code cleanup

src/basic/basic_commands/cmd_let.s

@@ -276,30 +276,12 @@ cmd_let_assign_string_try_reuse:
 
 	sec
 	lda DSCPNT+0
-	sbc __FAC1+0
-	bcc cmd_let_assign_string_try_reuse_unsuccesful
-	
+	cmp __FAC1+0
+
 	// If size of both string equals - simply reuse it
 
 	beq_16 helper_let_strvarcpy
 
-	// Old string is longer - if difference is at least 3 bytes, we can still reuse it
-
-	sbc #$03
-	bcc cmd_let_assign_string_try_reuse_unsuccesful
-
-	// New string is shorter - enought that we can still reuse the old one with a small trick
-/*
-	clc
-	adc DSCPNT+1
-	sta DSCPNT+1
-	bcs !+
-	inc DSCPNT+2
-*/
-	// XXX
-	// XXX implement this part
-	// XXX
-
 cmd_let_assign_string_try_reuse_unsuccesful:
 
 	// No special case optimization is possible - but first get rid of the old string

src/basic/basic_commands/helper_let_strvarcpy_38K.s

@@ -12,7 +12,6 @@
 helper_let_strvarcpy:
 
 	// Retrieve pointer to destination
-	// XXX this part is probably not needed
 
 	ldy #$02
 	lda (VARPNT), y

src/basic/basic_commands/helper_let_strvarcpy_46K_50K.s

@@ -19,7 +19,6 @@ helper_let_strvarcpy:
 	sta CPU_R6510
 
 	// Retrieve pointer to destination
-	// XXX this part is probably not needed
 
 	ldy #$02
 	lda (VARPNT), y
@@ -29,7 +28,7 @@ helper_let_strvarcpy:
 	sta DSCPNT+1
 	dey
 
-	// .Y is now 0 - copy the content
+	// Copy the string content
 !:
 	lda (__FAC1+1),y
 	sta (DSCPNT+1),y

src/basic/basic_commands/helper_let_strvarcpy_60K.s

@@ -14,7 +14,6 @@ helper_let_strvarcpy:
 	ldx #<VARPNT
 
 	// Retrieve pointer to destination
-	// XXX this part is probably not needed
 
 	ldy #$02
 	jsr peek_under_roms