summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/bus/nubus/nubus_48gc.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/devices/bus/nubus/nubus_48gc.c')
-rw-r--r--src/devices/bus/nubus/nubus_48gc.c369
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;
+}