Is there an easy way to emulate ROM paging in IDA, or do I have to disassemble each page separately? 

Thanks.  I saw something about using paging on 8086 code, but it seems that the method depends on the Segment Register.  (AAAHH!  )

(If you happen to be disassembling 2.53 or 2.55 and you are on a x64 machine, I can give you my current progress (I'm pretty sure this is actually legal too ))

Thanks for the offer, but I think I'll learn the most if I disassemble it myself. 

Unfortunately, brandonw.net seems to be down right now.  I'll download that tool as soon as it goes back online.

I should also point out that if you ever intend to consult others or ask questions, brandonW destroyed OS 2.41 and my workhorse is 2.53. Talking about different OS's can be a little challenging sometimes.

I'm going to disassemble OS 2.55.  I want to take a look at the USB routines and the BASIC parser.  Maybe I can fix that annoying mathprint screen glitch.  

EDIT: Hey, look at that!  His site is back up.  
EDIT2: It asks for the end of BCALL jump table.  What should I put down for 2.55?  I don't know because I haven't disassembled the OS yet.  
EDIT3: I entered the example numbers, hopefully that's right.

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EDIT4: Ok, I somewhat figured out the paging. 

Edit > Segments > Create Segment
Segment Name = (Just note that if your name starts with a number, an underscore will be automatically added.)
Start Address = IDA linear address
End Address = IDA linear address + 1 (If you want your page to end at 0x4FFFF, use 0x50000)
Base = (StartAddress - VirtualAddress) / 0x10


Example:
Segment Name: Page02
Start Address: 8000
End Address: C000
Base: 400