amd64 missing addressing modes

[anthony]

I try to use amd64 assembly with addressing mode base with displacement, 
scaled index and scaled index with displacement gforth i.e.

mov (%rdx,%rcx,1),%rax
mov (%rdx,%rcx,4),%rax
mov 40(%rdx,%rcx,4),%rax

I installed gforth from git version 0.7.9_20200820 on linux opensuse 
15.1 64 bit.
I included this code to test:

ABI-CODE A  ( -- )
    500  #  AX  MOV    \ AX := 500
    DX  AX  MOV    \ AX := DX
     200  AX  MOV    \ AX := (200)
     DX  )  AX  MOV    \ AX := (DX)
     40  DX  D)  AX  MOV    \ AX := (DX + 40)
\  DX  CX  I)  AX MOV    \ AX := (DX + CX)
\  DX  CX  *4  I)  AX  MOV    \ AX := (DX + CX * 4)    *1/2/4/8
\  40  DX  CX  *4  DI)  AX  MOV    \ AX := (DX + CX * 4 + 40)

    DI  AX  MOV
    RET
END-CODE

Compiling any of the now commented three lines results in an "invalid 
memory address" error.
Maybe I am using an invalid syntax? Thought this was the correct syntax 
after reading asm.fs

Every help is very much appreciated.
Anthony