mirror of
https://github.com/curioustorvald/tsvm.git
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130 lines
3.5 KiB
Plaintext
130 lines
3.5 KiB
Plaintext
1 byte = 2 pixels
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560x448@4bpp = 125 440 bytes
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560x448@8bpp = 250 880 bytes
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-> 262144 bytes (256 kB)
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[USER AREA | HW AREA]
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Number of pheripherals = 8, of which the computer itself is considered as
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a peripheral.
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HW AREA = [Peripherals | MMIO | INTVEC]
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User area: 8 MB, hardware area: 8 MB
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8192 kB
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User Space
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1024 kB
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Peripheral #8
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1024 kB
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Peripheral #7
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...
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1024 kB (where Peripheral #0 would be)
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MMIO and Interrupt Vectors
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128 kB
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MMIO for Peri #8
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128 kB
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MMIO for Peri #7
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...
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128 kB (where Peripheral #0 would be)
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MMIO for the computer
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130816 bytes
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MMIO for Ports, etc.
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256 bytes
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Vectors for 64 interrupts
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--------------------------------------------------------------------------------
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IO Device
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Endianness: little
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Note: Always takes up the peripheral slot of zero
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MMIO
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0..31 RO: Raw Keyboard Buffer read. Won't shift the key buffer
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32..33 RO: Mouse X pos
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34..35 RO: Mouse Y pos
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36 RO: Mouse down? (1 for TRUE, 0 for FALSE)
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37 RW: Read/Write single key input. Key buffer will be shifted. Manual writing is
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usually unnecessary as such action must be automatically managed via LibGDX
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input processing.
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38 RW: Request keyboard input be read. Write nonzero value to enable, write zero to
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close it. Keyboard buffer will be cleared whenever request is received, so
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MAKE SURE YOU REQUEST THE KEY INPUT ONLY ONCE!
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64..67 RO: User area memory size in bytes
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--------------------------------------------------------------------------------
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VRAM Bank 0 (256 kB)
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Endianness: little
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From the start of the memory space:
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250880 bytes
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Framebuffer
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3 bytes
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*reserved for future use*
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1 byte
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command (writing to this memory address changes the status)
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1: reset palette to default
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2: fill framebuffer with given colour (arg1)
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2 bytes
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argument for "command" (arg1: Byte, arg2: Byte)
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write to this address FIRST and then write to "command" to execute the command
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86 bytes
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*Unused*
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IF graphics_mode THEN
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(41 sprites : 260 bytes each -> 10660 bytes)
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0th sprite is always the GUI cursor
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2 bytes
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Ob hv0000xy yyyyyyyy (h: horizontal flip, v: vertical flip, x: show/hide, y: y-position)
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2 bytes
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0b rr0000xx xxxxxxxx (r: rotation, x: x-position)
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256 bytes
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16x16 texture for the sprite
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ELSE
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2978 bytes
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*Unused*
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2 bytes
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Cursor position in: (y*32 + x)
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2560 bytes
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Text foreground colours
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2560 bytes
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Text background colours
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2560 bytes
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Text buffer of 70x32 (8x14 character size, and yes: actual character data is on the bottom)
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FI
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512 bytes
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Palette stored in following pattern: 0b rrrr gggg, 0b bbbb aaaa, ....
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Palette number 255 is always full transparent (bits being all zero)
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MMIO
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0..1 RO
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Framebuffer width in pixels
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2..3 RO
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Framebuffer height in pixels
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4 RO
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Text mode columns
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5 RO
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Text mode rows
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6 RW
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Text-mode attributes
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0b kkkk 00rc (k: currently using character rom, r: TTY Raw mode, c: Cursor blink)
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7 RW
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Graphics-mode attributes
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0b 0000 000g (g: Use sprites(wipes out text buffer))
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8 RO
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Last used colour (set by poking at the framebuffer)
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9 RW
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current TTY foreground colour (useful for print() function)
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10 RW
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current TTY background colour (useful for print() function)
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Text-mode-font-ROM is immutable and does not belong to VRAM
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Even in the text mode framebuffer is still being drawn onto the screen, and the texts are drawn on top of it |