Update README for TEOS v3.01 release.

Author: jbrandwood

README.md

@@ -12,14 +12,63 @@ TEOS
   (See the accompanying file LICENSE_1_0.txt or the copy at
         http://www.boost.org/LICENSE_1_0.txt)
 
+
 *****************************************************************************
 
 About
 -----
 
 This is a replacement Operating System for KRIKzz's Turbo Everdrive v2.
 
-It can either be run as a HuCard image, just like any game, or it can be used
-as a replacement for the default operating system file /TBED/OS.PCE
+Please do NOT try to use this on an old Turbo Everdrive v1, IT WILL NOT WORK!
+
+
+*****************************************************************************
+
+TEOS Release v3.01 (2022/06/12)
+-------------------------------
+
+Just extract the contents of the .ZIP file, and copy the extracted files to the root of your Turbo EverDrive's SD card.
+
+In particular ... the contents of the /TBED/ directory *must* go in that directory.
+
+If you have already got some files with the same name in your /TBED/ directory, then please do NOT overwrite those files, or you will lose your existing BRAM saves!
+
+
+Note that TEOS works both as a HuCARD image, and as a replacement for Krikzz's original Turbo Everdrive OS.
+
+* To run it as a HuCARD, just select and run TEOS.PCE from your existing Turbo Everdrive OS.
+* To replace Krikzz's original Turbo Everdrive OS with TEOS, just rename TEOS.PCE to OS.PCE and copy the OS.PCE file to the /TBED/ folder on your SD card.
+
+
+For Turbo GT (and Turbo Express) owners there is also a version of TEOS called TEOS-GT.PCE which avoids using the high-resolution text mode, and so is a bit more readable on their LCD screen.
+
+
+If you find any problems, then it would be better to report them in the "Homebrew Development" section of the "PC Engine Software Bible forum" (https://pcengine.proboards.com/board/5/homebrew-development), rather than cluttering up KRIKzz's official Turbo Everdrive forum.
+
+
+*****************************************************************************
+
+Changes since TEOS Beta 5 (2021/01/26)
+--------------------------------------
+
+* Support uploading HuCARD games to the TED2 through USB with either Krikzz's "turbo-usb2.exe", or Dave Shadoff's PCE_TurboEverdrive_USB (https://github.com/dshadoff/PCE_TurboEverdrive_USB).
+* Backup and restore NEC's Memory Base 128 (a.k.a. Koei's Save Kun) images to and from the TED2's SD card.
+* Enable the TED2's "Street Fighter 2" memory mapper for all HuCARDs larger than 1MByte, to allow for future homebrew games using the mapper.
+* Fix missing color in "Order of the Gryffon" password screen.
+
+
+*****************************************************************************
+
+Building a new TEOS from Source Code
+------------------------------------
+
+The source code for TEOS can be found on GITHUB at https://github.com/jbrandwood/teos
+
+You will need to use a recent version of the PCEAS assembler to successfully built TEOS.
+
+
+The PCEAS assembler is one component of the HuC project which can be found on GITHUB at https://github.com/jbrandwood/huc
+
 
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