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3 SIDs (SIDs on addresses $D400, $D420 and $D500)
Adjust SID Addressing in Ultimate 64 configuration
U64: SID Socket 1 Address ... $D400
U64: SID Socket 2 Address ... $D420
U64: Ext DualSID Range Split ... A8
Configure ARM2SID using ARM2SID Test and Configuration Utility
ARM2SID: PIN CONNECTIONS ... WIRE
ARM2SID: $D400 ... SIDL
ARM2SID: $D420 ... SID3
ARM2SID: $D500 ... SID3
ARM2SID: $D520 ... SIDL
ARM2SID: $DE00 ... SIDR
ARM2SID: EMULATION MODE ... 3SID