Update README to reflect beta features

README.md

@@ -1,17 +1,54 @@
-DRÖM
-====
+Daterad Rekreationell Övnings-Mikrodator
+========================================
 
-DRÖM ("DREAM" in Swedish) is an emulator for the DREAM 6800 home computer, powered by [LÖVE](https://love2d.org). It's a work in progress.
+DRÖM ("DREAM" in Swedish) is an emulator for the CHIP-8-based DREAM 6800 home computer, powered by [LÖVE](https://love2d.org) and [Moon6800](https://github.com/tobiasvl/moon6800).
+
+Features
+--------
+
+* Faithful emulation of the DREAM
+* 4K of RAM
+* Can quickload and play CHIP-8 games
+* Includes software:
+  * Michael J. Bauer's original CHIPOS monitor program
+  * Michael J. Bauer's DREAM INVADERS game
+* A comprehensive debug interface, powered by [love-imgui](https://github.com/slages/love-imgui)
+* CRT shaders!
+
+A very special thanks to Michael J. Bauer who permitted me to include the original software.
+
+Memory map
+----------
+
+| Address range  | Contents       |
+|----------------|----------------|
+| `0000` - `03FF`| RAM            |
+| `8010` - `8011`| PIA A (keypad) |
+| `8012` - `8013`| PIA B (speaker & cassette) |
+| `C000` - `C3FF`| EPROM          |
+| `C400` - `FFFF`| Mirrored EPROM |
+
+CHIPOS
+------
+
+When CHIPOS starts up, it will display an address at the bottom of the screen.
+
+First, type a 4-digit hexadecimal number to enter a memory address.
+
+Then execute one of the following commands:
+
+* FN, 0: MEMOD (MEMory MODify): The contents of the address will be displayed as a 2-digit hexadecimal number. Type a new 2-digit number to replace the memory contents. The memory address will automatically advance by one. You can also press FN to advance one byte without modifying anyting.
+* FN, 3: Run: Executes a program starting at the current address. To run a CHIP-8 program (which is loaded at address `0200`), run the CHIP-8 interpreter at `C000`.
+
+Loading (FN, 1) and dumping (FN, 2) cassettes isn't supported yet, but instead you can use the "File" menu to quickload CHIP-8 games or DREAM INVADERS.
+
+At any time, press RESET to return to the monitor program.
 
 History
 -------
 
-The DREAM 6800 (Domestic Recreational Educational and Adaptive Microcomputer) was a Motorola 6800-based microcomputer created by Michael J. Bauer. Its construction was detailed in _Electronics Australia_ in 1979, and it included a monitor program called CHIPOS (Compact Hexadecimal Interpretive Programming and Operating System). It had its own newsletter, [DREAMER](https://archive.org/search.php?query=creator%3A%22N.S.W.+6800+Users+Group%22), published between 1980 and 1982. You can read more about the DREAM's history on Michael's official [DREAM 6800 Archive Site](http://www.mjbauer.biz/DREAM6800.htm).
-
-Requirements
-------------
+The DREAM 6800 (Domestic Recreational Educational and Adaptive Microcomputer) was a Motorola 6800-based microcomputer created by Michael J. Bauer. Its construction was detailed in _Electronics Australia_ in 1979, and it included a monitor program called CHIPOS (Compact Hexadecimal Interpretive Programming and Operating System) and a CHIP-8 interpreter.
 
-When it's done, I will release executables. Until then, running it requires the following:
+It had its own newsletter, [DREAMER](https://archive.org/search.php?query=creator%3A%22N.S.W.+6800+Users+Group%22), published between 1980 and 1982.
 
-* [LÖVE](https://love2d.org) (developed with version 11.3, but probably runs on older versions)
-* [love-imgui](https://github.com/slages/love-imgui)
+You can read more about the DREAM's history on Michael's official [DREAM 6800 Archive Site](http://www.mjbauer.biz/DREAM6800.htm).