Mike Ford wrote:
  Someplace in my office I have a old program by Laser
Systems that  reads
 the rom and makes a "clean" commented disassembly listing of  it. Randy
 Hyde wrote it as a kind of exercise for his disassembler,  so its pretty
 complete as I remember with proper variable names etc.  Apple didn't let
 it stay long on the market though. 
I presume by "disassembly listing of it" you are referring to Integer
BASIC.  There's no need to disassemble Programmer's Aid #1 as the source
listings are in the manual.
There are some errata/patches to Programmer's Aid #1.  I don't have the
printed information, and I'm not sure whether the patches were applied
to the version in the INTBASIC file.