$0281-$0282/641-642:   Pointer: Bottom of Memory for Operating System

   Default Value is $0800

Kernal-Reference:

 LDX $0281   : $FE36
 STX $0281   : $FE3C

 LDY $0282   : $FE39
 STA $0282   : $FD92
 STY $0282   : $FE3F

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