2 Skelton for retropc emulator
4 Author : Takeda.Toshiya
14 #ifndef MC6847_VRAM_OFS
15 #define MC6847_VRAM_OFS 0
34 static const uint8_t intfont[64 * 12] = {
35 0x00, 0x00, 0x38, 0x44, 0x04, 0x34, 0x4C, 0x4C, 0x38, 0x00, 0x00, 0x00,
36 0x00, 0x00, 0x10, 0x28, 0x44, 0x44, 0x7C, 0x44, 0x44, 0x00, 0x00, 0x00,
37 0x00, 0x00, 0x78, 0x24, 0x24, 0x38, 0x24, 0x24, 0x78, 0x00, 0x00, 0x00,
38 0x00, 0x00, 0x38, 0x44, 0x40, 0x40, 0x40, 0x44, 0x38, 0x00, 0x00, 0x00,
39 0x00, 0x00, 0x78, 0x24, 0x24, 0x24, 0x24, 0x24, 0x78, 0x00, 0x00, 0x00,
40 0x00, 0x00, 0x7C, 0x40, 0x40, 0x70, 0x40, 0x40, 0x7C, 0x00, 0x00, 0x00,
41 0x00, 0x00, 0x7C, 0x40, 0x40, 0x70, 0x40, 0x40, 0x40, 0x00, 0x00, 0x00,
42 0x00, 0x00, 0x38, 0x44, 0x40, 0x40, 0x4C, 0x44, 0x38, 0x00, 0x00, 0x00,
43 0x00, 0x00, 0x44, 0x44, 0x44, 0x7C, 0x44, 0x44, 0x44, 0x00, 0x00, 0x00,
44 0x00, 0x00, 0x38, 0x10, 0x10, 0x10, 0x10, 0x10, 0x38, 0x00, 0x00, 0x00,
45 0x00, 0x00, 0x04, 0x04, 0x04, 0x04, 0x04, 0x44, 0x38, 0x00, 0x00, 0x00,
46 0x00, 0x00, 0x44, 0x48, 0x50, 0x60, 0x50, 0x48, 0x44, 0x00, 0x00, 0x00,
47 0x00, 0x00, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x7C, 0x00, 0x00, 0x00,
48 0x00, 0x00, 0x44, 0x6C, 0x54, 0x54, 0x44, 0x44, 0x44, 0x00, 0x00, 0x00,
49 0x00, 0x00, 0x44, 0x44, 0x64, 0x54, 0x4C, 0x44, 0x44, 0x00, 0x00, 0x00,
50 0x00, 0x00, 0x38, 0x44, 0x44, 0x44, 0x44, 0x44, 0x38, 0x00, 0x00, 0x00,
51 0x00, 0x00, 0x78, 0x44, 0x44, 0x78, 0x40, 0x40, 0x40, 0x00, 0x00, 0x00,
52 0x00, 0x00, 0x38, 0x44, 0x44, 0x44, 0x54, 0x48, 0x34, 0x00, 0x00, 0x00,
53 0x00, 0x00, 0x78, 0x44, 0x44, 0x78, 0x50, 0x48, 0x44, 0x00, 0x00, 0x00,
54 0x00, 0x00, 0x38, 0x44, 0x40, 0x38, 0x04, 0x44, 0x38, 0x00, 0x00, 0x00,
55 0x00, 0x00, 0x7C, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x00, 0x00, 0x00,
56 0x00, 0x00, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x38, 0x00, 0x00, 0x00,
57 0x00, 0x00, 0x44, 0x44, 0x44, 0x28, 0x28, 0x10, 0x10, 0x00, 0x00, 0x00,
58 0x00, 0x00, 0x44, 0x44, 0x44, 0x44, 0x54, 0x6C, 0x44, 0x00, 0x00, 0x00,
59 0x00, 0x00, 0x44, 0x44, 0x28, 0x10, 0x28, 0x44, 0x44, 0x00, 0x00, 0x00,
60 0x00, 0x00, 0x44, 0x44, 0x28, 0x10, 0x10, 0x10, 0x10, 0x00, 0x00, 0x00,
61 0x00, 0x00, 0x7C, 0x04, 0x08, 0x10, 0x20, 0x40, 0x7C, 0x00, 0x00, 0x00,
62 0x00, 0x00, 0x38, 0x20, 0x20, 0x20, 0x20, 0x20, 0x38, 0x00, 0x00, 0x00,
63 0x00, 0x00, 0x00, 0x40, 0x20, 0x10, 0x08, 0x04, 0x00, 0x00, 0x00, 0x00,
64 0x00, 0x00, 0x38, 0x08, 0x08, 0x08, 0x08, 0x08, 0x38, 0x00, 0x00, 0x00,
65 0x00, 0x00, 0x10, 0x38, 0x54, 0x10, 0x10, 0x10, 0x10, 0x00, 0x00, 0x00,
66 0x00, 0x00, 0x00, 0x10, 0x20, 0x7C, 0x20, 0x10, 0x00, 0x00, 0x00, 0x00,
67 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
68 0x00, 0x00, 0x10, 0x10, 0x10, 0x10, 0x10, 0x00, 0x10, 0x00, 0x00, 0x00,
69 0x00, 0x00, 0x28, 0x28, 0x28, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
