[Coco] CoCo 3 MMU test for all

[Robert Gault]

Arthur Flexser wrote:
> You might want to check whether your assembler assembled LDB 0,X and LDB ,X
> using the same postbyte for both, if both gave you $38.  I'm pretty sure
> LDB 0,X, if assembled correctly, should have yielded $78, same as PEEK does.
> 
> Art

EDTASM gives the following:

  ldb 0,x     $E6 $00
  ldb  ,x     $E6 $84

So, the code is different.