I do not know Toshiba systems but did master removing them in the 90's, but some things to note that I read here and there:

-The DK280 system was discontinued almost 20 years ago
-Toshiba no longer manufactures phone systems
-The software needs a special red dongle to interface with a PC
-The software is like a DOS program and is slow and is said that programming via the telset is much easier/quicker
-There might be a DKadmin and also a DKiAdmin software, DKiAdmin may not be compatible with you DK280

Some others might chime in here if your lucky....they might be walking with canes, hunched over & slow moving, bed ridden, shriveled up or just plain old dead!

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www.curlycord.com
Toronto, Canada

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You might want to try posting in a Toshiba forum, such as the following that still seems active.

https://sundance-communications.com/forum/ubbthrea...

Saw a recent question about a DK280 in it that received an answer. (Act quickly - Curlycord's warning has the ring of truth about it for a system that old.)
If you need manuals, those are available from a number of sources, such as: http://www.wedophones.com/ToshibaManualsLead.htm

Everything on a DK8 ,16 and 280 can be programmed through a tel set connected to port 005.

Marv ccna