D48= #MAC FFSTDESC [J.S.RAYNER.G4 ONLY
D4MW FDESC %A [ADDR OF ONE OF THE TABLES DESC WORDS
D57G MOD LDX 0 0,%A
D5M6 SLC 0 7
D66Q ANDN 0 15 [EXTRACT LENGTH OF TABLE
D6LB NGX 0 0
D762 ANDX %A 0 [ADDR OF FIRST DESC WORK
D7KL #NOR