If you can get your mitts on a 9 pin to USB adapter you can connect an original 80s/90s joystick to your modern computer, and blissfully pretend the last few decades of 'evolution' are but a bad dream. The hitch, however, is that many of the poor blighters will have been twisted, yanked and crushed to within an inch of their wretched lives, and so can't be guaranteed to work.
Another option is to find a newly manufactured 9 pin joystick and hook that up instead. Impossible you may scoff, but this is precisely what makes the Atari Flashback so alluring. It's a remodelled Atari 2600 games console that hooks up to your TV allowing you to play dozens of classic games as if it were 1977.
Coincidentally the package includes two authentic CX-40 9 pin joysticks which are compatible with original Spectrum, Amstrad, Commodore and Amiga computers, the Sega Mega Drive and Master System consoles, as well as your retro joystick adapter. Even if you have no interest in the Atari 2600, for £17.99 (the best price I found on Amazon), it may be worth a punt for the controllers alone, at least until these are made available as a standalone purchase. Incidentally, for adaptorless gamers, the same company behind the Flashback - Legacy Engineering - produce a variety of USB versions to be used specifically with emulators.
The fourth rendition of the Flashback is due to hit the shops in time for Christmas and features two not-so-retro wireless joysticks. Unfortunately these will only work with the Flashback because the infrared sensors are built into the console itself. The archetype comes with two 7800-style paddles, while the second and third incarnations both include wired joysticks. I'm told that the FB3 joysticks have a greater 'throw', are looser and suffer from more microswitchy clickety-ness than their FB2 counterparts, the latter more closely resembling the sword-in-the-stone originals.
Reviews of the various console editions diverge wildly across reputable, retro gaming sites and on YouTube, but what you can be certain of is that they're rock solid/will disintegrate in a light gust, play just like the 30 million-selling prototype and are an aberration that would have Jack Tramiel spinning in his grave.