1 byte = 2 pixels

560x448@4bpp = 125 440 bytes
560x448@8bpp = 250 880 bytes

-> 262144 bytes (256 kB)

[USER AREA | HW AREA]

    Number of pheripherals = 8, of which the computer itself is considered as
     a peripheral.

HW AREA = [Peripherals | MMIO | INTVEC]

User area: 8 MB, hardware area: 8 MB

8192 kB
    User Space
1024 kB
    Peripheral #8
1024 kB
    Peripheral #7
...
1024 kB
    MMIO and Interrupt Vectors
    128 kB
        MMIO for Peri #8
    128 kB
        MMIO for Peri #7
    ...
    128 kB
        MMIO for the computer
        130816 bytes
            MMIO for Ports, etc.
        256 bytes
            Vectors for 64 interrupts

--------------------------------------------------------------------------------

VRAM Bank 0 (256 kB)

From the end of the memory space:
512 bytes
    Stored in following pattern: 0b rrrr gggg, 0b bbbb aaaa, ....
IF graphics_mode THEN
    (41 sprites : 260 bytes each -> 10660 bytes)
        0th sprite is always the GUI cursor
    256 bytes
        16x16 texture for the sprite
    2 bytes
        0b rr0000xx xxxxxxxx (r: rotation, x: x-position)
    2 bytes
        Ob hv0000xy yyyyyyyy (h: horizontal flip, v: vertical flip, x: show/hide, y: y-position)
ELSE
    2240 bytes
        Text buffer of 70x32 (8x14 character size)
    2240 bytes
        Text background colours
    2240 bytes
        Text foreground colours
    2 bytes
        Cursor position in: (y*32 + x)
    3938 bytes
        *Unused*
FI
From the start of the memory space:
250880 bytes
    Framebuffer
92 bytes
    *Unused*

MMIO

2 bytes RO
    Framebuffer width in pixels
2 bytes RO
    Framebuffer height in pixels
1 bytes RO
    Text mode columns
1 bytes RO
    Text mode rows
1 bytes RW
    Text-mode attributes
    0b 0000 000c (c: Cursor blink)
1 bytes RW
    Graphics-mode attributes
    0b 0000 000g (g: Use sprites(wipes out text buffer))
1 bytes RO
    Last used colour (set by poking at the framebuffer)

Text-mode-font-ROM is immutable and does not belong to VRAM
Even in the text mode framebuffer is still being drawn onto the screen, and the texts are drawn on top of it