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48018: Get current border colour in A
Used by the routines at 47897, 47946 and 47989.
Output
A Current border colour (0 - 7)
48018 LD A,(23624) Load A with stored border colour
48021 RRCA Clear bits for 1, 2 and 4 to leave (border colour × 8) only...
48022 RRCA ...
48023 RRCA ...
48024 AND 7 Ensure all other bits are cleared
48026 RET Return
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