Docs: Update todo list

notes/todo.md

@@ -16,9 +16,8 @@
 
 ## Design
 
-- [ ] Add keypad to memory map (see [dev note](2023-08-10--dev-notes.md))
-- [ ] [Replace CHP/CFC with FHP/FTG](2023-08-07--dev-notes.md)
 - [ ] Add a flag for bank-switching to the ~zero-page
+- [ ] Consider adding a VIP-style keypad-based machine code monitor
 
 ### For consideration
 
@@ -43,14 +42,13 @@
 
 ### Assembler
 
-- [ ] Support use of `*ADDR` with =constants
-- [ ] Pad up to 256 bytes
 - [ ] Validate labels
 - [ ] Return pure machine code when printing to stdout (and not in debug mode)
 
 ### CPU
 
-- [ ] Add single-stepping 
+- [/] Add single-stepping 
+    - [ ] Make it work with simulated keypad
 
 ### Possible under-the-hood improvements