$028D/653:   Flag: Shift Keys

   +-------+--------------------------------------------------------+
   | Bit 2 |  1 = CTRL pressed                                      |
   | Bit 1 |  1 = CBM pressed                                       |
   | Bit 0 |  1 = Shift pressed                                     |
   +-------+--------------------------------------------------------+

Kernal-Reference:

 LDA $028D   : $EB48
 LDY $028D   : $EB2A
 ORA $028D   : $EAC1
 STA $028D   : $EA89 $EAC4

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