280 lines
8.0 KiB
C
280 lines
8.0 KiB
C
/*ATI 28800 emulation (VGA Charger)*/
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#include <stdlib.h>
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#include "ibm.h"
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#include "device.h"
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#include "io.h"
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#include "mem.h"
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#include "rom.h"
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#include "video.h"
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#include "vid_ati28800.h"
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#include "vid_ati_eeprom.h"
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#include "vid_svga.h"
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#include "vid_svga_render.h"
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typedef struct ati28800_t
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{
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svga_t svga;
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ati_eeprom_t eeprom;
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rom_t bios_rom;
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uint8_t regs[256];
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int index;
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} ati28800_t;
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void ati28800_out(uint16_t addr, uint8_t val, void *p)
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{
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ati28800_t *ati28800 = (ati28800_t *)p;
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svga_t *svga = &ati28800->svga;
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uint8_t old;
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// pclog("ati28800_out : %04X %02X %04X:%04X\n", addr, val, CS,cpu_state.pc);
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if (((addr&0xFFF0) == 0x3D0 || (addr&0xFFF0) == 0x3B0) && !(svga->miscout&1))
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addr ^= 0x60;
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switch (addr)
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{
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case 0x1ce:
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ati28800->index = val;
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break;
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case 0x1cf:
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ati28800->regs[ati28800->index] = val;
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switch (ati28800->index)
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{
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case 0xb2:
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case 0xbe:
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if (ati28800->regs[0xbe] & 8) /*Read/write bank mode*/
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{
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svga->read_bank = ((ati28800->regs[0xb2] >> 5) & 7) * 0x10000;
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svga->write_bank = ((ati28800->regs[0xb2] >> 1) & 7) * 0x10000;
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}
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else /*Single bank mode*/
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svga->read_bank = svga->write_bank = ((ati28800->regs[0xb2] >> 1) & 7) * 0x10000;
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break;
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case 0xb3:
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ati_eeprom_write(&ati28800->eeprom, val & 8, val & 2, val & 1);
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break;
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}
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break;
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case 0x3D4:
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svga->crtcreg = val & 0x3f;
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return;
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case 0x3D5:
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if (svga->crtcreg <= 0x18)
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val &= mask_crtc[svga->crtcreg];
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if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80))
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return;
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if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80))
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val = (svga->crtc[7] & ~0x10) | (val & 0x10);
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old = svga->crtc[svga->crtcreg];
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svga->crtc[svga->crtcreg] = val;
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if (old != val)
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{
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if (svga->crtcreg < 0xe || svga->crtcreg > 0x10)
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{
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svga->fullchange = changeframecount;
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svga_recalctimings(svga);
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}
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}
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break;
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}
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svga_out(addr, val, svga);
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}
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uint8_t ati28800_in(uint16_t addr, void *p)
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{
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ati28800_t *ati28800 = (ati28800_t *)p;
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svga_t *svga = &ati28800->svga;
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uint8_t temp;
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// if (addr != 0x3da) pclog("ati28800_in : %04X ", addr);
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if (((addr&0xFFF0) == 0x3D0 || (addr&0xFFF0) == 0x3B0) && !(svga->miscout&1)) addr ^= 0x60;
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switch (addr)
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{
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case 0x1ce:
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temp = ati28800->index;
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break;
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case 0x1cf:
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switch (ati28800->index)
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{
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case 0xb7:
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temp = ati28800->regs[ati28800->index] & ~8;
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if (ati_eeprom_read(&ati28800->eeprom))
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temp |= 8;
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break;
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default:
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temp = ati28800->regs[ati28800->index];
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break;
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}
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break;
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case 0x3c2:
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if ((svga->vgapal[0].r + svga->vgapal[0].g + svga->vgapal[0].b) >= 0x50)
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temp = 0;
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else
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temp = 0x10;
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break;
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case 0x3D4:
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temp = svga->crtcreg;
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break;
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case 0x3D5:
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temp = svga->crtc[svga->crtcreg];
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break;
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default:
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temp = svga_in(addr, svga);
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break;
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}
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#ifndef RELEASE_BUILD
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if (addr != 0x3da) pclog("%02X %04X:%04X\n", temp, CS,cpu_state.pc);
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#endif
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return temp;
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}
