AFAIK, they were discs that contained the program and info needed to produce the tapes for certain game (thus the word 'master', same as music).
So, you run the program on the disk and the spectrum asked you to insert a tape and press play to save an original tape of the game/program.
Those disc were in charge of the duplication/generation of the original tapes with the info of the program contained on the disc.
Edited by Cananas (06/02/20 09:04 AM)
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