Since that’s a pre-DAT machine unpopular in 1980 I wouldn’t imagine you would need very many extra cups and saucers for guests. What form is the work in now? Not the original tape, I hope.
The material is supposed to be semi-complaint Pulse Code Modulation, so it might be possible to just open (Import) them into Audacity.
If you have a working tape machine, you might be able to use the DAT trick and pump the Headphone output into the computer stereo Line-In. If your Windows machine has no Line-In (very likely) then you can add a stereo adapter.