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Wrong syntax of 16-bit value in zeropage #1

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opened 2025-03-28 12:18:46 +01:00 by hugova · 0 comments
hugova commented 2025-03-28 12:18:46 +01:00
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Throught the code a value in zeropage are stored like this x =$4041 where we have always used >x = $40 as the low nibble and the <x = 41 as the high nibble. The problem is 2-folded. One is that this is not per the cc65 documentation, the > operator should signal the high nibble and vice versa. The other problem is that to store $4000 to x its needed to do this:
LDA #<$4000
STA >X
LDA #>$4000
STA <X

Yes its ugly and should look like this

LDA #<$4000
STA <X
LDA #>$4000
STA >X

Throught the code a value in zeropage are stored like this x =$4041 where we have always used >x = $40 as the low nibble and the <x = 41 as the high nibble. The problem is 2-folded. One is that this is not per the cc65 documentation, the > operator should signal the high nibble and vice versa. The other problem is that to store $4000 to x its needed to do this: LDA #<$4000 STA >X LDA #>$4000 STA <X Yes its ugly and should look like this LDA #<$4000 STA <X LDA #>$4000 STA >X
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Reference: Stacken/c64-livecoding#1
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