Whole directories of files seem to be lacking in the
2.4 distribution of SDCC for WIndows. Examples are asm/
and support/ directories. Must these be taken from the
Logged In: YES
What should be in /asm or /support ? These directories are part of the source tree not of the distribution. They are neither in the windows nor in any other binary distribution. If you want them they can be taken from the source distribution or directly from subversion.