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Ingy döt Net 2023-07-01 11:58:00 -04:00
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9
Task/Address-of-a-variable/6502-Assembly/address-of-a-variable-1.6502 Normal file
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;;;;;;; zero page RAM memory addresses
CursorX equ $00
CursorY equ $01
temp equ $02
;;;;;;; memory-mapped hardware registers
BorderColor equ $D020
Joystick1 equ $DC01
Joystick2 equ $DC00

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Task/Address-of-a-variable/6502-Assembly/address-of-a-variable-2.6502 Normal file
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LDA #$20 ; load a constant into the accumulator
CLC
ADC #$50
ASL
SBC #$30 ; do some math
STA temp ; store the result in a temp variable (really a zero-page memory address).

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Task/Address-of-a-variable/6502-Assembly/address-of-a-variable-3.6502 Normal file
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LDA #$30 ;load into the accumulator the constant value 0x30
LDA $30 ;load into the accumulator the value stored at memory address 0x0030.

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Task/Address-of-a-variable/6502-Assembly/address-of-a-variable-4.6502 Normal file
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byte $30,$20,$10,$00 ;these are constant numeric values, not memory addresses.