Extract 16KB VRAM from 80KB RAM

[nesbox]

We could get additional 16KB of RAM to implement Sprite Flags, complete music commands, use Persistent memory with peek/poke and etc. without breaking compatibility.

[nesbox]

New separated memory layout (by the vram/ram commands)

+-----------------------------------+
|           16K VRAM LAYOUT         |
+-------+-------------------+-------+
| ADDR  | INFO              | SIZE  |
+-------+-------------------+-------+
| 00000 | SCREEN            | 16320 |
| 03FC0 | PALETTE           | 48    |
| 03FF0 | PALETTE MAP       | 8     |
| 03FF8 | BORDER            | 1     |
| 03FF9 | SCREEN OFFSET     | 2     |
| 03FFB | MOUSE CURSOR      | 1     |
| 03FFC | ...               | 4     |
+-------+-------------------+-------+

+-----------------------------------+
|           80K RAM LAYOUT          |
+-------+-------------------+-------+
| ADDR  | INFO              | SIZE  |
+-------+-------------------+-------+
| 04000 | TILES             | 8192  |
| 06000 | SPRITES           | 8192  |
| 08000 | MAP               | 32640 |
| 0FF80 | GAMEPADS          | 4     |
| 0FF84 | MOUSE             | 4     |
| 0FF88 | KEYBOARD          | 4     |
| 0FF8C | ...               | 16    |
| 0FF9C | SOUND REGISTERS   | 72    |
| 0FFE4 | WAVEFORMS         | 256   |
| 100E4 | SFX               | 4224  |
| 11164 | MUSIC PATTERNS    | 11520 |
| 13E64 | MUSIC TRACKS      | 408   |
| 13FFC | SOUND STATE       | 4     |
| 14000 | ...               | 16384 |
+-------+-------------------+-------+

[nesbox]

added sprite flags section here 528bb40
looks like this

[The-Beesh-Spweesh]

So, if you extracted the VRAM and made it have its own memory, do you have a possible memory layout for the main RAM's 0x0000~0x3FFF range?

[nesbox]

@StinkerB06 VRAM will be mapped to 0x0000~0x3FFF range

[nesbox]

   TIC80 memory schematic
   ======================

   ---------- 16K VRAM -----------
   
    .............  
   .-------------. 
   |     16K     | 
   '-------------' 
    '''''''''''''  

   ----------- 80K RAM -----------

    .............   .............  
   .-------------. .-------------. 
   |     16K     | |     16K     | 
   '-------------' '-------------' 
    '''''''''''''   '''''''''''''  
    .............   .............  
   .-------------. .-------------. 
   |     16K     | |     16K     | 
   '-------------' '-------------' 
    '''''''''''''   '''''''''''''  
    .............  
   .-------------. 
   |     16K     | 
   '-------------' 
    '''''''''''''  

[nesbox]

Added fget(index,flag) fset(index,flag,bool) api here a08fd71