DriveThruRPG has a write-up on it:
link. There were resources available on the Internet, years ago: errata; night rules; magic items specifically designed for 2e
BS play. Not sure how hard they are to find, today. As always with the Internet, it is best to download a copy, and archive it, yourself!
I wrote up my own index for it. I went through a lot of hoops to get it printable by Lulu.com, in a hardcover format... Unfortunately, I forgot to add my Index to it before I ordered my copy of it! Grrr!...
I had to use high quality ink, and high quality paper, to get Lulu.com to print it, which made it much nicer, but more costly: $40 delivered, for a 96-page hardcover book.
I had to mash together my own cover design because I could not figure out Lulu's cover system, so it is not like the original, but that is minor. I really love having a high quality hardcover copy of it to use for the remainder of my time gaming.
They also published a version called,
BattleSystem Skirmishes (sadly, no write-up), which is billed as a skirmish miniatures game. It really is a variant of the
RPG rules: it simplifies the combat, reducing a figure's/character's Hit Points to One Point per Hit Die/Level. A 9th level Fighter, for example, will have 9 Hits, before being killed; other character classes have fewer Hits/Level, similar to the
RPG system. Every successful Hit, causes One Hit of Damage -- combat is very fast. Armor Class, and To Hit, are the same as the
RPG rules.
It's a nice game, but it is miniatures focused, with terrain (wet-/dry-erase mats, to full, 3D modeled terrain). It plays really well, and it could be used to replace the
RPG combat systems, thereby speeding up combat resolution,
tremendously. I've been tempted to adopt it into my
RPG games, to avoid 10 game minutes of combat, from taking 1-2 hours to resolve!
Both books contain conversion rules for just about anything you want. They
both contain outdated, but still effective, painting guides, with plenty of pictures to help comprehend the written instructions. They also address how to make some of the 3D terrain elements featured throughout the books. Both are fun to read, and fun to play. Cheers!