Bus Error testing results (word access):
(1040 STf, with Ricoh chipset)

$FF8002 - $FF8200
$FF8210 - $FF8240
$FF8280 - $FF8604
$FF8610 - $FF8800
$FF8900 - $FFFA00
$FFFA40 - $FFFC00
$FFFE00 - $FFFFFE

EOF!
