OK, so we need to use relocatable buffers to avoid the "everything else comes later than the absolute" problem

this worked with some assembler I used in the past

something like

ORG ((* + 16) & 0f0h)
I do not recall the syntax, but am sure I did some such thing succesfully.

I would not know a) what syntax to use in Keil (it would probably involve RSEG) b) if it will work with Keil, but try it

If you absolutely want your buffer at the end something like
ORG ((stack + 48) & 0f0h) might do the trick.

Another possibility would be to remove all IDATA from 'c' and move it to assembler and extern it in a .h file.

Erik