70 0x00, 0x00, 0x28, 0x28, 0x7C, 0x28, 0x7C, 0x28, 0x28, 0x00, 0x00, 0x00,
71 0x00, 0x00, 0x10, 0x3C, 0x50, 0x38, 0x14, 0x78, 0x10, 0x00, 0x00, 0x00,
72 0x00, 0x00, 0x60, 0x64, 0x08, 0x10, 0x20, 0x4C, 0x0C, 0x00, 0x00, 0x00,
73 0x00, 0x00, 0x20, 0x50, 0x50, 0x20, 0x54, 0x48, 0x34, 0x00, 0x00, 0x00,
74 0x00, 0x00, 0x10, 0x10, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
75 0x00, 0x00, 0x08, 0x10, 0x20, 0x20, 0x20, 0x10, 0x08, 0x00, 0x00, 0x00,
76 0x00, 0x00, 0x20, 0x10, 0x08, 0x08, 0x08, 0x10, 0x20, 0x00, 0x00, 0x00,
77 0x00, 0x00, 0x00, 0x10, 0x54, 0x38, 0x38, 0x54, 0x10, 0x00, 0x00, 0x00,
78 0x00, 0x00, 0x00, 0x10, 0x10, 0x7C, 0x10, 0x10, 0x00, 0x00, 0x00, 0x00,
79 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x20, 0x40, 0x00, 0x00,
80 0x00, 0x00, 0x00, 0x00, 0x00, 0x7C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
81 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00,
82 0x00, 0x00, 0x00, 0x04, 0x08, 0x10, 0x20, 0x40, 0x00, 0x00, 0x00, 0x00,
83 0x00, 0x00, 0x38, 0x44, 0x4C, 0x54, 0x64, 0x44, 0x38, 0x00, 0x00, 0x00,
84 0x00, 0x00, 0x10, 0x30, 0x10, 0x10, 0x10, 0x10, 0x38, 0x00, 0x00, 0x00,
85 0x00, 0x00, 0x38, 0x44, 0x04, 0x38, 0x40, 0x40, 0x7C, 0x00, 0x00, 0x00,
86 0x00, 0x00, 0x38, 0x44, 0x04, 0x08, 0x04, 0x44, 0x38, 0x00, 0x00, 0x00,
87 0x00, 0x00, 0x08, 0x18, 0x28, 0x48, 0x7C, 0x08, 0x08, 0x00, 0x00, 0x00,
88 0x00, 0x00, 0x7C, 0x40, 0x78, 0x04, 0x04, 0x44, 0x38, 0x00, 0x00, 0x00,
89 0x00, 0x00, 0x38, 0x40, 0x40, 0x78, 0x44, 0x44, 0x38, 0x00, 0x00, 0x00,
90 0x00, 0x00, 0x7C, 0x04, 0x08, 0x10, 0x20, 0x40, 0x40, 0x00, 0x00, 0x00,
91 0x00, 0x00, 0x38, 0x44, 0x44, 0x38, 0x44, 0x44, 0x38, 0x00, 0x00, 0x00,
92 0x00, 0x00, 0x38, 0x44, 0x44, 0x3C, 0x04, 0x04, 0x38, 0x00, 0x00, 0x00,
93 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00,
94 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x10, 0x10, 0x20, 0x00, 0x00,
95 0x00, 0x00, 0x08, 0x10, 0x20, 0x40, 0x20, 0x10, 0x08, 0x00, 0x00, 0x00,
96 0x00, 0x00, 0x00, 0x00, 0x7C, 0x00, 0x7C, 0x00, 0x00, 0x00, 0x00, 0x00,
97 0x00, 0x00, 0x20, 0x10, 0x08, 0x04, 0x08, 0x10, 0x20, 0x00, 0x00, 0x00,
98 0x00, 0x00, 0x38, 0x44, 0x04, 0x08, 0x10, 0x00, 0x10, 0x00, 0x00, 0x00
101 void MC6847::initialize()
103 MC6847_BASE::initialize();
105 // semigraphics pattern
106 for(int i = 0; i < 16; i++) {
107 for(int j = 0; j < 6; j++) {
108 sg4[i * 12 + j] = ((i & 0x08) ? 0xf0 : 0) | ((i & 0x04) ? 0x0f : 0);
110 for(int j = 6; j < 12; j++) {
111 sg4[i * 12 + j] = ((i & 0x02) ? 0xf0 : 0) | ((i & 0x01) ? 0x0f : 0);
114 for(int i = 0; i < 64; i++) {
115 for(int j = 0; j < 4; j++) {
116 sg6[i * 12 + j] = ((i & 0x20) ? 0xf0 : 0) | ((i & 0x10) ? 0x0f : 0);
118 for(int j = 4; j < 8; j++) {
119 sg6[i * 12 + j] = ((i & 0x08) ? 0xf0 : 0) | ((i & 0x04) ? 0x0f : 0);
121 for(int j = 8; j < 12; j++) {
122 sg6[i * 12 + j] = ((i & 0x02) ? 0xf0 : 0) | ((i & 0x01) ? 0x0f : 0);
