Routines
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\$0D67: Check whether a character is within a coordinate range
Used by the routines at \$0E59 and \$0ECF.
Input
A Character number (\$00-\$14)
(\$73) Minimum y-coordinate
(\$74) Maximum y-coordinate
(\$75) Minimum x-coordinate
(\$76) Maximum x-coordinate
Output
P Carry flag set if the character is within the coordinate range
\$0D67 CLC Store the base address of the character's buffer at \$4E.
\$0D68 ADC #\$78
\$0D6A STA \$4F
\$0D6C LDA #\$60
\$0D6E STA \$4E
\$0D70 LDY #\$01 Pick up the character's x-coordinate.
\$0D72 LDA (\$4E),Y
\$0D74 CMP \$75 Is it less than the minimum x-coordinate?
\$0D76 BCC \$0D8F Return with the carry flag reset if so.
\$0D78 INC \$76 Increment the maximum x-coordinate at \$76. (This is a bug.)
\$0D7A CMP \$76 Is the character's x-coordinate greater than the maximum x-coordinate?
\$0D7C BCS \$0D8F Return with the carry flag reset if so.
\$0D7E INY Pick up the character's y-coordinate.
\$0D7F LDA (\$4E),Y
\$0D81 CMP \$73 Is it less than the minimum y-coordinate?
\$0D83 BCC \$0D8F Return with the carry flag reset if so.
\$0D85 INC \$74 Increment the maximum y-coordinate at \$74. (This is a bug.)
\$0D87 CMP \$74 Is the character's y-coordinate greater than the maximum y-coordinate?
\$0D89 BCS \$0D8F Return with the carry flag reset if so.
\$0D8B SEC Return with the the carry flag set.
\$0D8C JMP \$0D90
\$0D8F CLC Clear the carry flag.
\$0D90 RTS
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