contain a list of bits corresponding to all sectors on
the disk, indicating whether each sector is currently in use.
- Sectors 1-3 are boot sectors, containing the boot record accessed
by the Atari OS at system power-up. (OS reads 128 bytes/sector)
- Sector maps. Contain a list of data sectors making up a file,
plus links to previous and next sector maps.
- Directory data sectors. Contain a directory file, consisting of
information about each file in the director, and information about
any subdirectories
- User data sectors
o Subdirectories supported, up to 128 files per directory
o Time/date stamping
o Disks have volume names
o Up to 16MiB per drive
- Several flavors of Version 1.1:
o SPEED.DOS - RAM resident full powered DOS; UltraSpeed supported
o STANDARD.DOS - RAM resident full DOS; no UltraSpeed support
o NOCP.DOS - No command processor; tries to load an AUTORUN.SYS file
before it passes control onto the cartridge; UltraSpeed
supported
o NOWRITE.DOS - Can only read from disk, very low memory usage,
UltraSpeed supported; useful as a game loader
- Changes for Version 2.3, packaged as the SpartaDOS Construction Set:
o Requires a 64KiB XL/XE
o An enhanced Atari DOS 2 handler: Can read, write, and run Atari DOS 2
formatted diskettes in both single and double density
o Supports 8 disk drives
o UltraSpeed High Speed built in
o 14 new internal command processor commands
o 8 new XIO functions
o Extra 4KiB program area
o RDBASIC sets up an 8KiB RAMdisk on any XL/XE computer
o RD130 sets up a 64KiB RAMdisk on a 128K XL/XE computer
o Disk allocation/filesystem: SpartaDOS File System (SDFS) version 2.0
- Generally compatible with SDFS version 1.1, but some changes to data
contained in boot sectors mean that SDFS 1.1 disks should be used
with DOS versions supporting SDFS 2.0 only with caution.
- Two flavors of 2.3 (2.3b, 2.3e) versions:
o XD type (XD23B.DOS or XD23E.DOS) is the full powered DOS; recognizes
the STARTUP.BAT file when booted and priority is given to DOS (rather
than the cartridge).
o XC version (XC23B.DOS or XC23E.DOS) is the same as XD versions except
AUTORUN.SYS is recognized when booted and control priority is given to
the cartridge.
- Changes for Version 3.2, packaged as the SpartaDOS Construction Set:
o Better time and date support (internal TD, TIME, DATE commands)
o Internal R-Time 8 interface
o Internal JIFFY clock interface (for non-R-Time 8 users)
o Internal 32 character keyboard buffer (and KEY command)
o Automatic mini-buffer system for fast byte PUT and GET functions
o New vectors added for machine language support
o Control returned to DOS if DOS was active during RESET
o Supports both a STARTUP.BAT and an AUTORUN.SYS file
o Compatible with BASIC XE, 1200XLs and many modified Operating Systems
o BASIC ON/OFF command operation from within a batch file (not end only)
o NOISY I/O flag recognized
o Support for the Supra Hard Disk Interface
o All command entry in upper or lower case
o Full read capability for Atari DOS 2.5 type enhanced density format
- Several notable patches to SpartaDOS 3.2d have been developed, such as:
o Bob Woolley created a patch utility program that will modify SpartaDOS
3.2d to support the XF551's high speed I/O
o "SpartaDOS 3.2z" was the result of a patch developed and distributed by
Computer Software Services (CSS, Bob Puff) for SpartaDOS 3.2d to allow
SpartaDOS to support the CSS Multiplexer (MUX).
See: http://nleaudio.com/css/products/Mux_docs.htm
- Rights purchased from ICD by Fine Tooned Engineering (FTe, Mike Hohman) in
1993 (November?).
- FTe SpartaDOS 3.2g changes included:
o Support for a ninth drive, D9:
o D: means current working drive, instead of D1:
o Full support for upper/lower case
o CWD, CREDIR, DELDIR commands changed to CD, MD, RD
o TDLINE Y2K bug fixed
o 1200XL function keys work properly
SpartaDOS 3.2gx differs only in that it locates the disk buffers under the
OS to save RAM. 3.2gx is intended for use in systems that include a PBI
device (MIO, Black Box); it is not compatible with BASIC XE nor any other
programs using RAM under the OS.
- Many disk-based SpartaDOS versions are available for download from
Thunderdome, kept by SysOp Fox-1: http://mixinc.net/atari/a8men.htm
Direct link: http://mixinc.net/atari/download_a8/sdsys.htm#top

