Data commit

Task/Gotchas/6502-Assembly/gotchas-1.6502

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+LDA 'J'  ;load the 8-bit value stored at memory address 0x004A into the accumulator.
+OR 3     ;bitwise OR the accumulator with the 8-bit value stored at memory address 0x0003
+
+
+LDA #'7' ;load the ASCII code for the numeral 7 (which is 0x37) into the accumulator.

Task/Gotchas/6502-Assembly/gotchas-10.6502

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+LDA #$20
+STA $30FF
+LDA #$40
+STA $3100
+JMP ($30FF) ;rather than take the high byte from $3100, the high byte is taken from $3000 instead.

Task/Gotchas/6502-Assembly/gotchas-2.6502

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+byte $45  ;this is the literal constant value $45, not "the value stored at memory address 0x0045"

Task/Gotchas/6502-Assembly/gotchas-3.6502

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+INC $2005 ;the intent was to scroll the NES's screen to the right one pixel. That's not gonna happen.
+;What actually happens? Who knows! (I made this mistake once long ago.)

Task/Gotchas/6502-Assembly/gotchas-4.6502

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+LDA #$20
+CMP #$19
+BCS foo  ;this branch is always taken, since #$20 >= #$19. If this were any other CPU this branch would never be taken!

Task/Gotchas/6502-Assembly/gotchas-5.6502

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+LDA #8
+SEC
+SBC #4 ;eight minus four

Task/Gotchas/6502-Assembly/gotchas-6.6502

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+CLC
+ADC ___ ;your operand/addressing mode of choice goes here

Task/Gotchas/6502-Assembly/gotchas-7.6502

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+LDX #$FF
+LDA $80,X ;loads from address $007F, not $017F

Task/Gotchas/6502-Assembly/gotchas-8.6502

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+LDA $2080,X ;loads from the correct address regardless of the value of X.

Task/Gotchas/6502-Assembly/gotchas-9.6502

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+LDA #$20
+STA $3000
+LDA #$40
+STA $3001
+JMP ($3000) ;evaluates to JMP $4020