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view src/vid_ati18800.c @ 131:f22b6152c221

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Fixed memory mapping on ISA video cards - should now work on Award 430VX PCI.
author TomW
date Wed Jul 16 20:00:34 2014 +0100
parents 036dc3a418ac
children 24b744b9a632
line source
1 /*ATI 18800 emulation (VGA Edge-16)*/
2 #include <stdlib.h>
3 #include "ibm.h"
4 #include "device.h"
5 #include "io.h"
6 #include "mem.h"
7 #include "rom.h"
8 #include "video.h"
9 #include "vid_ati18800.h"
10 #include "vid_ati_eeprom.h"
11 #include "vid_svga.h"
12
13 typedef struct ati18800_t
14 {
15 svga_t svga;
16 ati_eeprom_t eeprom;
17
18 rom_t bios_rom;
19
20 uint8_t regs[256];
21 int index;
22 } ati18800_t;
23
24 void ati18800_out(uint16_t addr, uint8_t val, void *p)
25 {
26 ati18800_t *ati18800 = (ati18800_t *)p;
27 svga_t *svga = &ati18800->svga;
28 uint8_t old;
29
30 // pclog("ati18800_out : %04X %02X %04X:%04X\n", addr, val, CS,pc);
31
32 if (((addr&0xFFF0) == 0x3D0 || (addr&0xFFF0) == 0x3B0) && !(svga->miscout&1)) addr ^= 0x60;
33
34 switch (addr)
35 {
36 case 0x1ce:
37 ati18800->index = val;
38 break;
39 case 0x1cf:
40 ati18800->regs[ati18800->index] = val;
41 switch (ati18800->index)
42 {
43 case 0xb2:
44 case 0xbe:
45 if (ati18800->regs[0xbe] & 8) /*Read/write bank mode*/
46 {
47 svga->read_bank = ((ati18800->regs[0xb2] >> 5) & 7) * 0x10000;
48 svga->write_bank = ((ati18800->regs[0xb2] >> 1) & 7) * 0x10000;
49 }
50 else /*Single bank mode*/
51 svga->read_bank = svga->write_bank = ((ati18800->regs[0xb2] >> 1) & 7) * 0x10000;
52 break;
53 case 0xb3:
54 ati_eeprom_write(&ati18800->eeprom, val & 8, val & 2, val & 1);
55 break;
56 }
57 break;
58
59 case 0x3D4:
60 svga->crtcreg = val & 0x3f;
61 return;
62 case 0x3D5:
63 if (svga->crtcreg <= 7 && svga->crtc[0x11] & 0x80) return;
64 old = svga->crtc[svga->crtcreg];
65 svga->crtc[svga->crtcreg] = val;
66 if (old != val)
67 {
68 if (svga->crtcreg < 0xe || svga->crtcreg > 0x10)
69 {
70 svga->fullchange = changeframecount;
71 svga_recalctimings(svga);
72 }
73 }
74 break;
75 }
76 svga_out(addr, val, svga);
77 }
78
79 uint8_t ati18800_in(uint16_t addr, void *p)
80 {
81 ati18800_t *ati18800 = (ati18800_t *)p;
82 svga_t *svga = &ati18800->svga;
83 uint8_t temp;
84
85 // if (addr != 0x3da) pclog("ati18800_in : %04X ", addr);
86
87 if (((addr&0xFFF0) == 0x3D0 || (addr&0xFFF0) == 0x3B0) && !(svga->miscout&1)) addr ^= 0x60;
88
89 switch (addr)
90 {
91 case 0x1ce:
92 temp = ati18800->index;
93 break;
94 case 0x1cf:
95 switch (ati18800->index)
96 {
97 case 0xb7:
98 temp = ati18800->regs[ati18800->index] & ~8;
99 if (ati_eeprom_read(&ati18800->eeprom))
100 temp |= 8;
101 break;
102
103 default:
104 temp = ati18800->regs[ati18800->index];
105 break;
106 }
107 break;
108
109 case 0x3D4:
110 temp = svga->crtcreg;
111 break;
112 case 0x3D5:
113 temp = svga->crtc[svga->crtcreg];
114 break;
115 default:
116 temp = svga_in(addr, svga);
117 break;
118 }
119 if (addr != 0x3da) pclog("%02X %04X:%04X\n", temp, CS,pc);
120 return temp;
121 }
122
123 void *ati18800_init()
124 {
125 ati18800_t *ati18800 = malloc(sizeof(ati18800_t));
126 memset(ati18800, 0, sizeof(ati18800_t));
127
128 rom_init(&ati18800->bios_rom, "roms/vgaedge16.vbi", 0xc0000, 0x8000, 0x7fff, 0, MEM_MAPPING_EXTERNAL);
129
130 svga_init(&ati18800->svga, ati18800, 1 << 19, /*512kb*/
131 NULL,
132 ati18800_in, ati18800_out,
133 NULL,
134 NULL);
135
136 io_sethandler(0x01ce, 0x0002, ati18800_in, NULL, NULL, ati18800_out, NULL, NULL, ati18800);
137 io_sethandler(0x03c0, 0x0020, ati18800_in, NULL, NULL, ati18800_out, NULL, NULL, ati18800);
138
139 ati18800->svga.miscout = 1;
140
141 ati_eeprom_load(&ati18800->eeprom, "ati18800.nvr", 0);
142
143 return ati18800;
144 }
145
146 static int ati18800_available()
147 {
148 return rom_present("roms/vgaedge16.vbi");
149 }
150
151 void ati18800_close(void *p)
152 {
153 ati18800_t *ati18800 = (ati18800_t *)p;
154
155 svga_close(&ati18800->svga);
156
157 free(ati18800);
158 }
159
160 void ati18800_speed_changed(void *p)
161 {
162 ati18800_t *ati18800 = (ati18800_t *)p;
163
164 svga_recalctimings(&ati18800->svga);
165 }
166
167 void ati18800_force_redraw(void *p)
168 {
169 ati18800_t *ati18800 = (ati18800_t *)p;
170
171 ati18800->svga.fullchange = changeframecount;
172 }
173
174 int ati18800_add_status_info(char *s, int max_len, void *p)
175 {
176 ati18800_t *ati18800 = (ati18800_t *)p;
177
178 return svga_add_status_info(s, max_len, &ati18800->svga);
179 }
180
181 device_t ati18800_device =
182 {
183 "ATI-18800",
184 0,
185 ati18800_init,
186 ati18800_close,
187 ati18800_available,
188 ati18800_speed_changed,
189 ati18800_force_redraw,
190 ati18800_add_status_info
191 };
192