// license:BSD-3-Clause // copyright-holders:R. Belmont /*************************************************************************** Apple Macintosh II Video Card (630-0153) emulation Video ASIC is "TFB" 344-0001 RAMDAC is Bt453: control at Fs09001C, data at Fs090018 Fs08000x is general framebuffer control (video mode at 0) Fs0D0000 bit 0 is VBL status ***************************************************************************/ #include "emu.h" #include "nubus_m2video.h" #include "screen.h" #define M2VIDEO_SCREEN_NAME "m2video_screen" #define M2VIDEO_ROM_REGION "m2video_rom" #define VRAM_SIZE (0x80000) // 512k max ROM_START( m2video ) ROM_REGION(0x1000, M2VIDEO_ROM_REGION, 0) ROM_LOAD( "342-0008-a.bin", 0x000000, 0x001000, CRC(bf50850d) SHA1(abe85d8a882bb2b8187a28bd6707fc2f5d77eedd) ) ROM_END //************************************************************************** // GLOBAL VARIABLES //************************************************************************** DEFINE_DEVICE_TYPE(NUBUS_M2VIDEO, nubus_m2video_device, "nb_m2vc", "Macintosh II Video Card") //------------------------------------------------- // device_add_mconfig - add device configuration //------------------------------------------------- MACHINE_CONFIG_START(nubus_m2video_device::device_add_mconfig) MCFG_SCREEN_ADD(M2VIDEO_SCREEN_NAME, RASTER) MCFG_SCREEN_UPDATE_DEVICE(DEVICE_SELF, nubus_m2video_device, screen_update) 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_region - device-specific ROM region //------------------------------------------------- const tiny_rom_entry *nubus_m2video_device::device_rom_region() const { return ROM_NAME( m2video ); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // nubus_m2video_device - constructor //------------------------------------------------- nubus_m2video_device::nubus_m2video_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : nubus_m2video_device(mconfig, NUBUS_M2VIDEO, tag, owner, clock) { } nubus_m2video_device::nubus_m2video_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, type, tag, owner, clock), device_video_interface(mconfig, *this), device_nubus_card_interface(mconfig, *this), m_vram32(nullptr), m_mode(0), m_vbl_disable(0), m_toggle(0), m_count(0), m_clutoffs(0), m_timer(nullptr) { set_screen(*this, M2VIDEO_SCREEN_NAME); } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void nubus_m2video_device::device_start() { uint32_t slotspace; install_declaration_rom(this, M2VIDEO_ROM_REGION, true, true); slotspace = get_slotspace(); // logerror("[m2video %p] slotspace = %x\n", this, slotspace); m_vram.resize(VRAM_SIZE); m_vram32 = (uint32_t *)&m_vram[0]; nubus().install_device(slotspace, slotspace+VRAM_SIZE-1, read32_delegate(FUNC(nubus_m2video_device::vram_r), this), write32_delegate(FUNC(nubus_m2video_device::vram_w), this)); nubus().install_device(slotspace+0x900000, slotspace+VRAM_SIZE-1+0x900000, read32_delegate(FUNC(nubus_m2video_device::vram_r), this), write32_delegate(FUNC(nubus_m2video_device::vram_w), this)); nubus().install_device(slotspace+0x80000, slotspace+0xeffff, read32_delegate(FUNC(nubus_m2video_device::m2video_r), this), write32_delegate(FUNC(nubus_m2video_device::m2video_w), this)); m_timer = timer_alloc(0, nullptr); m_timer->adjust(screen().time_until_pos(479, 0), 0); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void nubus_m2video_device::device_reset() { m_count = 0; m_clutoffs = 0; m_vbl_disable = 1; m_mode = 0; memset(&m_vram[0], 0, VRAM_SIZE); memset(m_palette, 0, sizeof(m_palette)); m_palette[0] = rgb_t(255, 255, 255); m_palette[0x80] = rgb_t(0, 0, 0); } void nubus_m2video_device::device_timer(emu_timer &timer, device_timer_id tid, int param, void *ptr) { if (!m_vbl_disable) { raise_slot_irq(); } m_timer->adjust(screen().time_until_pos(479, 0), 0); } /*************************************************************************** "TFB" section ***************************************************************************/ uint32_t nubus_m2video_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect) { uint32_t *scanline; int x, y; uint8_t pixels, *vram; vram = &m_vram[0x20]; switch (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++ = m_palette[(pixels&0x80)]; *scanline++ = m_palette[((pixels<<1)&0x80)]; *scanline++ = m_palette[((pixels<<2)&0x80)]; *scanline++ = m_palette[((pixels<<3)&0x80)]; *scanline++ = m_palette[((pixels<<4)&0x80)]; *scanline++ = m_palette[((pixels<<5)&0x80)]; *scanline++ = m_palette[((pixels<<6)&0x80)]; *scanline++ = m_palette[((pixels<<7)&0x80)]; } } 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++ = m_palette[(pixels&0xc0)]; *scanline++ = m_palette[((pixels<<2)&0xc0)]; *scanline++ = m_palette[((pixels<<4)&0xc0)]; *scanline++ = m_palette[((pixels<<6)&0xc0)]; } } 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++ = m_palette[(pixels&0xf0)]; *scanline++ = m_palette[((pixels&0x0f)<<4)]; } } 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++ = m_palette[pixels]; } } break; default: fatalerror("m2video: unknown video mode %d\n", m_mode); } return 0; } WRITE32_MEMBER( nubus_m2video_device::m2video_w ) { data ^= 0xffffffff; switch (offset) { case 0: // mode switch (data & 0xff000000) { case 0x20000000: m_mode = 0; break; case 0x40000000: m_mode = 1; break; case 0x80000000: m_mode = 2; break; case 0x00000000: m_mode = 3; break; } break; case 0x4007: // DAC control // logerror("%08x to DAC control %s\n", data, machine().describe_context()); m_clutoffs = (data>>24)&0xff; break; case 0x4006: // DAC data m_colors[m_count++] = (data>>24) & 0xff; if (m_count == 3) { // logerror("RAMDAC: color %02x = %02x %02x %02x %s\n", m_clutoffs, m_colors[0], m_colors[1], m_colors[2], machine().describe_context() ); m_palette[m_clutoffs] = rgb_t(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: // logerror("m2video_w: %08x @ %x, mask %08x %s\n", data, offset, mem_mask, machine().describe_context()); break; } } READ32_MEMBER( nubus_m2video_device::m2video_r ) { if (offset == 0x50000/4) // bit 0 is VBL status { m_toggle ^= 1; return m_toggle; } else { // logerror("m2video_r: @ %x, mask %08x %s\n", offset, mem_mask, machine().describe_context()); } return 0; } WRITE32_MEMBER( nubus_m2video_device::vram_w ) { data ^= 0xffffffff; COMBINE_DATA(&m_vram32[offset]); } READ32_MEMBER( nubus_m2video_device::vram_r ) { return m_vram32[offset] ^ 0xffffffff; }