SuperDOS V2.9 (C) 1986 Paul Nicholls
SuperDOS V4.3E(C) 1986 Paul Nicholls
SuperDOS V4.3T(C) 1986 Paul Nicholls
SuperDOS V4.4 (C) 1988 Paul Nicholls
SuperDOS V5.0 (C) 1988 Paul Nicholls
SuperDOS V5.1 (C) 1988 Paul Nicholls
SUPERDOS V5.2 (C)2012 JAMES BRADFORD
------------------------------------
- Developed by Paul Nicholls for Super Products (Australia), Happy Computers
(USA), Technical Support (USA), Antic Arcade Catalog (USA)
- Disk drive types supported:
1) Atari 810 (& compatible)
2) Atari 1050 (& compatible)
3) SSDD 5.25" Single-Sided, Double Density
4) Supermax high speed (versions 4.x and up)
5) XF551 high speed (versions 5.x)
6) US Doubler UltraSpeed (versions 5.x)
- Disk allocation/filesystems:
1) Atari DOS 2.0 Single Density
2) Atari DOS 2.0 Double Density
3) Atari DOS 2.5
4) "Atari DOS 2 Skewed Sectors" for Supermax drives
Antic: "Skewed sector disks read and write much faster than standard
format disks (while Atari DOS 2.0 and 2.5 can still read and write
them)."
- Menu driven. Density-smart: Automatic density detection.
- Fully RAM-resident. Highly configurable.
- Supports four floppy disk drives and assumes that any drive reference above
4 is a RAMdisk.
- RAMdisk support is provided for the Atari 130XE and upgrade formats
including 128KiB and 256KiB Axlon, 256KiB XL and 320KiB XE.
- V5.0 changes:
1. Full support for the Atari XF551 disk drive, including Double-
sided/Double density and high speed transfer.
2. Complete XF551 compatibility with previous disk drives. Double
density drives can read files on Double-sided disks (just as
Single density drives can read Enhanced density disks).
3. High speed transfer and skewed sectors for US Doubler, XF551, and
SUPERMAX.
4. Full sector count displayed, no more 999+.
5. Full support for Newell 256KiB memory upgrade for 800XL.
6. Hold down [Esc] during boot up to reserve the 130XE memory banks
for your program. 256KiB and 320KiB computers can use BASIC XE and a
RAMdisk.
7. Bug in RAMdisk reboot (coldstart) routine fixed.
8. The right margin is no longer set to 37.
- Rights and source code purchased by James Bradford (1994?)
- V5.2 changes:
- Modded slightly to increase the RAMdisk speed
- Disabled the Axlon banking access
- Available:
http://www.atariage.com/forums/topic/197622-superdos-ramdisk-speed/

BiboDOS V 5.1N (p) E.Reuss (c) 1987 COMPY SHOP
BiboDOS V 5.2F (p) E.Reuss (c) 07/1987 Compy-Shop
BiboDOS 5.4RF (p) E.Reuss (c) 06/1988 Compy-Shop
BiboDOS 6.4RF (p) E.Reuss (c) 06/1988 Compy-Shop
BiboDOS 5.4AN Turbo-BASIC-Version/R-Disk Jan/89
Bibo-DOS 7.0 (p) E.Reuss (c) 1990 by J.Kruszona
--------------------
- XL/XE only
- Densities supported: single, medium, double
- Disk allocation/filesystems:
1) Atari DOS 2.0 Single Density
2) Atari DOS 2.5 Enhanced Density ("Medium Density")
3) Atari DOS 2.0 Double Density
4) "Atari DOS 2.0 Quad Density" (XF551 DSDD 360KiB)
- Version 6 and up only
- Extension to above standards:
Long/large directories (128 files per disk)
- N versions without high speed support
- F versions support high speed with the Speedy 1050 and Happy
- R versions support 64KiB, 128KiB, or 256KiB RAMdisk
- 130XE and Compy-Shop memory upgrade types supported by default;
can also be customized to support other memory upgrade types

