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Audio & Video.md
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@ -52,252 +52,6 @@ The A/V port is a 24-pin female pin header, with a pin and row pitch of 2.54mm.
VERA is configured and controlled using a series of 32 memory-mapped I/O registers, located in the address space from `0x00DF00` to `0x00DF1F`.
<table>
<tr>
<th>Addr</th>
<th>Name</th>
<th>Bit&nbsp;7</th>
<th>Bit&nbsp;6</th>
<th>Bit&nbsp;5 </th>
<th>Bit&nbsp;4</th>
<th>Bit&nbsp;3 </th>
<th>Bit&nbsp;2</th>
<th>Bit&nbsp;1 </th>
<th>Bit&nbsp;0</th>
</tr>
<tr>
<td><pre>0x00DF00</pre></td>
<td>ADDRx_L (x=ADDRSEL)</td>
<td colspan="8" align="center">VRAM Address (7:0)</td>
</tr>
<tr>
<td>`0x00DF01`</td>
<td>ADDRx_M (x=ADDRSEL)</td>
<td colspan="8" align="center">VRAM Address (15:8)</td>
</tr>
<tr>
<td>`0x00DF02`</td>
<td>ADDRx_H (x=ADDRSEL)</td>
<td colspan="4" align="center">Address Increment</td>
<td colspan="1" align="center">DECR</td>
<td colspan="2" align="center">-</td>
<td colspan="1" align="center">VRAM Address (16)</td>
</tr>
<tr>
<td>`0x00DF03`</td>
<td>DATA0</td>
<td colspan="8" align="center">VRAM Data port 0</td>
</tr>
<tr>
<td>$04</td>
<td>DATA1</td>
<td colspan="8" align="center">VRAM Data port 1</td>
</tr>
<tr>
<td>$05</td>
<td>CTRL</td>
<td colspan="1" align="center">Reset</td>
<td colspan="5" align="center">-</td>
<td colspan="1" align="center">DCSEL</td>
<td colspan="1" align="center">ADDRSEL</td>
</tr>
<tr>
<td>$06</td>
<td>IEN</td>
<td colspan="1" align="center">IRQ Line (8)</td>
<td colspan="1" align="center">Scan Line (8)</td>
<td colspan="2" align="center">-</td>
<td colspan="1" align="center">AFLOW</td>
<td colspan="1" align="center">SPRCOL</td>
<td colspan="1" align="center">LINE</td>
<td colspan="1" align="center">VSYNC</td>
</tr>
<tr>
<td>$07</td>
<td>ISR</td>
<td colspan="4" align="center">Sprite collissions</td>
<td colspan="1" align="center">AFLOW</td>
<td colspan="1" align="center">SPRCOL</td>
<td colspan="1" align="center">LINE</td>
<td colspan="1" align="center">VSYNC</td>
</tr>
<tr>
<td>$08</td>
<td>IRQLINE_L (Write only)</td>
<td colspan="8" align="center">IRQ line (7:0)</td>
</tr>
<tr>
<td>$08</td>
<td>SCANLINE_L (Read only)</td>
<td colspan="8" align="center">Scan line (7:0)</td>
</tr>
<tr>
<td>$09</td>
<td>DC_VIDEO (DCSEL=0)</td>
<td colspan="1" align="center">Current Field</td>
<td colspan="1" align="center">Sprites Enable</td>
<td colspan="1" align="center">Layer1 Enable</td>
<td colspan="1" align="center">Layer0 Enable</td>
<td colspan="1" align="center">-</td>
<td colspan="1" align="center">Chroma Disable</td>
<td colspan="2" align="center">Output Mode</td>
</tr>
<tr>
<td>$0A</td>
<td>DC_HSCALE (DCSEL=0)</td>
<td colspan="8" align="center">Active Display H-Scale</td>
</tr>
<tr>
<td>$0B</td>
<td>DC_VSCALE (DCSEL=0)</td>
<td colspan="8" align="center">Active Display V-Scale</td>
</tr>
<tr>
<td>$0C</td>
<td>DC_BORDER (DCSEL=0)</td>
<td colspan="8" align="center">Border Color</td>
</tr>
<tr>
<td>$09</td>
<td>DC_HSTART (DCSEL=1)</td>
<td colspan="8" align="center">Active Display H-Start (9:2)</td>
</tr>
<tr>
<td>$0A</td>
<td>DC_HSTOP (DCSEL=1)</td>
<td colspan="8" align="center">Active Display H-Stop (9:2)</td>
</tr>
<tr>
<td>$0B</td>
<td>DC_VSTART (DCSEL=1)</td>
<td colspan="8" align="center">Active Display V-Start (8:1)</td>