126 palette_pc[LIGHTGREEN] = RGB_COLOR(184,255,181);
127 palette_pc[RED ] = RGB_COLOR(254, 65,105);
128 palette_pc[YELLOW ] = RGB_COLOR(252,253,153);
129 palette_pc[BLUE ] = RGB_COLOR(116, 41,255);
130 palette_pc[WHITE ] = RGB_COLOR(241,229,232);
131 palette_pc[CYAN ] = RGB_COLOR(124,210,213);
132 palette_pc[MAGENTA ] = RGB_COLOR(254,113,255);
133 palette_pc[ORANGE ] = RGB_COLOR(254,112, 35);
134 palette_pc[BLACK ] = RGB_COLOR( 0, 0, 0);
135 palette_pc[GREEN ] = RGB_COLOR( 22,134, 10);
136 palette_pc[BEIGE ] = RGB_COLOR(255,198,170);
137 palette_pc[GRAY ] = RGB_COLOR( 32, 32, 32);
142 register_vline_event(this);
143 update_timing(CPU_CLOCKS, FRAMES_PER_SEC, LINES_PER_FRAME);
146 void MC6847::draw_alpha()
151 for(int y = 0; y < 192; y += 12) {
152 for(int x = 0; x < 256; x += 8) {
153 uint8_t data = vram_ptr[ofs + MC6847_VRAM_OFS];
154 #ifdef MC6847_ATTR_OFS
155 uint8_t attr = vram_ptr[ofs + MC6847_ATTR_OFS];
157 if(++ofs >= vram_size) {
160 // vram data bits may be connected to mode signals
162 bool intext2 = intext;
165 #ifdef MC6847_VRAM_AS
166 as2 = ((data & MC6847_VRAM_AS) != 0);
168 #ifdef MC6847_VRAM_INTEXT
169 intext2 = ((data & MC6847_VRAM_INTEXT) != 0);
171 #ifdef MC6847_VRAM_CSS
172 css2 = ((data & MC6847_VRAM_CSS) != 0);
174 #ifdef MC6847_VRAM_INV
175 inv2 = ((data & MC6847_VRAM_INV) != 0);
177 #ifdef MC6847_ATTR_OFS
178 #ifdef MC6847_ATTR_AS
179 as2 = ((attr & MC6847_ATTR_AS) != 0);
181 #ifdef MC6847_ATTR_INTEXT
182 intext2 = ((attr & MC6847_ATTR_INTEXT) != 0);
184 #ifdef MC6847_ATTR_CSS
185 css2 = ((attr & MC6847_ATTR_CSS) != 0);
187 #ifdef MC6847_ATTR_INV
188 inv2 = ((attr & MC6847_ATTR_INV) != 0);
192 uint8_t col_fore, col_back;
195 // external alphanumerics
196 pattern = &extfont[16 * data];
198 // internal alphanumerics
199 pattern = (uint8_t *)(&intfont[12 * (data & 0x3f)]);
201 // note: we need to overwrite the color table by each driver
202 static const uint8_t color_table[6] = {
204 WHITE, GRAY, WHITE, GRAY, WHITE, GRAY
206 LIGHTGREEN, GREEN, BEIGE, RED, GREEN, BLACK
209 int col = (css2 ? 2 : 0) | (inv2 ? 1 : 0);
210 col_fore = color_table[col];
211 col_back = color_table[col ^ 1];
215 pattern = &sg6[12 * (data & 0x3f)];
216 col_fore = (css2 ? 4 : 0) | ((data >> 6) & 3);
219 pattern = &sg4[12 * (data & 0x0f)];
220 col_fore = (data >> 4) & 7;
224 for(int l = 0; l < 12; l++) {
225 uint8_t pat = pattern[l];
226 uint8_t* dest = &screen[y + l][x];
228 dest[0] = (pat & 0x80) ? col_fore : col_back;
229 dest[1] = (pat & 0x40) ? col_fore : col_back;
230 dest[2] = (pat & 0x20) ? col_fore : col_back;
231 dest[3] = (pat & 0x10) ? col_fore : col_back;
232 dest[4] = (pat & 0x08) ? col_fore : col_back;
233 dest[5] = (pat & 0x04) ? col_fore : col_back;
234 dest[6] = (pat & 0x02) ? col_fore : col_back;
235 dest[7] = (pat & 0x01) ? col_fore : col_back;