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Sentinel65X-Handbook
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Work on fleshing out sections

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Kyle Cardoza 2024-03-24 00:57:12 -04:00
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@ -209,6 +209,34 @@ Bits 4-5 encode the tile map width, while bits 6-7 encode the tile map height, a
The `L0_MAPBASE` register, located at `0x00DF0DE`, encodes the high 8 bits of the 17-bit address in VERA memory where the map data for layer 0 can be found; since the bottom 9 bits are implicitly `0`, this means the map data must always begin on a 512-byte alignment boundary. The `L0_MAPBASE` register, located at `0x00DF0DE`, encodes the high 8 bits of the 17-bit address in VERA memory where the map data for layer 0 can be found; since the bottom 9 bits are implicitly `0`, this means the map data must always begin on a 512-byte alignment boundary.
### L0_TILEBASE
The `L0_TILEBASE` register, located at `0x00DF0F`, encodes the following data:
- Bit 0 controls the pixel width of tiles in layer 0; a `0` value means that a tile is 8 pixels wide, while a `1` value means that tile is 16 pixels wide.
- Bit 1 controls the pixel height of tiles in layer 0; a `0` value means that a tile is 8 pixels tall, while a `1` value means that tile is 16 pixels tall.
- Bits 2-7 hold the top six bits of the 17-bit address in VERA memory where the tile data can be found; as bits 0-10 are implicitly `0`, this means that tile data is always aligned on a 2,048-byte boundary.
### L0_HSCROLL_L / L0_HSCROLL_H
The `L0_HSCROLL_L` and `L0_HSCROLL_H` registers, located at addresses `0x00DF10` and `0x00DF11`, encode the low order byte and high order 4 bits, respectively, of the layer 0 horizontal scroll value; this value ranges from 0 to 4,095, and is defined in terms of pixels.
### L0_VSCROLL_L / L0_VSCROLL_H
The `L0_VSCROLL_L` and `L0_VSCROLL_H` registers, located at addresses `0x00DF12` and `0x00DF13`, encode the low order byte and high order 4 bits, respectively, of the layer 0 vertical scroll value; this value ranges from 0 to 4,095, and is defined in terms of pixels.
### Layer 1 Registers
The layer 1 control registers function exactly as their equivalents for layer 0:
- `L1_CONFIG` located at `0x00DF14`
- `L1_MAPBASE` located at `0x00DF15`
- `L1_TILEBASE` located at `0x00DF16`
- `L1_HSCROLL_L` located at `0x00DF17`
- `L1_HSCROLL_H` located at `0x00DF18`
- `L1_VSCROLL_L` located at `0x00DF19`
- `L1_VSCROLL_H` located at `0x00DF1A`
## 16-Bit Reads/Writes ## 16-Bit Reads/Writes
With appropriate configuration of registers, it is possible to perform sequential 16-bit reads and writes to VERA address space: With appropriate configuration of registers, it is possible to perform sequential 16-bit reads and writes to VERA address space: