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35819: Get current border colour in A
Used by the routines at 35690, 35739 and 35790.
Output
A Current border colour (0 - 7)
35819 LD A,(23624) Load A with stored border colour
35822 RRCA Clear bits for 1, 2 and 4 to leave (border colour × 8) only...
35823 RRCA ...
35824 RRCA ...
35825 AND 7 Ensure all other bits are cleared
35827 RET Return
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