[doc] Update progress

README.md

@@ -5,12 +5,19 @@ This is a play at emulating a BytePusher machine.
 
 ## Status
 
-- [X] RAM
+- [ ] MMU
+  - [X] RAM
+  - [ ] Mapped I/O
+    - [X] Program counter
+    - [X] Framebuffer
+    - [ ] Audio sample data
 - [X] Color
 - [ ] CPU
+  - [ ] Inner loop
+  - [ ] Outer loop
 - [ ] Keyboard
-- [ ] Display
-
+- [ ] Display adapter
+- [ ] Load/Save memory
 ## More information about the BytePusher VM
 
 https://esolangs.org/wiki/BytePusher