Turbo-DOS XL/XE 1.5 (1988 February)
Turbo-DOS XL/XE 1.7 (1988 August)
Turbo-DOS XL/XE 2.0 (1989)
Turbo-DOS XL/XE 2.1 (1990)
--------------------------
- Developed by Martin Reitershan, Herbert Barth, and Frank Bruchhaeuser
for Martin Reitershan Computertechnik
- Supports a wide range of relatively advanced hardware while maintaining a
very high degree of compatibility with Atari DOS 2.5.
- Master-Disk produces 4 different versions:
1) Normal Version
2) HS: Version for 1050 with Happy or Speedy 1050
3) XF: Version for XF551 high speed
4) EX: Full version (all three versions)
- Andreas Koch contributes:
supports 256KiB Xtra RAM / RD and supports use of batchfiles; has converter
for DOS 3 and DOS 4; supports 4 formats, up to DSDD 360KiB; does not use RAM under OS ROM; DUP uses a Command Processor; all commands are available via
HELP key; works with XL/XE computers only, does not load/boot on Atari
400/800.
- Atari DOS XLE (1990), developed by Reitershan, was built upon Turbo-DOS.

BW-DOS Ver. 1.00 (C) BEWESOFT 1994 (Jiri Bernasek)(94-06-16)
BW-DOS Ver. 1.10 (C) BEWESOFT / ABBUC 1994 (94-07-14)
- Update #1 Released: 4/95
BW-DOS Ver. 1.30 (C) BEWESOFT 1995 (Jiri Bernasek)(95-12-17)
- Update #2 Released (with Ver. 1.30): 95-12-17
------------------
Another popular, powerful DOS is BW-DOS (it is pronounced "Bay Vay Dos"), freeware by Jiri Bernasek - BEWESOFT.
Disk allocation/filesystem: SpartaDOS File System (SDFS) version 2.0
Andreas Koch writes: "SpartaDOS compatible. Does not use any speeder internally, but comes with external XF551 speeder. Supports 4 drives and RAMdisk, comes with RAMdisk driver for XE compatible RAMdisks up to 1MiB; supports 4 densities: a) Single (90KiB), b) Enhanced/Medium (130KiB), c)
Double (180KiB) and d) DSDD (360KiB); does not use any RAM under OS ROM (so it works on an Atari 800 and with Turbo-BASIC XL); unlike SpartaDOS most commands are external, thus the DOS is only 5KiB short; supports a PAL clock (made by ABBUC regional group "ARGS"); comes with many great utilities (which can also be used with SpartaDOS)."
- Ver. 1.10 distributed by ABBUC as the "Jahresgabe" 1994
- BW-DOS Update #1 Released: 4/95
- New versions of: MENU, RAMDISK, DIRMAST.
- New commands: MOVE, RTIME8, ARGSRTC
- New driver: ARGSPRN
- New program: BWDFUNCT.BAS
- New in BW-DOS 1.30:
- Reading the last byte of a file is now indicated by status 3.
- Installation of new "E:" drivers is now allowed.
- The command "TYPE" is no more limited to 64 characters per line.
- The method of handling the allocation pointers (positions 18 and 20 in
sector 1) was changed. The new method provides much better protection
of the directory-area on disk, and so the directories are not mixed
between data sectors as often as under older BW-DOS versions or
SpartaDOS. This results in faster access to directories. 100% read/
write compatibility with every SpartaDOS versions 2.x and later
retained.
- BW-DOS Update #2 Release: 12/95 with BW-DOS 2.30
- New versions of: BACKUP, COPY, UNERASE
- New commands: DOSDRIVE, NEWED
- New driver: RAMBOX
Available: http://wiki.strotmann.de/wiki/Wiki.jsp?page=BEWE%20DOS%201.30%20Manual

------------------------------

Subject: 7.3.5) What should I know about filenames and filename extensions?

Atari disk operating systems generally support file specifications in the form of a filename of 1 to 8 characters, with an optional filename extension of
zero to 3 characters.

Valid characters for use in filenames/filename extensions:
(varies somewhat by DOS version)
- The letters 'A' to 'Z'
- The digits '0' to '9'
(Many DOS versions do not permit filenames to start with a digit.)
- The underscore character ('_') (DOS XE,SpartaDOS,RealDOS)
- The "at" symbol ('@') (DOS XE)
Spaces and other characters are generally not permitted.

Filenames, including filename extensions, are generally arbitrary, but file naming conventions can be helpful. The most common method is to reserve specific extensions for certain types of files. The following list contains some of the more commonly used extensions and their typical corresponding file types.

