Tiled graphics mode

Initialization functions for GRAPHIC 1, 2, and 3 mode. More...

Collaboration diagram for Tiled graphics mode:

Functions
void	screen1 (void)
	MSX SCREEN 1: WIDTH 32 (GRAPHIC 1 mode).
void	screen2 (void)
	MSX SCREEN 2: WIDTH 32 (GRAPHIC 2 mode).
void	screen2_PCG (void)
	MSX SCREEN 2: WIDTH 32 (GRAPHIC 2 mode; PCG mode like as SCREEN 1).
void	screen4 (void)
	MSX2 SCREEN 4: WIDTH 32 (GRAPHIC 3 mode).
void	screen4_PCG (void)
	MSX2 SCREEN 4: WIDTH 32 (GRAPHIC 3 mode; PCG mode like as SCREEN 1).

Detailed Description

Initialization functions for GRAPHIC 1, 2, and 3 mode.

Function Documentation

screen1()

void screen1

(

void

)

MSX SCREEN 1: WIDTH 32 (GRAPHIC 1 mode).

• 32 columns x 24 lines tiled graphics mode.
• Sprite mode 1.

VRAM memory map

VRAM address	size	contents
0x00000	0x0800	Pattern generator table
0x01800	0x0300	Pattern name table
0x01B00	0x0080	Sprite attribute table
0x02000	0x0020	Color table
0x03800	0x0300	Sprite pattern generator table

Note

Patterns can be defined for each 256-character fonts (pattern generator table in VRAM).

Colors can be defined for each 8-character group of 256-character fonts (color table in VRAM).

screen2()

void screen2

(

void

)

MSX SCREEN 2: WIDTH 32 (GRAPHIC 2 mode).

• 32 columns x 24 lines tiled graphics mode.
• Sprite mode 1.

VRAM memory map

VRAM address	size	contents
0x00000	0x1800	Pattern generator table
0x01800	0x0300	Pattern name table
0x01B00	0x0080	Sprite attribute table
0x02000	0x1800	Color table
0x03800	0x0300	Sprite pattern generator table

The pattern name table is initialized as follows and will not be changed thereafter:

c
  uint8_t pattern_name_table[0x0300] = {
    0x00, 0x01, ..., 0xff,  // (0, 0) .. (31, 7) ; top of screen
    0x00, 0x01, ..., 0xff,  // (0, 8) .. (31,15) ; middle of screen
    0x00, 0x01, ..., 0xff,  // (0,16) .. (31,23) ; bottom of screen
  };

The pattern generator table and color table are then used as the canvas for the graphics screen. Thus, the characters in the text are also drawn as images one by one. Thus, the text will be more colorful, but a little slower.

Note

In this mode, text is drawn as individual color text. (i.e., text is drawn as a two-tone color graphic).

screen2_PCG()

void screen2_PCG

(

void

)

MSX SCREEN 2: WIDTH 32 (GRAPHIC 2 mode; PCG mode like as SCREEN 1).

• 32 columns x 24 lines tiled graphics mode.
• Sprite mode 1.

VRAM memory map

VRAM address	size	contents
0x00000	0x1800	Pattern generator table
0x01800	0x0300	Pattern name table
0x01B00	0x0080	Sprite attribute table
0x02000	0x1800	Color table
0x03800	0x0300	Sprite pattern generator table

Note

For each 256-character font, three patterns/colors can be defined for the top, middle, and bottom of the screen (pattern generator table and color table in VRAM).

a.k.a. SCREEN 1.5

screen4()

void screen4

(

void

)

MSX2 SCREEN 4: WIDTH 32 (GRAPHIC 3 mode).

• 32 columns x 24 lines tiled graphics mode.
• Sprite mode 2.

VRAM memory map

VRAM address	size	contents
0x00000	0x1800	Pattern generator table
0x01800	0x0300	Pattern name table
0x01C00	0x0200	Sprite color table
0x01E00	0x0080	Sprite attribute table
0x02000	0x1800	Color table
0x03800	0x0300	Sprite pattern generator table

The pattern name table is initialized as follows and will not be changed thereafter:

c
  uint8_t pattern_name_table[0x0300] = {
    0x00, 0x01, ..., 0xff,  // (0, 0) .. (31, 7) ; top of screen
    0x00, 0x01, ..., 0xff,  // (0, 8) .. (31,15) ; middle of screen
    0x00, 0x01, ..., 0xff,  // (0,16) .. (31,23) ; bottom of screen
  };

The pattern generator table and color table are then used as the canvas for the graphics screen. Thus, the characters in the text are also drawn as images one by one. Thus, the text will be more colorful, but a little slower.

Note

In this mode, text is drawn as individual color text. (i.e., text is drawn as a two-tone color graphic).

screen4_PCG()

void screen4_PCG

(

void

)

MSX2 SCREEN 4: WIDTH 32 (GRAPHIC 3 mode; PCG mode like as SCREEN 1).

• 32 columns x 24 lines tiled graphics mode.
• Sprite mode 2.

VRAM memory map

VRAM address	size	contents
0x00000	0x1800	Pattern generator table
0x01800	0x0300	Pattern name table
0x01C00	0x0200	Sprite color table
0x01E00	0x0080	Sprite attribute table
0x02000	0x1800	Color table
0x03800	0x0300	Sprite pattern generator table

Note

For each 256-character font, three patterns/colors can be defined for the top, middle, and bottom of the screen (pattern generator table and color table in VRAM).