mirror of
https://github.com/curioustorvald/tsvm.git
synced 2026-03-07 11:51:49 +09:00
92 lines
2.1 KiB
Plaintext
92 lines
2.1 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
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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
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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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VRAM Bank 0 (256 kB)
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From the end of the memory space:
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512 bytes
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Stored in following pattern: 0b rrrr gggg, 0b bbbb aaaa, ....
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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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256 bytes
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16x16 texture for the sprite
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2 bytes
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0b rr0000xx xxxxxxxx (r: rotation, x: x-position)
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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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ELSE
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2240 bytes
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Text buffer of 70x32 (8x14 character size)
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2240 bytes
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Text background colours
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2240 bytes
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Text foreground colours
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2 bytes
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Cursor position in: (y*32 + x)
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3938 bytes
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*Unused*
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FI
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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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92 bytes
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*Unused*
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MMIO
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2 bytes RO
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Framebuffer width in pixels
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2 bytes RO
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Framebuffer height in pixels
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1 bytes RO
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Text mode columns
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1 bytes RO
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Text mode rows
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1 bytes RW
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Text-mode attributes
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0b 0000 000c (c: Cursor blink)
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1 bytes 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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1 bytes RO
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Last used colour (set by poking at the framebuffer)
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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 |