/*************************************************************************** Apple Hi-Resolution Video Card emulation RAMDAC: control at Fs0940e0, data at Fs0940e4 Fs090010 bit 16 is vbl status, bit 17 must be "1" for proper operation Fs08000x are the control registers ***************************************************************************/ #include "emu.h" #include "video/nubus_m2hires.h" #define M2HIRES_SCREEN_NAME "m2hires_screen" #define M2HIRES_ROM_REGION "m2hires_rom" #define VRAM_SIZE (0x80000) // 512k max static SCREEN_UPDATE_RGB32( m2hires ); MACHINE_CONFIG_FRAGMENT( m2hires ) MCFG_SCREEN_ADD( M2HIRES_SCREEN_NAME, RASTER) MCFG_SCREEN_UPDATE_STATIC(m2hires) MCFG_SCREEN_RAW_PARAMS(25175000, 800, 0, 640, 525, 0, 480) MCFG_SCREEN_SIZE(1024,768) MCFG_SCREEN_VISIBLE_AREA(0, 640-1, 0, 480-1) MACHINE_CONFIG_END ROM_START( m2hires ) ROM_REGION(0x2000, M2HIRES_ROM_REGION, 0) ROM_LOAD( "341-0660.bin", 0x0000, 0x2000, CRC(ea6f7913) SHA1(37c59f38ae34021d0cb86c2e76a598b7e6077c0d) ) ROM_END //************************************************************************** // GLOBAL VARIABLES //************************************************************************** const device_type NUBUS_M2HIRES = &device_creator; //------------------------------------------------- // machine_config_additions - device-specific // machine configurations //------------------------------------------------- machine_config_constructor nubus_m2hires_device::device_mconfig_additions() const { return MACHINE_CONFIG_NAME( m2hires ); } //------------------------------------------------- // rom_region - device-specific ROM region //------------------------------------------------- const rom_entry *nubus_m2hires_device::device_rom_region() const { return ROM_NAME( m2hires ); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // nubus_m2hires_device - constructor //------------------------------------------------- nubus_m2hires_device::nubus_m2hires_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : device_t(mconfig, NUBUS_M2HIRES, "Macintosh II Hi-Resolution video card", tag, owner, clock), device_nubus_card_interface(mconfig, *this) { m_shortname = "nb_m2hr"; } nubus_m2hires_device::nubus_m2hires_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock) : device_t(mconfig, type, name, tag, owner, clock), device_nubus_card_interface(mconfig, *this) { m_shortname = "nb_m2hr"; } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void nubus_m2hires_device::device_start() { UINT32 slotspace; // set_nubus_device makes m_slot valid set_nubus_device(); install_declaration_rom(this, M2HIRES_ROM_REGION, true); slotspace = get_slotspace(); // printf("[m2hires %p] slotspace = %x\n", this, slotspace); m_vram = auto_alloc_array(machine(), UINT8, VRAM_SIZE); m_vram32 = (UINT32 *)m_vram; m_nubus->install_device(slotspace, slotspace+VRAM_SIZE-1, read32_delegate(FUNC(nubus_m2hires_device::vram_r), this), write32_delegate(FUNC(nubus_m2hires_device::vram_w), this)); m_nubus->install_device(slotspace+0x900000, slotspace+VRAM_SIZE-1+0x900000, read32_delegate(FUNC(nubus_m2hires_device::vram_r), this), write32_delegate(FUNC(nubus_m2hires_device::vram_w), this)); m_nubus->install_device(slotspace+0x80000, slotspace+0xeffff, read32_delegate(FUNC(nubus_m2hires_device::m2hires_r), this), write32_delegate(FUNC(nubus_m2hires_device::m2hires_w), this)); m_timer = timer_alloc(0, NULL); m_screen = NULL; // can we look this up now? } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void nubus_m2hires_device::device_reset() { m_count = 0; m_clutoffs = 0; m_vbl_disable = 1; m_mode = 0; memset(m_vram, 0, VRAM_SIZE); memset(m_palette, 0, sizeof(m_palette)); m_palette[0] = MAKE_RGB(255, 255, 255); m_palette[0x80] = MAKE_RGB(0, 0, 0); } void nubus_m2hires_device::device_timer(emu_timer &timer, device_timer_id tid, int param, void *ptr) { if (!m_vbl_disable) { raise_slot_irq(); } m_timer->adjust(m_screen->time_until_pos(479, 0), 0); } /*************************************************************************** Spectrum 24 PDQ section ***************************************************************************/ static SCREEN_UPDATE_RGB32( m2hires ) { UINT32 *scanline; int x, y; nubus_m2hires_device *card = downcast(screen.owner()); UINT8 pixels, *vram; // first time? kick off the VBL timer if (!card->m_screen) { card->m_screen = &screen; card->m_timer->adjust(card->m_screen->time_until_pos(479, 0), 0); } vram = card->m_vram + 0x20; switch (card->m_mode) { case 0: // 1 bpp? for (y = 0; y < 480; y++) { scanline = &bitmap.pix32(y); for (x = 0; x < 640/8; x++) { pixels = vram[(y * 128) + (BYTE4_XOR_BE(x))]; *scanline++ = card->m_palette[((pixels>>7)&0x1)]; *scanline++ = card->m_palette[((pixels>>6)&0x1)]; *scanline++ = card->m_palette[((pixels>>5)&0x1)]; *scanline++ = card->m_palette[((pixels>>4)&0x1)]; *scanline++ = card->m_palette[((pixels>>3)&0x1)]; *scanline++ = card->m_palette[((pixels>>2)&0x1)]; *scanline++ = card->m_palette[((pixels>>1)&0x1)]; *scanline++ = card->m_palette[(pixels&1)]; } } break; case 1: // 2 bpp for (y = 0; y < 480; y++) { scanline = &bitmap.pix32(y); for (x = 0; x < 640/4; x++) { pixels = vram[(y * 256) + (BYTE4_XOR_BE(x))]; *scanline++ = card->m_palette[((pixels>>6)&3)]; *scanline++ = card->m_palette[((pixels>>4)&3)]; *scanline++ = card->m_palette[((pixels>>2)&3)]; *scanline++ = card->m_palette[(pixels&3)]; } } break; case 2: // 4 bpp for (y = 0; y < 480; y++) { scanline = &bitmap.pix32(y); for (x = 0; x < 640/2; x++) { pixels = vram[(y * 512) + (BYTE4_XOR_BE(x))]; *scanline++ = card->m_palette[((pixels&0xf0)>>4)]; *scanline++ = card->m_palette[(pixels&0xf)]; } } break; case 3: // 8 bpp for (y = 0; y < 480; y++) { scanline = &bitmap.pix32(y); for (x = 0; x < 640; x++) { pixels = vram[(y * 1024) + (BYTE4_XOR_BE(x))]; *scanline++ = card->m_palette[pixels]; } } break; default: fatalerror("m2hires: unknown video mode %d", card->m_mode); break; } return 0; } WRITE32_MEMBER( nubus_m2hires_device::m2hires_w ) { data ^= 0xffffffff; switch (offset) { case 1: // mode switch (data) { case 0x20000000: m_mode = 0; break; case 0x40000000: m_mode = 1; break; case 0x80000000: m_mode = 2; break; case 0x00010000: m_mode = 3; break; } break; case 0x5038: // DAC control // printf("%08x to DAC control (PC=%x)\n", data, cpu_get_pc(&space.device())); m_clutoffs = (data>>24)&0xff; break; case 0x5039: // DAC data m_colors[m_count++] = (data>>24) & 0xff; if (m_count == 3) { // printf("RAMDAC: color %d = %02x %02x %02x (PC=%x)\n", m_clutoffs, m_colors[0], m_colors[1], m_colors[2], cpu_get_pc(&space.device()) ); m_palette[m_clutoffs] = MAKE_RGB(m_colors[0], m_colors[1], m_colors[2]); m_clutoffs++; if (m_clutoffs > 255) { m_clutoffs = 0; } m_count = 0; } break; case 0x8000: // enable and ack VBL m_vbl_disable = 0; lower_slot_irq(); break; case 0x8001: // disable VBL m_vbl_disable = 1; break; default: // printf("m2hires_w: %08x @ %x, mask %08x (PC=%x)\n", data, offset, mem_mask, cpu_get_pc(&space.device())); break; } } READ32_MEMBER( nubus_m2hires_device::m2hires_r ) { if (offset == 0x10010/4) { m_toggle ^= (1<<16); return m_toggle | (1<<17); // bit 17 indicates a 4/8bpp capable ASIC apparently; the firmware won't enter those modes otherwise (although they show in the list) } /* else { printf("m2hires_r: @ %x, mask %08x (PC=%x)\n", offset, mem_mask, cpu_get_pc(&space.device())); }*/ return 0; } WRITE32_MEMBER( nubus_m2hires_device::vram_w ) { data ^= 0xffffffff; COMBINE_DATA(&m_vram32[offset]); } READ32_MEMBER( nubus_m2hires_device::vram_r ) { return m_vram32[offset] ^ 0xffffffff; }