more work on inserting and deleting BASIC lines.

c64/basic/under_rom_routines.s

@@ -21,43 +21,6 @@ install_ram_routines:
 
 	rts
 
-basic_shift_mem_up_and_relink:
-	;; Shift memory up from basic_current_line_ptr
-	;; X bytes.
-
-	;; Work out end point of destination
-	txa
-	clc
-	adc basic_end_of_text_ptr+0
-	sta memmove_dst+0
-	lda basic_end_of_text_ptr+1
-	adc #0
-	sta memmove_dst+1
-	;; End point of source is just current end of BASIC text
-	lda basic_end_of_text_ptr+0
-	sta memmove_src
-	lda basic_end_of_text_ptr+1
-	sta memmove_src+1
-
-	;; Work out size of region to copy
-	lda basic_end_of_text_ptr+1
-	sec
-	sbc basic_current_line_ptr+1
-	sta memmove_size+1
-	lda basic_end_of_text_ptr+0
-	sbc #0
-	sta memmove_size+0
-
-	;; To make life simple for the copy routine that lives in RAM,
-	;; we have to adjust the end pointers down one page and set Y to the low
-	;; byte of the copy size.
-	tay
-	dec memmove_src+1
-	dec memmove_dst+1
-
-	;; Do the copy
-	jmp shift_mem_up
-	
 ram_routines_start:	
 
 tiny_nmi_handler_routine: