Junkbox CP/M system?

Hi, I've heard about "IDA", is it commercial or freeware (I suspect the former)? Can't remember what I was using, I'd have to dig out the hard drives all that stuff is archived on (that particular machine expired and after checking the drives were OK I put them aside to deal with later....). Whatever the disassembler I was using, it was extremely configurable, but it was still a *lot* more work than I'd envisioned as it was a totally unknown system to me. In contrast, at around the same time I also disassembled the Atari 5200 and 7800 "BIOS" ROMs, this was a breeze as the 5200 is essentially a 400/800 with a different memory map and I used to program for the 7800. I did post them on my website at the time....another thing I should pull of those drives and put back online! Thanks for the info, seems I'd missed more of the developments in the IDE world than I'd thought. :-) TTFN - Pete.