     $D0B2/53426/SCPU+66:   Hardware Register-/System Flag

       +-------+--------------------------------------------------------+
       | Bit 7 |   Hardware Register Enable Flag: 1 = Enabled           |
       | Bit 6 |   System 1 MHz Flag: 1 = Enabled                       |
       +-------+--------------------------------------------------------+

         This register is read only with hardware registers disabled,
         Read/Write with hardware registers enabled, write access reserved
         for system only.