Commit 1bf12573c8a2efe71f03019670a459017adf8b0d - x6502

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README less more

86	86	this flag, as some implementations of ncurses
87	87	will clear the display when the emulator exits.
88	88
	89	When outputting characters, you can control the
	90	``paint'' with which the characters are drawn. You can
	91	do so by modifying the PAINT flag at location 0xFEE8.
	92	Paints are an OR-ing of a color (bottom 4 bits) and a
	93	style (top 4 bits). Supported colors are:
	94
	95	PAINT_BLACK 0x00
	96	PAINT_RED 0x01
	97	PAINT_GREEN 0x02
	98	PAINT_YELLOW 0x03
	99	PAINT_BLUE 0x04
	100	PAINT_MAGENTA 0x05
	101	PAINT_CYAN 0x06
	102	PAINT_WHITE 0x07
	103
	104	Supported styles are:
	105
	106	PAINT_DIM 0x20
	107	PAINT_UNDERLINE 0x40
	108	PAINT_BOLD 0x80
	109
	110	Thus, as an example, an underlined, bold green character
	111	would have paint 0xC2.
	112
89	113	I/O devices:
90	114
91		The character output device is mapped to FF00. Any
	115	The character output device is mapped to 0xFF00. Any
92	116	character written to FF00 is immediately echoed to the
93	117	terminal.
94	118
95		The character input device is mapped to FF01. When a
	119	The character input device is mapped to 0xFF01. When a
96	120	character is available on standard in, an interrupt is
97	121	raised and FF01 is set to the character that was
98	122	received. Note that one character is delivered per

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io.c less more

10	10	#define VTERM_COLS 40
11	11
12	12	uint8_t io_modeflags = 0x00;
	13	uint8_t io_supports_paint;
13	14
14	15	WINDOW *window = NULL;
15	16

23	24	noecho();
24	25	nodelay(stdscr, TRUE);
25	26	keypad(stdscr, TRUE);
	27
	28	io_supports_paint = (has_colors() != FALSE);
	29	if (io_supports_paint) {
	30	start_color();
	31	for (int i = 0; i < 8; i++) {
	32	init_pair(i, i, COLOR_BLACK);
	33	}
	34	}
26	35	}
27	36
28	37	void finish_io() {

58	67	}
59	68	}
60	69
	70	void update_paint(uint8_t paint) {
	71	wattrset(window,
	72	COLOR_PAIR(paint & 0x0F) \|
	73	(paint & IO_PAINT_DIM ? A_DIM : 0) \|
	74	(paint & IO_PAINT_UNDERLINE ? A_UNDERLINE : 0) \|
	75	(paint & IO_PAINT_BOLD ? A_BOLD : 0));
	76	}
	77
61	78	void update_vterm(cpu *m, uint16_t dirty) {
62	79	uint16_t offset = dirty - IO_VTERM_START;
63	80	if (offset >= 1000) {

89	106	}
90	107	} else if (addr == IO_MODEFLAGS) {
91	108	update_modeflags(io_modeflags, m->mem[IO_MODEFLAGS]);
	109	} else if (addr == IO_PAINT) {
	110	update_paint(m->mem[addr]);
92	111	} else if (IO_VTERM_START <= addr && addr < IO_VTERM_END) {
93	112	update_vterm(m, addr);
94	113	}

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io.h less more

4	4	#define IO_PUTCHAR 0xFF00
5	5	#define IO_GETCHAR 0xFF01
6	6	#define IO_MODEFLAGS 0xFF02
	7	#define IO_PAINT 0xFEE8
7	8
8	9	#define IO_VTERM_START 0xFB00
9	10	#define IO_VTERM_END 0xFF00

11	12	#define IO_MODEFLAG_VTERM 0x01
12	13	#define IO_MODEFLAG_WAIT_HALT 0x02
13	14
	15	#define IO_PAINT_BLACK 0x00
	16	#define IO_PAINT_RED 0x01
	17	#define IO_PAINT_GREEN 0x02
	18	#define IO_PAINT_YELLOW 0x03
	19	#define IO_PAINT_BLUE 0x04
	20	#define IO_PAINT_MAGENTA 0x05
	21	#define IO_PAINT_CYAN 0x06
	22	#define IO_PAINT_WHITE 0x07
	23
	24	// bitwise-OR these with one of the colors to modify them
	25	#define IO_PAINT_DIM 0x20
	26	#define IO_PAINT_UNDERLINE 0x40
	27	#define IO_PAINT_BOLD 0x80
	28
14	29	void init_io();
15	30	void finish_io();
16	31	void handle_io(cpu *m);

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sample_programs/colors.s less more