You cannot install DOS 6.22 from CD-ROM. You must use Floppy Disk Images and a Virtual Floppy added to the Virtual Machine. If you have physical floppy diskettes you will need to create virtual floppy disk images which would mean on a Mac you'd have to plug in an External USB Floppy and then use dd or maybe Disk Utility. I forget whether Disk Utility can do it but I know dd can do it.
Have a look at: VMware Fusion menu > Help > VMware Fusion Help > Managing Virtual Machines > Configuring a Floppy Device
I have a USB external floppy (which apparantly cannot be used to install from) and I have tried creating an unecrypted, uncompressed, read/write disk image (renamed to flp) and used as a device for the VM.
Nothing works. The vm just hangs upon starting.
I've tried DOS 6 and 6.2and am using VMWare Fusion 2.0
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Well you didn't say how you were creating the floppy image however I will say that I have no problem creating a floppy disk image of a floppy in a USB Floppy Drive attached to my MBP using dd or Disk Utility.
In a Terminal (/Applications/Utilities/Terminal) the following command syntax works.
dd if=/dev/BSD_Name_USB_Floppy_Drive of=Floppy_Disk_Name.img
Example: In System Profiler the BSD Name of the USB Floppy Drive connected to my MBP at the moment is named "disk3" and using a DOS 6.22 Setup Disk 1 I used the following command.
MacBookPro:~ WKZ$ dd if=/dev/disk3 of=DOS_622_Setup_Disk_1.img
2880+0 records in
2880+0 records out
1474560 bytes transferred in 112.648263 secs (13090 bytes/sec)
I then assigned DOS_622_Setup_Disk_1.img to the Floppy in the target Virtual Machine's Settings and it booted just fine and started the DOS 6.22 Setup.
If you want to use Disk Utility (/Applications/Utilities/Disk Utility) you need to set the Image Format to DVD/CD master and Encryption to none.