started work on LET command

src/aliases/,aliases_ram_lowmem.s

@@ -46,7 +46,7 @@
 	.label DATLIN    = $3F // $3F-$40  -- NOT IMPLEMENTED --
 	.label DATPTR    = $41 // $41-$42  pointer for READ/DATA copmmands
 	.label INPPTR    = $43 // $43-$44  -- NOT IMPLEMENTED --
-	.label VARNAM    = $45 // $45-$46  -- NOT IMPLEMENTED --
+	.label VARNAM    = $45 // $45-$46  current variable name
 	.label VARPNT    = $47 // $47-$48  -- NOT IMPLEMENTED --
 	.label FORPNT    = $49 // $49-$4A  -- NOT IMPLEMENTED --
 	.label OPPTR     = $4B // $4B-$4C  helper variable for expression computation, [!] our usage details are different