Yup.
BECMI/RC is in my top 3 RPG's of all time. Still play it to this day, off and on, and use a fair number of the rules and systems in it for other game systems/versions (skills, war machine, elemental stuff, race "cultural focus"...Tree of Life, Blackflame and Forge, and sometimes the weapon masteries; Random Dungeon Generation, Morale system...just sooooo many good rules in that thing!).
Anyway, if you want to play it with others and they don't have copies of the RC (they can go for $100, easy, IF you can even find one for sale), go grab "Dark Dungeons". It's basically a retro-clone of the BECMI/RC stuff (minus some of the specific Immortals stuff). It also has a nice simple "thac0" style SLIGHT modification of To Hit vs AC. In a nutshell, each class/race gets a 3e'esque "Base Attack Bonus". That's used, plus the normal modifiers, then you roll your d20 and add the AC of your opponent; if it's 20+, you hit. You can still use the RC tables thought, if that's more your thing. They work out to be almost even except at the extreme ends (like AC 14 or AC -22, etc). It makes for an even FASTER combat round....which is already fast in BECMI.
You can get PDF version of Dark Dungeons for free, or you can pay for a Lulu PoD in various flavours (I loved the system so much I bought a deluxe hardback colour version for myself, plus 7 or 8 other softback b/w copies to give to my players as gifts; expensive, but worth it!).
Here:
PDF:
Dark Dungeons - Gurbintroll Games | DriveThruRPG.com
Lulu:
Lulu
^_^
Paul L. Ming