some preparations for string variables, added BASIC command COLD

src/basic/memory/shift_mem_adapt_pointers.s

@@ -9,13 +9,13 @@
 
 shift_mem_adapt_pointers:
 
-	sty RESHO+4
+	sty memmove__tmp
 
 	// Adapt source pointer
 
 	sec
 	lda memmove__src+0
-	sbc RESHO+4
+	sbc memmove__tmp
 	sta memmove__src+0
 	bcs !+
 	dec memmove__src+1
@@ -24,7 +24,7 @@ shift_mem_adapt_pointers:
 
 	sec
 	lda memmove__dst+0
-	sbc RESHO+4
+	sbc memmove__tmp
 	sta memmove__dst+0
 	bcs !+
 	dec memmove__dst+1

src/basic/memory/shift_mem_aliases.s

@@ -0,0 +1,9 @@
+
+//
+// Aliases for memory locations for memory block copy routines
+//
+
+.label memmove__src    = INDEX+2
+.label memmove__dst    = RESHO+0
+.label memmove__size   = RESHO+2
+.label memmove__tmp    = RESHO+4

src/basic/memory/shift_mem_down.s

@@ -11,7 +11,7 @@
 // - memmove__dst  - pointer to the first byte of destination
 // - memmove__size - number of bytes to copy
 //
-// All the input variables, .A, and .Y register, are destroyed. Also uses RESHO+4 variable.
+// All the input variables, .A, and .Y register, are destroyed. Also uses memmove__tmp variable.
 //
 
 

src/basic/memory/shift_mem_up.s

@@ -11,7 +11,7 @@
 // - memmove__dst  - pointer to the last byte of destination
 // - memmove__size - number of bytes to copy
 //
-// All the input variables, .A, and .Y register, are destroyed. Also uses RESHO+4 variable.
+// All the input variables, .A, and .Y register, are destroyed. Also uses memmove__tmp variable.
 //