There seem to be no differences between the grammar of Borland Delphi 4 and D5.
However diffs between D6 (VER140) and D4 are the following:

- 'local' - directive
  ignored in Windows programming?
  is 'exports' allowed in units, not only libraries?

- 'platform', 'deprecated', and 'library' - hint directivee
  after declarations of identifiers, and after the 'end' of routines.
  'library' should be a directive? As long as keywords have no contextual
  scope, 'library' should be left as keyword.

- 'varargs' - directive
  "The varargs directive works only with external routines and only with the cdecl calling convention."
  used for "importing a C++ function that takes a variable number of parameters"


- some new comment-directives: {$MESSAGE  {$SetPEFlags  {$$SetPEOptFlags
  "new $IF directive with constant expression evaluation"
    {$IF Defined(WIN32) and (SomeConst > 12.0) }

- new assembler: 
  "New directives, VMTOFFSET and DMTINDEX
   New instruction support: MMX, SIMD, Enhanced MMX, and Intel SSE for the Pentium Pro, Pentium III, 
   and Pentium 4 CPUs; and AMD Enhanced 3D for the AMD K7 CPUs.
   New support for DQ (define quadword data) pseudo-opcode."

----------------------------------------------------------------------------------------

My schedule:

- update comments for Chartable "string : UPARROW  IMMCHARR_ID ;"
  conversion goes rather
  "if $61 <= x <= $7A then Result := ( x XOR $40 ) - $20 else Result := ( x XOR $40 );"
- first rewrite D4 grammar to EBNF with help of Aedil's y22l.awk (Yacc to LaTeX)
  (see http://y2l.sourceforge.net/download/y2l.tar.gz ).
  (I wrote a Ebnf2Yacc.sed script so this should cause problems for yacc users.)
- rename some %token according to (Character Mnemonics, ISSO 2DIS 10646, rfc1345)
- generate good docs with LaTeX package named rail.
- consider other parsing strategies; e.g. generate a RDP wwith the simple tool Compmake
  (Compiler-Maker 1.0; Toolbox 1994.06 )
- port grammar from D4 to D6; may be a complete front-end  with AST-generation ...

if i find enough time, ...