CD BOOT FAILURE ON OLDER COMPUTERS
Some older BIOSes are unable to boot CD1.
A workaround using CD2 (amd64 architecture) is as follows.
(An amd64 machine is NOT required for this to work.)

   1. Insert CD2 and tell your computer to boot it;
   2. When the boot> prompt appears, stop the automatic boot by pressing the
      space bar;
   3. Remove CD2 and insert CD1;
   4. Erase the character you typed to stop the boot, type
      boot /4.2/i386/bsd.rd
      then press Enter.

No source code patch exists.