37 lines
1.7 KiB
Markdown
37 lines
1.7 KiB
Markdown
## Boot ROM
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Execution starts here, at address `$0000`.
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The OS bootloader is located here.
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## GPIO
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Contains hardware multiplication (`$0400`-`$0401`) and division (`$0402`-`$0403`), popcount (`$0404`), and a timer (`$0405`).
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## Keyboard
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Read address `$0500` to get the next key event (7-bit Windows VKey code, MSB on indicates press/release). Returns 0 if empty.
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Write 1 to `$0500` to enable interrupts.
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## Serial Peripheral Interface
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Not yet implemented.
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## Robot Controller
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Not directly mentioned in the provided code snippets, but if it follows a similar addressing scheme, it would have a specific range not covered here.
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## Text Display
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Write ASCII values to addresses `$0800` to `$0FFF` to display characters at certain positions on the screen.
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`$0800` is the top left, `$0FFF` would be the bottom right, considering the character display dimensions and memory layout.
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## Text Display Color
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Write 6-bit color IDs to addresses `$0800` to `$0FFF` to set the color of characters on screen.
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MSB = whether to invert character mask (i.e., for highlighting). This might need clarification or correction based on the actual implementation, as it seems to overlap with the Text Display's address range.
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## System RAM
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The OS may use this memory for the stack, system variables, etc., located at `$1000` to `$1FFF`.
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## User ROM
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Your program and data go here, located at `$2000` to `$2FFF`.
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## User RAM
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Your code can use this memory for variables, arrays, a heap, etc., located at `$3000` to `$3FFF`.
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## Video Display
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Not directly mentioned in the provided snippets for addressing, but based on the peripheral configuration, it would be addressed from `$8000` to `$FFFF` for direct pixel manipulation or other video-related functions.
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