🚀 go-pugleaf

In article <1992Aug2.194522.18244@menudo.uh.edu> cosc16to@menudo.uh.edu (Andy Hakim) writes:
> 
>Another method of obtaining a formatted disk for the Pro-3xx, is to
>use an image copy program called Teledisk (shareware) for the PC.  Not only
>does this program allow you to do a disk-to-disk copy, but it can also
>store a disk into a file (on the PC).  This way, it is possible to keep an
>image file of a blank P/OS formatted disk, and then crank out new copies
>easily.

Where can I obtain Teledisk?  Does it require any low-level preformatting
of the media on the target?

IF you use DR-DOS and RAINDOS (but not RX50DRVR) you can use DISKCOPY and
DISKCOMP to copy RX50 MS-DOS diskettes to each other, or to files on the
hard disk:

DISKCOPY E: C:\RX50DISK.IMG

DISKCOPY E: E:

DISKCOPY C:\RX50DISK.IMG E:

DISKCOMP E: C:\RX50DISK.IMG

When writing the file or disk image onto a target disk, the diskette has to
be already formatted as a low-level RX50, yet there are no high-level
considerations, so non-DOS RX50's can be directly used as targets!

Of course input diskettes have to already be MS-DOS RX50 DECmate II/Rainbow
diskettes because of DOS restrictions.

Note that DOS 5 cannot do anything but "standard" disk sizes, and can't
copy disk images to files at all.

> 
>In my experience, low density disks (360k) on a high density (1.2m) AT class
>drives seem to work out best.

And without hub rings is better.  If you suspect that a disk is actually
high-density when it has no hub rings, there is a simple test:

Just format it as a normal 1.2 Meg disk.  a low-density diskette will get
hundreds of Kbytes in bad sectors, while a HD diskette will get little or
no errors, thus proving it unsuitable for RX50 purposes.  Most disks with
hub rings are already clearly low-density, but after you remove them, this
will prove a quick check for actual diskette formulation.

cjl