Similar to old-school games, I'd like the player to be able to save their progress at specific rooms in the adventure. Ideally:

1. The player should not be able to use the save command.
2. The player would use a thing in order to save. Like a typewritter in RE.
   a) The game should ask for confirmation of the save.
   b) If the player agrees, then the save is made.

How can I get this done?
Thanks in advance!