Filenames reserved by some DOS versions for files to be automatically run at system startup are listed here as well.

File formats are binary unless described below as "text" where:
- Binary format files are made up of a sequence of bytes of any value from
0-255.
- Text format files (technically, a special case of binary files) are
limited to printable/displayable alpha-numeric characters and symbols,
organized into lines.

.ACT Action! program source code
.ALF AlfCrunch archive file containing one or more compressed files
.AMP Antic Music Processor file
.AMS Advanced MusicSystem file or Advanced MusicSystem II file
.ARC Archive file containing one or more compressed files, compatible with
the multi-platform SEA ARC format. On the Atari, best supported by
SuperARC/SuperUnArc or the SpartaDOS X ARC external command.
.ASM Assembler Editor program source code, LISTed. ATASCII text.
.ASC ASCII text file
.ATA ATASCII text file
.BAS BASIC SAVEd program. Less common: .SAV
.BAT Batch file of DOS commands (DOS XE,SpartaDOS,RealDOS). ATASCII text.
- AUTOEXEC.BAT batch file runs at system boot
(DOS XE,SpartaDOS,RealDOS)
.BIN (1) File transferred using CompuServe CIS 'A' Protocol. Fully supported
on the Atari by TSCOPE/MSCOPE/RSCOPE; also download support by Express!
3.x (filenaming convention used on CompuServe before February 1987); or
(2) a ROM dump file as described in another section of this FAQ list
regarding file formats for entire disks/tapes/cartridges.
.BXL BASIC XL SAVEd program
.BXE BASIC XE SAVEd program
.CMD Batch file of DOS Commands (XDOS). ATASCII text.
.COM DOS external Command (DOS 2.5,DOS XE,SpartaDOS,RealDOS,XDOS)
.CTB Compiled Turbo-BASIC XL program
.DAT Data file (typically created/used by another program)
.DCM Disk Communicator 3.2 disk image file. Less common: .DSK or .DC3
.DOC Documentation text file (perhaps ASCII or ATASCII)
.DOS DOS system file (SpartaDOS,RealDOS)
.EXE Executable ('Load and Go') machine language (object code) program
.HLP Help text file (perhaps ASCII or ATASCII)
.LGO LOGO SAVEd workspace file. ATASCII text.
.LST LISTed BASIC program. ATASCII text. Less common: .LIS
.M65 MAC/65 SAVEd program source code
.MIC Micro-Painter picture file ("uncompressed"; 62 sectors under DOS 2.0S).
Format, minus color data, also supported by Illustrator versions using
the filename PICTURE and [Insert] to save file or [Clear] to load file. .MUS Music Composer file
.OBJ Object code (machine language) file (not 'Load and Go')
.OBX Modern naming convention for an object code (machine language) file (not
'Load and Go'). Used to discourage modern computers from thinking that
Atari .OBJ files might be MS-DOS/MS-Windows object code files.
.PIC Micro Illustrator/KoalaPainter/AtariArtist "compressed" picture
.PLT PILOT SAVEd program. ATASCII text.
.PRN Text file formatted for copying to Printer (perhaps ASCII)
.SAV File named MEM.SAV may be employed by DOS to preserve the contents of
memory to disk when DUP.SYS (DOS 2.0,DOS 2.5) or KCP.SYS (DOS 3) is
loaded into memory.
.SCP SpartaDOS SCOPY disk image file. Used with SCOPY, an external command
distributed with SpartaDOS 3.2.
.SFX Self-Extracting archive file. Created with the CTH SFX program.
.SYS DOS System file or driver
- AUTO.SYS can be used to automatically poke data in RAM locations on
system startup (DOS I)
- AUTORUN.SYS binary file is launched on system boot
(DOS 2.0,DOS 3,DOS 2.5,RealDOS,XDOS)
- AUTORUN.SYS batch file of DOS commands runs at system boot (XDOS)
.TUR Turbo-BASIC XL SAVEd program. Less common: .TBS
.TXT Text file (perhaps ATASCII or ASCII)
.UTL A DOS external utility program (DOS 3)
.XEX Modern naming convention for an executable ('Load and Go') machine
language (object code) program. Used to discourage modern computers
from thinking that Atari .EXE files might be MS-DOS/MS-Windows
executable programs.
.XMO Binary file, uploaded/download using XMODEM file transfer protocol

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