diff --git a/logic/basic_terminal.lua b/logic/basic_terminal.lua
index f8c3c78..4556ba2 100644
--- a/logic/basic_terminal.lua
+++ b/logic/basic_terminal.lua
@@ -222,7 +222,7 @@ local function renumber_lines(pos, nvm, code)
 	local num = 10
 	for line in code:gmatch("[^\r\n]+") do
 		local s = line:match("^%s*(%d+)")
-		if s and tonumber(s) < 65000 then
+		if s and tonumber(s) < 64000 then
 			lines[#lines + 1] = num .. line:sub(s:len() + 1)
 			new_nums[s] = num
 			num = num + 10
@@ -645,6 +645,11 @@ register_ext_function("iname$", {nanobasic.NB_STR}, nanobasic.NB_STR, function(p
 	return true
 end)
 
+register_ext_function("reset", {}, nanobasic.NB_NONE, function(pos, nvm)
+	nanobasic.reset(pos)
+	return true
+end)
+
 --
 -- Register user input actions: register_action(states, key, function)
 --
@@ -701,6 +706,7 @@ register_action({"init", "edit", "stopped"}, "Run", function(pos, nvm, fields)
 		nvm.bttns = {"", "", "", "", "", "Stop", "", ""}
 		nvm.input = ""
 		nvm.variables = nanobasic.get_variable_list(pos)
+		nvm.onload_label_addr = nanobasic.get_label_address(pos, "64000") or 0
 		nvm.error_label_addr = nanobasic.get_label_address(pos, "65000") or 0
 		nvm.ttl = nil
 		minetest.get_node_timer(pos):start(CYCLE_TIME)
@@ -820,6 +826,9 @@ techage.register_node({"techage:basic_terminal"}, {
 		nanobasic.vm_restore(pos)
 		local nvm = techage.get_nvm(pos)
 		if nvm.status == "running" then
+			if nvm.onload_label_addr and nvm.onload_label_addr > 0 then
+				nanobasic.set_pc(pos, nvm.onload_label_addr)
+			end
 			minetest.get_node_timer(pos):start(CYCLE_TIME)
 		end
 	end,
diff --git a/manuals/nanobasic.md b/manuals/nanobasic.md
index b671358..28df014 100644
--- a/manuals/nanobasic.md
+++ b/manuals/nanobasic.md
@@ -47,6 +47,7 @@
 	- [MID$](#mid)
 	- [PARAM](#param)
 	- [PARAM$](#param-1)
+	- [RESET](#reset)
 	- [RIGHT$](#right)
 	- [RND](#rnd)
 	- [SERCUR](#sercur)
@@ -58,6 +59,7 @@
 	- [VAL](#val)
 - [Techage Functions](#techage-functions)
 	- [Error Handling](#error-handling)
+	- [Mapblock Loading](#mapblock-loading)
 	- [CMD](#cmd)
 	- [CMD$](#cmd-1)
 	- [CHAT](#chat)
@@ -989,6 +991,18 @@ Example:
 10 val$ = PARAM$()
 ```
 
+### RESET
+
+Format:
+
+```text
+RESET()
+```
+
+The RESET function is used to reset the program to the first line.
+The function can be called at any time in the program. But the main use is to
+restart the program after the mapblock is loaded. See [Mapblock Loading](#mapblock-loading).
+
 ### RIGHT$
 
 Format:
@@ -1189,6 +1203,31 @@ and only in the error subroutine.
 
 After this subroutine is called, the program returns to the `CMD` or `CMD$` function.
 
+### Mapblock Loading
+
+When the world around the Techage Terminal is loaded and NanoBasic is active,
+the program is continued from the line where the program was interrupted.
+By means of the NanoBasic subroutine starting at line 64000, it is possible to
+define what should happen when the mapblock is loaded.
+
+This subroutine can be used to initialize the program and/or initialize connected
+Techage devices.
+
+In the easiest case, the on-load subroutine can be defined as follows:
+
+```text
+64000 PRINT "Mapblock loaded"
+64010 RETURN
+```
+
+To restart the program from the beginning, call the `RESET` function.
+The `RESET` function is used to reset the program to the first line.
+
+```text
+64000 PRINT "Mapblock loaded"
+64010 RESET()
+```
+
 ### CMD
 
 Format: