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OS9MAX allows to backup OS-9 disk devices to PC. The OS-9 disk will be linked
via TCP/IP network to the PC. As an option you may also connect the OS-9 disk
directly to the PC mass storage controller.

Do you know how long your hard disk will work properly ? What happens to your company if old tape backups are defective and not readable ? We have developed a new PC hosted backup method for OS-9 media. Our method allows to backup all kind of OS-9 media such as hard disk, SyQuest cartriges, PC cards, PCMCIA cards, and diskettes on CD-ROM. We are using a standard PC with a network card and a CD-ROM recorder for creating the CD-ROM. The complete OS-9 disk will be transferred via TCP/IP network to the PC hard disk by typing a single command on the PC side. A complete OS-9 media will be stored in a single file on the PCs hard disk. OS9MAX64IM software is capable of interpreting the disk backup file as an OS-9 media. This allows to work on your OS-9 media under Windows. You may copy data (files and directories from your OS-9 backup to the PC hard disk (read) and vice versa (write). As soon as the file has been saved to CD-ROM it is a read-only device. You may combine any number of OS-9 media (but less than 700 MB) on a single CD-ROM.

Our software supports all OS-9 disk devices on PC (directly and via network):

Floppy Diskettes SD/DD/HD
Hard disks
SyQuest, ZIP

DTR provides full format implementation service on special devices at no additional charge.

ISO 9660
The format we use for storing the backup files on CD-ROM (each file represents a complete OS-9 disk) is ISO 9660 format (high sierra standard, yellow book). This is an operating system independent norm and will be available on any operating system in the future. As you will be well aware it is no problem to store the CD-ROM backup for 100 years, but you must also be able to access the data on it in 100 years. So if you intend to backup your data for years we recommend to use the ISO 9660 standard. This will give you the security that your backup will be restorable f or decades. OS9MAX will read OS-9 backups on any operating system in the future.
Today a CD-R is available in different versions. The differences between them are recording time and storage capacity. The manufacturer Mitsui gives a lifetime guarantee of more than 100 years for the Phthalocyanine DYE (63 min CD-R disc). The costs per single CD-R media: 2 US$ !

lifetime guarantee for more than 100 years (Kodak, Mitsui)
high resistance against temperature, uv, magnetic fields
minimum search time and fast data transfer (random read)
the ISO 9660 CD is usable with many OS (DOS, UNIX,..)
highly portable disc
low cost recordable media
low cost storage requirements
no refresh of media necessary
no mechanical altering and magnetism problems like tapes
The backup method we introduce needs a TCP/IP network connection between PC and OS-9 system. Nearly all OS-9 mass storage devices are RBF devices except tape devices (SBF media). OS-9 NFM devices ('/n0/es1/h0') can be backup too if the physical device ('../h0') is a RBF device. SBF tape devices should be restored to the hard disk of the OS-9 system first (to a temporary directory) before being stored to CD-ROM. The RBF formatted devices include diskettes, hard disks, removable disks, SyQuest cartriges, chipcards, PC cards, or PCMCIA devices.

Netdisk utility from OS9MAX toolbox

A single command gives you a backup of a complete OS-9 media. No bit of data will be lost. Everything of the disk has been saved: the complete file structure, all directories, all date and time stamps, all attributes, all logical disk structure information, the disk id and boot sector, and the file allocation table. After the backup has completed you will find a file on the PC with the same size as the original OS-9 disk. You will be able to rebuild your OS-9 disk from this backup within minutes. In additon we deliver a software which interprets the PC backup file as a physical OS-9 device. This allows to read and write data (files and directories) from/to the backup file. The complete OS-9 file structure is accessable from MS-Windows. Nearly all file system commands have been implemented. This software is a successor of the program OS9MAX which has been introduced to the world wide OS-9 usership by Radisys/Microware through their Pipeline publication.


The OS-9 disk '/h0' has been transferred via network to the PC. The file 'd:\image\os9disk\h0.img' has been created on the PC hard disk with 160 MB. This is exactly the size of the OS-9 disk. Before you wish to save this backup to CD-ROM you may collect other OS-9 media on the PC hard disk, or revise the backup files with OS9MAXIM. This software allows to access the backup files as if they were physical OS-9 media. OS9MAXIM allows to transfer/copy OS-9 files and directories from the backup to the PC hard disk and vice versa.

Start the utility by typing:

OS9MAXIM d:\image\os9disk\h0.img

All OS-9 file manipulating commands (i.e. copy, del, dir, pd, makdir, deldir, dcheck, free, ...) are implemented. As long as the backup files are located on a hard disk they may be manipulated by the utility. After writing these files to the CD-ROM they are read-only. The directory structure on the CD-ROM backup is exactly the same as on the physical OS-9 media.

As an option we offer a second backup method. This may be interesting if your OS-9 system has no network connection or your commpany has no network experience. If you plan to archive diskettes and chipcards this may also be the most convenient way.

Hard disk:

If your OS-9 hard disk has been formatted with 512 bytes/sector (this is standard nowadays) you may connect this drive directly to your PC SCSI or IDE controller. Please refer to the manuals of your PC, controller, and hard disk. Our software will read the whole drive by typing a single command:

OS9MAXHD d: hdd 'dread hdd_esy1.img'


OS-9 diskettes are directly accessable with every PC. This is the command line to backup a complete diskette:

OS9MAX a: 38u0 dread mydisk1.8u0

The following line shows how to rebuild the media from the file:

OS9MAX a: 38u0 ‘dwrite mydisk1.8u0


If your computer is equipped with a PC Card interface (PCMCIA slot) you may access OS-9 formatted PC Cards (chipcards) directly with the PC. This allows also to backup (copy) SRAM cards to FLASH cards and vice versa.


Finally if your CD-ROM has been written and contains 680 MB of OS-9 disk, you wish to read this CD with a PC. No problem, any PC which is equipped with a standard CD-ROM drive is capable of reading this CD-ROM. Insert the CD into the PCs CD-ROM drive and start the utility as follows.

OS9MAXIM h:\h0.img (CD-ROM drive is 'h:')


Now you may extract files and directories from the OS-9 backup to your hard disk.

Note: for user convenience the OS-9 drive letter is '0:'.

copy 0:\*.* g:\

OS9MAXIM allows to restore/ rebuild the OS-9 disk from its original data on the OS-9 side. This allows - similar to the PC side restore strategy by using OS9MAXIM - to produce multiple copies (100% identically) of the original media.