reached target granularity in screen code

c64/kernal/screen/screen_get_current_line_logical_length.s

@@ -0,0 +1,11 @@
+
+screen_get_current_line_logical_length:
+	ldy TBLX
+	lda LDTBL,y
+	bpl !+
+	lda #79
+	.byte $2c 		// BIT absolute mode, which we use to skip the next two instruction bytes
+!:
+	lda #39
+	sta LNMX
+	rts