Hi Mark,
 
You assigned the LCD_BUSY to address 0C002H (LCD_BUSY EQU 0C002H),
and then made in program at least 4 mistakes as following: 
 
1) You are assigning again the name of LCD_BUSY to MACRO name LCD_BUSY (LCD_BUSY MACRO) but any name must be the unique name;
 
2) You are calling the LCD_BUSY as the simply subroutine but it is MACRO. The body of the macro LCD_BUSY is replaced by Assembly instead of name macro LCD_BUSY;
 
3) The last instruction in the body of the macro LCD_BUSY is instruction RET so the instructions after the body LCD_BUSY macro will not executed;
 
4) The macro must be ended by ENDM.
 
I hope my notes helps you a little.
 
By now,
 
Igor