Topic       : Pure Assembler Documentation
Author      : John Kormylo
Version     : PASM.HYP 1.0
Subject     : Documentation/Pure Assembler
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Index Size  : 20262
HCP-Version : 3
Compiled on : Atari
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View Ref-File[ Addressing mode for MC68020 only ]

([b,An],Rx,d), ([b,An,Rx],d), ([b,PC],Rx,d) and ([b,PC,Rx],d)
addressing modes were implemented on CPUs: 234 only.

d(An,Rx) and d(PC,Rx) addressing modes cannot use the size modifier
(Rx = D0.W) for CPUs: 01.

Also, 32 bit PC relative was not implemented until CPUs: 234.

Either set the assembler to use the correct CPU or stop using that
addressing mode.  (See Assembler Options and MC68nnn directive.)