," xxx" --     Write xxx to HERE
." xxx" --     *I* Compiles string literal xxx followed by a
               call to (print).
C<?     -- f   Returns whether there's a char waiting in buf.
C<      -- c   Read one char from buffered input.
DUMP    n a -- Prints n bytes at addr a in a hexdump format.
               Prints in chunks of 8 bytes. Doesn't do partial
               lines. Output is designed to fit in 32 columns.
EMIT    c --   Spit char c to output stream
IN>     -- a   Address of variable containing current pos in
               input buffer.
KEY     -- c   Get char c from direct input
PC!     c a -- Spit c to port a
PC@     a -- c Fetch c from port a

                                                        (cont.)