$56-$5D/86-93:   Storage for 5 GCR bytes

ROM-Reference:

 LDX $56    : $F86F
 ORA $56    : $F6F9
 STA $56    : $F6E7 $F7EF

 LDX $57    : $F874
 ORA $57    : $F70B $F720 $F809
 ROR $57    : $F6F2 $F6F5
 STA $57    : $F6D2 $F70D $F7F7 $F80B

 LDX $58    : $F87B
 ORA $58    : $F733
 STA $58    : $F71B $F812

 LDX $59    : $F880
 ORA $59    : $F749 $F764 $F827
 STA $59    : $F73B $F74B $F81C $F829

 LDX $5A    : $F887
 ORA $5A    : $F777 $F83C
 ROR $5A    : $F75A $F75D $F760
 STA $5A    : $F6D4 $F830 $F83E

 LDX $5B    : $F88C
 STA $5B    : $F846

 LDX $5C    : $F893
 ORA $5C    : $F862
 STA $5C    : $F84F $F864

 LDX $5D    : $F898
 STA $5D    : $F86A

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