From f179bf3f41d66d4b3c6b92dd97a28ef12a77414b Mon Sep 17 00:00:00 2001
From: Izaya Orihara <redtailedairways@gmail.com>
Date: Sun, 11 Dec 2016 11:19:37 +1100
Subject: [PATCH] Added some basic info on usage of the T400

---
 README.md | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/README.md b/README.md
index 9ff6754..2b5eb50 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,15 @@
 # test3d
 Low-tech computing for Minetest
+## T400 instructions
+TOS = top of stack
+
+| ins	 | function			|    mnemonic	|
+|--------|------------------------------|---------------|
+|4095	 | duplicate TOS		| dup		|
+|4094	 | swap TOS			| swp		|
+|4093	 | read memory from TOS		| read		|
+|4092	 | write to memory from TOS	| write		|
+|4091	 | add TOS			| add		|
+|4090	 | suptract TOS			| sub		|
+|4089	 | jump to TOS			| jmp		|
+|4088	 | skip if TOS = zero		| sez		|