13 lines
394 B
Plaintext
13 lines
394 B
Plaintext
GetStringLength: ;$00 and $01 make up the pointer to the string's base address.
|
|
;(Of course, any two consecutive zero-page memory locations can fulfill this role.)
|
|
LDY #0 ;Y is both the index into the string and the length counter.
|
|
|
|
loop_getStringLength:
|
|
LDA ($00),y
|
|
BEQ exit
|
|
INY
|
|
JMP loop_getStringLength
|
|
|
|
exit:
|
|
RTS ;string length is now loaded into Y.
|