$07/7:   Search Character/Temporary Integer during INT
 $07-$08/7-8:   Temporary Integer during OR/AND

Kernal-Reference:

 ADC $07     : $A997
 AND $07     : $B00F
 CMP $07     : $B49C
 LDA $07     : $E011
 LDX $07     : $A913
 LDY $07     : $BF9C
 STA $07     : $A915 $A975 $AC61 $AC65 $AC6D $AFF4 $BCE4
 STX $07     : $A90B $B489

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