diff options
Diffstat (limited to 'src/devices/bus/nubus/nubus_48gc.c')
-rw-r--r-- | src/devices/bus/nubus/nubus_48gc.c | 369 |
1 files changed, 369 insertions, 0 deletions
diff --git a/src/devices/bus/nubus/nubus_48gc.c b/src/devices/bus/nubus/nubus_48gc.c new file mode 100644 index 00000000000..213cf0a0753 --- /dev/null +++ b/src/devices/bus/nubus/nubus_48gc.c @@ -0,0 +1,369 @@ +// license:BSD-3-Clause +// copyright-holders:R. Belmont +/*************************************************************************** + + Apple 4*8 Graphics Card (model 630-0400) emulation + Apple 8*24 Graphics Card emulation (cards have the same framebuffer chip + w/different ROMs and RAMDACs, apparently) + +***************************************************************************/ + +#include "emu.h" +#include "nubus_48gc.h" + +#define VRAM_SIZE (0x200000) // 2 megs, maxed out + +#define GC48_SCREEN_NAME "48gc_screen" +#define GC48_ROM_REGION "48gc_rom" + +MACHINE_CONFIG_FRAGMENT( macvideo_48gc ) + MCFG_SCREEN_ADD( GC48_SCREEN_NAME, RASTER) + MCFG_SCREEN_UPDATE_DEVICE(DEVICE_SELF, jmfb_device, screen_update) + MCFG_SCREEN_RAW_PARAMS(25175000, 800, 0, 640, 525, 0, 480) +// MCFG_SCREEN_SIZE(1152, 870) +// MCFG_SCREEN_VISIBLE_AREA(0, 1152-1, 0, 870-1) +// MCFG_SCREEN_REFRESH_RATE(75) +// MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(1260)) +MACHINE_CONFIG_END + +ROM_START( gc48 ) + ROM_REGION(0x8000, GC48_ROM_REGION, 0) + ROM_LOAD( "3410801.bin", 0x0000, 0x8000, CRC(e283da91) SHA1(4ae21d6d7bbaa6fc7aa301bee2b791ed33b1dcf9) ) +ROM_END + +ROM_START( gc824 ) + ROM_REGION(0x8000, GC48_ROM_REGION, 0) + ROM_LOAD( "3410868.bin", 0x000000, 0x008000, CRC(57f925fa) SHA1(4d3c0632711b7b31c8e0c5cfdd7ec1904f178336) ) +ROM_END + +//************************************************************************** +// GLOBAL VARIABLES +//************************************************************************** + +const device_type NUBUS_48GC = &device_creator<nubus_48gc_device>; +const device_type NUBUS_824GC = &device_creator<nubus_824gc_device>; + + +//------------------------------------------------- +// machine_config_additions - device-specific +// machine configurations +//------------------------------------------------- + +machine_config_constructor jmfb_device::device_mconfig_additions() const +{ + return MACHINE_CONFIG_NAME( macvideo_48gc ); +} + +//------------------------------------------------- +// rom_region - device-specific ROM region +//------------------------------------------------- + +const rom_entry *jmfb_device::device_rom_region() const +{ + return ROM_NAME( gc48 ); +} + +const rom_entry *nubus_824gc_device::device_rom_region() const +{ + return ROM_NAME( gc824 ); +} + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// jmfb_device - constructor +//------------------------------------------------- + +jmfb_device::jmfb_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source) : + device_t(mconfig, type, name, tag, owner, clock, shortname, source), + device_video_interface(mconfig, *this), + device_nubus_card_interface(mconfig, *this) +{ + m_assembled_tag = std::string(tag).append(":").append(GC48_SCREEN_NAME); + m_screen_tag = m_assembled_tag.c_str(); +} + +nubus_48gc_device::nubus_48gc_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + jmfb_device(mconfig, NUBUS_48GC, "Apple 4*8 video card", tag, owner, clock, "nb_48gc", __FILE__) +{ + m_is824 = false; +} + +nubus_824gc_device::nubus_824gc_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + jmfb_device(mconfig, NUBUS_824GC, "Apple 8*24 video card", tag, owner, clock, "nb_824gc", __FILE__) +{ + m_is824 = true; +} + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void jmfb_device::device_start() +{ + UINT32 slotspace; + + // set_nubus_device makes m_slot valid + set_nubus_device(); + install_declaration_rom(this, GC48_ROM_REGION); + + slotspace = get_slotspace(); + +// printf("[JMFB %p] slotspace = %x\n", this, slotspace); + + m_vram.resize(VRAM_SIZE); + install_bank(slotspace, slotspace+VRAM_SIZE-1, 0, 0, "bank_48gc", &m_vram[0]); + + m_nubus->install_device(slotspace+0x200000, slotspace+0x2003ff, read32_delegate(FUNC(jmfb_device::mac_48gc_r), this), write32_delegate(FUNC(jmfb_device::mac_48gc_w), this)); + + m_timer = timer_alloc(0, NULL); + m_screen = NULL; // can we look this up now? +} + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + +void jmfb_device::device_reset() +{ + m_toggle = 0; + m_clutoffs = 0; + m_count = 0; + m_vbl_disable = 1; + m_stride = 80; + m_base = 0; + m_xres = 640; + m_yres = 480; + m_mode = 0; + memset(&m_vram[0], 0, VRAM_SIZE); + memset(m_palette, 0, sizeof(m_palette)); +} + +/*************************************************************************** + + Apple 4*8 Graphics Card section + +***************************************************************************/ + +void jmfb_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); +} + +UINT32 jmfb_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect) +{ + UINT32 *scanline, *base; + int x, y; + UINT8 *vram8 = &m_vram[0]; + UINT8 pixels; + + // first time? kick off the VBL timer + if (!m_screen) + { + m_screen = &screen; + m_timer->adjust(m_screen->time_until_pos(479, 0), 0); + } + + vram8 += 0xa00; + + switch (m_mode) + { + case 0: // 1bpp + for (y = 0; y < m_yres; y++) + { + scanline = &bitmap.pix32(y); + for (x = 0; x < m_xres/8; x++) + { + pixels = vram8[(y * m_stride) + (BYTE4_XOR_BE(x))]; + + *scanline++ = m_palette[(pixels>>7)&1]; + *scanline++ = m_palette[(pixels>>6)&1]; + *scanline++ = m_palette[(pixels>>5)&1]; + *scanline++ = m_palette[(pixels>>4)&1]; + *scanline++ = m_palette[(pixels>>3)&1]; + *scanline++ = m_palette[(pixels>>2)&1]; + *scanline++ = m_palette[(pixels>>1)&1]; + *scanline++ = m_palette[pixels&1]; + } + } + break; + + case 1: // 2bpp + for (y = 0; y < m_yres; y++) + { + scanline = &bitmap.pix32(y); + for (x = 0; x < m_xres/4; x++) + { + pixels = vram8[(y * m_stride) + (BYTE4_XOR_BE(x))]; + + *scanline++ = m_palette[(pixels>>6)&0x3]; + *scanline++ = m_palette[(pixels>>4)&0x3]; + *scanline++ = m_palette[(pixels>>2)&0x3]; + *scanline++ = m_palette[pixels&3]; + } + } + break; + + case 2: // 4 bpp + for (y = 0; y < m_yres; y++) + { + scanline = &bitmap.pix32(y); + + for (x = 0; x < m_xres/2; x++) + { + pixels = vram8[(y * m_stride) + (BYTE4_XOR_BE(x))]; + + *scanline++ = m_palette[(pixels>>4)&0xf]; + *scanline++ = m_palette[pixels&0xf]; + } + } + break; + + case 3: // 8 bpp + for (y = 0; y < m_yres; y++) + { + scanline = &bitmap.pix32(y); + + for (x = 0; x < m_xres; x++) + { + pixels = vram8[(y * m_stride) + (BYTE4_XOR_BE(x))]; + *scanline++ = m_palette[pixels]; + } + } + break; + + case 4: // 24 bpp + for (y = 0; y < m_yres; y++) + { + scanline = &bitmap.pix32(y); + base = (UINT32 *)&m_vram[y * m_stride]; + for (x = 0; x < m_xres; x++) + { + *scanline++ = *base++; + } + } + break; + } + + return 0; +} + +WRITE32_MEMBER( jmfb_device::mac_48gc_w ) +{ + COMBINE_DATA(&m_registers[offset&0xff]); + + switch (offset) + { + case 0x8/4: // base +// printf("%x to base\n", data); + m_base = (data*2)<<4; + break; + + case 0xc/4: // stride +// printf("%x to stride\n", data); + // this value is in DWORDs for 1-8 bpp and, uhh, strange for 24bpp + if (m_mode < 4) + { + m_stride = data*4; + } + else + { + m_stride = (data*32)/3; + } + break; + + case 0x200/4: // DAC control +// printf("%08x to DAC control\n", data); + if (m_is824) + { + m_clutoffs = data&0xff; + } + else + { + m_clutoffs = data>>24; + } + m_count = 0; + break; + + case 0x204/4: // DAC data + if (m_is824) + { + m_colors[m_count++] = data&0xff; + } + else + { + m_colors[m_count++] = data>>24; + } + + if (m_count == 3) + { +// printf("RAMDAC: color %d = %02x %02x %02x\n", m_clutoffs, m_colors[0], m_colors[1], m_colors[2]); + m_palette[m_clutoffs] = rgb_t(m_colors[0], m_colors[1], m_colors[2]); + m_clutoffs++; + m_count = 0; + } + break; + + case 0x208/4: // mode control + m_mode = (data>>3)&3; + if (m_mode == 3) // this can be 8 or 24 bpp + { + // check pixel format for 24bpp + if (m_is824) + { + if (data & 2) + { + m_mode = 4; // 24bpp + } + } + else + { + if (((data>>5)&3) == 0) + { + m_mode = 4; // 24bpp + } + } + } +// printf("%02x to mode (m_mode = %d)\n", data, m_mode); + break; + + case 0x13c/4: // bit 1 = VBL disable (1=no interrupts) + m_vbl_disable = (data & 2) ? 1 : 0; + break; + + case 0x148/4: // write 1 here to clear interrupt + if (data == 1) + { + lower_slot_irq(); + } + break; + + default: + break; + } +} + +READ32_MEMBER( jmfb_device::mac_48gc_r ) +{ +// printf("48gc_r: @ %x, mask %08x [PC=%x]\n", offset, mem_mask, m_maincpu->safe_pc()); + + switch (offset) + { + case 0: + return 0x0c00; // sense 13" RGB for now +// return 0x0000; // sense "RGB Kong" monitor + + case 0x1c0/4: + m_toggle ^= 0xffffffff; + return m_toggle; + } + + return 0; +} |