</tr>
<tr>
<td>$0C</td>
<td>DC_VSTOP (DCSEL=1)</td>
<td colspan="8" align="center">Active Display V-Stop (8:1)</td>
</tr>
<tr>
<td>$0D</td>
<td>L0_CONFIG</td>
<td colspan="2" align="center">Map Height</td>
<td colspan="2" align="center">Map Width</td>
<td colspan="1" align="center">T256C</td>
<td colspan="1" align="center">Bitmap Mode</td>
<td colspan="2" align="center">Color Depth</td>
</tr>
<tr>
<td>$0E</td>
<td>L0_MAPBASE</td>
<td colspan="8" align="center">Map Base Address (16:9)</td>
</tr>
<tr>
<td>$0F</td>
<td>L0_TILEBASE</td>
<td colspan="6" align="center">Tile Base Address (16:11)</td>
<td colspan="1" align="center">Tile Height</td>
<td colspan="1" align="center">Tile Width</td>
</tr>
<tr>
<td>$10</td>
<td>L0_HSCROLL_L</td>
<td colspan="8" align="center">H-Scroll (7:0)</td>
</tr>
<tr>
<td>$11</td>
<td>L0_HSCROLL_H</td>
<td colspan="4" align="center">-</td>
<td colspan="8" align="center">H-Scroll (11:8)</td>
</tr>
<tr>
<td>$12</td>
<td>L0_VSCROLL_L</td>
<td colspan="8" align="center">V-Scroll (7:0)</td>
</tr>
<tr>
<td>$13</td>
<td>L0_VSCROLL_H</td>
<td colspan="4" align="center">-</td>
<td colspan="8" align="center">V-Scroll (11:8)</td>
</tr>
<tr>
<td>$14</td>
<td>L1_CONFIG</td>
<td colspan="2" align="center">Map Height</td>
<td colspan="2" align="center">Map Width</td>
<td colspan="1" align="center">T256C</td>
<td colspan="1" align="center">Bitmap Mode</td>
<td colspan="2" align="center">Color Depth</td>
</tr>
<tr>
<td>$15</td>
<td>L1_MAPBASE</td>
<td colspan="8" align="center">Map Base Address (16:9)</td>
</tr>
<tr>
<td>$16</td>
<td>L1_TILEBASE</td>
<td colspan="6" align="center">Tile Base Address (16:11)</td>
<td colspan="1" align="center">Tile Height</td>
<td colspan="1" align="center">Tile Width</td>
</tr>
<tr>
<td>$17</td>
<td>L1_HSCROLL_L</td>
<td colspan="8" align="center">H-Scroll (7:0)</td>
</tr>
<tr>
<td>$18</td>
<td>L1_HSCROLL_H</td>
<td colspan="4" align="center">-</td>
<td colspan="8" align="center">H-Scroll (11:8)</td>
</tr>
<tr>
<td>$19</td>
<td>L1_VSCROLL_L</td>
<td colspan="8" align="center">V-Scroll (7:0)</td>
</tr>
<tr>
<td>$1A</td>
<td>L1_VSCROLL_H</td>
<td colspan="4" align="center">-</td>
<td colspan="8" align="center">V-Scroll (11:8)</td>
</tr>
<tr>
<td>$1B</td>
<td>AUDIO_CTRL</td>
<td colspan="1" align="center">FIFO Full / FIFO Reset</td>
<td colspan="1" align="center">FIFO Empty</td>
<td colspan="1" align="center">16-Bit</td>
<td colspan="1" align="center">Stereo</td>
<td colspan="4" align="center">PCM Volume</td>
</tr>
<tr>
<td>$1C</td>
<td>AUDIO_RATE</td>
<td colspan="8" align="center">PCM Sample Rate</td>
</tr>
<tr>
<td>$1D</td>
<td>AUDIO_DATA</td>
<td colspan="8" align="center">Audio FIFO data (write-only)</td>
</tr>
<tr>
<td>$1E</td>
<td>SPI_DATA</td>
<td colspan="8" align="center">Data</td>
</tr>
<tr>
<td>$1F</td>
<td>SPI_CTRL</td>
<td colspan="1" align="center">Busy</td>
<td colspan="4" align="center">-</td>
<td colspan="1" align="center">Auto-tx</td>
<td colspan="1" align="center">Slow clock</td>
<td colspan="1" align="center">Select</td>
</tr>
</table>
## VERA Memory
VERA implements 128KB of internal memory, which exists in its own independent address space, connected to the CPU's address space through address and data registers. This RAM's address space is numbered from `0x00000` to `0x1FFFF`, and is organized as in the following table: