How old is the average user of these boards?! 13? I feel old here...
Anyway... No, there was no cassette based arcade hardware from SNK. But...
Someone wrote "It's BS. Just think about it, no arcade system would work using cassette tapes. It would be too slow and unreliable."
Wrong. (mostly - history lesson coming up...)
There was a cassette tape based arcade system from the very early '80s (81-84) made by DECO. Some examples of games on the system were Burgertime (just like the PCB version) & Rootin Tootin. While the system allowed arcades to very inexpensively change games, it WAS unreliable and tapes did indeed break and suffer from wear and tear. As a result, the system failed eventually since arcade owners cared far more about reliability than price - if the machines weren't running, they could lose far more than the price of a brand new PCB kit.
Now, here's where the anti-emulation nitwits can shut up and suck their thumbs. Luckily, due to the efforts of MAME team, you can still see what many of those DECO cassette games were like, even the slow inital loading from tape to memory is emulated. This was one of MAME's most amazing feats of preservation during the past year, since many of those tape games were thought to be forever lost already, but thankfully an expert dumper (yeah, an "evil" dumper) managed to save some of these games. The emulation aspect was simple since the hardware was basically identical to the already emulated DECO hardware for Burgertime & Bumpn'Jump. For anyone interested in videogame history and nostalgia, it's well worth a look. Some of the games are also fun in a super-retro sort of way. Just don't expect NeoGeo graphics. <IMG SRC="smilies/wink.gif" border="0">