🚀 go-pugleaf

I am a recent ST buyer, so bear with me if all this has been discussed
before.  I have a vanilla 520ST except that I have TOS in EPROMs.

I picked up a hippo C compiler and started to try writing some of the
example programs.  All was going well until I found that some of the
graphics interface routines appeared to be non-functional.  No problem,
I figured I could write them in assembly and use my own names.  Then
the real problems began.  After trying everything I could think of
(I have been programming in C and assemblers for many years, so lets
not look for the obvious), my assembler subroutines still give me
bombs.

OK, maybe I was doing something wrong.  I tried writing several
example programs completely in assembler.  They work fine.  Seems
to me this points to something in the linker/loader, as all the
bombers involved multiple modules with C and assembly mixed.

Anyway, anybody out there got some helpful hints for me?  Even
if I find out that my $50 was wasted, that's OK, at least I can
stop worrying that I no longer understand anything about computers
the 68000 and C and assembler.

Thanks