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■ Bitmap pattern

VRAM capacity required per bitmap pattern varies depending on the bitmap size and the number of bitmap colors (bitmap pattern data size). In addition, the data structure of each bitmap pattern stored in VRAM changes in the same way. The bitmap size and the number of bitmap colors can be set to exceed the VRAM capacity, but in this case, the same picture is repeated vertically. The bitmap pattern capacity is shown in Table 4.11 and the bitmap pattern configuration is shown in Figure 4.17.
∙ The boundary for storing the bitmap pattern in VRAM in VRAM is 20000H regardless of the bitmap size and the number of bitmap colors, and the designation is made in the map offset register.

Table 4.11 Bitmap pattern capacity per page
Bitmap
Size 		Bitmap pattern
Data size 		Number of bitmap colors Capacity per side
512 horizontal dots x
256 vertical dots 		4 bits / dot 16 colors 64K bytes (512K bits)
8 bits / dot 256 colors 128K bytes (1M bit)
16 bits / dot 2048 colors, 32768 colors 256K bytes (2M bits)
32 bits / dot 16.77 million colors 512K bytes (4M bits)
512 horizontal dots x
512 vertical dots 		4 bits / dot 16 colors 128K bytes (1M bit)
8 bits / dot 256 colors 256K bytes (2M bits)
16 bits / dot 2048 colors, 32768 colors 512K bytes (4M bits)
32 bits / dot 16.77 million colors 1024K bytes (8M bits)
Width 1024 dots x
Length 256 dots 		4 bits / dot 16 colors 128K bytes (1M bit)
8 bits / dot 256 colors 256K bytes (2M bits)
16 bits / dot 2048 colors, 32768 colors 512K bytes (4M bits)
32 bits / dot 16.77 million colors 1024K bytes (8M bits)
Width 1024 dots x
Length 512 dots 		4 bits / dot 16 colors 256K bytes (2M bits)
8 bits / dot 256 colors 512K bytes (4M bits)
16 bits / dot 2048 colors, 32768 colors 1024 Kbytes (8 Mbit)

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