Like a lot of users, I use my IBM Model M keyboard with my Windows computer, however with my vintage computer collection, I use the original keyboards that came bundled with the systems when they were new. For instance, my Apple lle, I use the venerable Apple ol keyboard, and each of my IBM systems use either the Model F, AT, or Model M boards, and finally, my Trs80 Model 4 uses the keyboard that was included in the "all-in-one" cabinet. Of course my Commodore uses the keyboard that was installed in the computer's case, which made the Commodore what it was. Of course, there are other computers, and their original keyboards. I'm definitely always on the lookout for other systems that include their original keyboards. I have even turned down offers of vintage computers simply because the keyboard/computer were mismatched.