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void ati28800_recalctimings(svga_t *svga)
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{
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ati28800_t *ati28800 = (ati28800_t *)svga->p;
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#ifndef RELEASE_BUILD
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pclog("ati28800_recalctimings\n");
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#endif
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if (!svga->scrblank && (ati28800->regs[0xb0] & 0x20)) /*Extended 256 colour modes*/
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{
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#ifndef RELEASE_BUILD
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pclog("8bpp_highres\n");
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#endif
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svga->render = svga_render_8bpp_highres;
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svga->rowoffset <<= 1;
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svga->ma <<= 1;
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}
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}
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void *ati28800_init()
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{
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uint32_t memory = 512;
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if (gfxcard == GFX_VGAWONDERXL) device_get_config_int("memory");
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memory <<= 10;
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ati28800_t *ati28800 = malloc(sizeof(ati28800_t));
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memset(ati28800, 0, sizeof(ati28800_t));
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if (gfxcard == GFX_VGAWONDERXL)
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{
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rom_init_interleaved(&ati28800->bios_rom,
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"roms/XLEVEN.BIN",
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"roms/XLODD.BIN",
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0xc0000, 0x10000, 0xffff, 0, MEM_MAPPING_EXTERNAL);
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}
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else
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rom_init(&ati28800->bios_rom, "roms/bios.bin", 0xc0000, 0x8000, 0x7fff, 0, MEM_MAPPING_EXTERNAL);
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svga_init(&ati28800->svga, ati28800, memory, /*512kb*/
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ati28800_recalctimings,
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ati28800_in, ati28800_out,
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NULL,
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NULL);
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io_sethandler(0x01ce, 0x0002, ati28800_in, NULL, NULL, ati28800_out, NULL, NULL, ati28800);
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io_sethandler(0x03c0, 0x0020, ati28800_in, NULL, NULL, ati28800_out, NULL, NULL, ati28800);
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ati28800->svga.miscout = 1;
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ati_eeprom_load(&ati28800->eeprom, "ati28800.nvr", 0);
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return ati28800;
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}
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static int ati28800_available()
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{
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return rom_present("roms/bios.bin");
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}
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static int compaq_ati28800_available()
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{
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return (rom_present("roms/XLEVEN.bin") && rom_present("roms/XLODD.bin"));
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}
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void ati28800_close(void *p)
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{
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ati28800_t *ati28800 = (ati28800_t *)p;
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svga_close(&ati28800->svga);
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free(ati28800);
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}
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void ati28800_speed_changed(void *p)
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{
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ati28800_t *ati28800 = (ati28800_t *)p;
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svga_recalctimings(&ati28800->svga);
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}
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void ati28800_force_redraw(void *p)
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{
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ati28800_t *ati28800 = (ati28800_t *)p;
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ati28800->svga.fullchange = changeframecount;
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}
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void ati28800_add_status_info(char *s, int max_len, void *p)
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{
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ati28800_t *ati28800 = (ati28800_t *)p;
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svga_add_status_info(s, max_len, &ati28800->svga);
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}
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static device_config_t compaq_ati28800_config[] =
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{
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{
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.name = "memory",
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.description = "Memory size",
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.type = CONFIG_SELECTION,
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.selection =
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{
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{
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.description = "512 kB",
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.value = 512
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},
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{
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.description = "1 MB",
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.value = 1024
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},
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{
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.description = ""
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}
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},
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.default_int = 512
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},
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{
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.type = -1
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}
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};
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device_t ati28800_device =
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{
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"ATI-28800",
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0,
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ati28800_init,
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ati28800_close,
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ati28800_available,
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ati28800_speed_changed,
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ati28800_force_redraw,
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ati28800_add_status_info
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};
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device_t compaq_ati28800_device =
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{
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"Compaq ATI-28800",
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0,
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ati28800_init,
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ati28800_close,
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compaq_ati28800_available,
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ati28800_speed_changed,
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ati28800_force_redraw,
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ati28800_add_status_info,
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compaq_ati28800_config
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};
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