video/gf7600gs: add basic legacy VGA control

src/devices/video/gf7600gs.cpp

@@ -19,9 +19,22 @@ void geforce_7600gs_device::map3(address_map &map)
 
 geforce_7600gs_device::geforce_7600gs_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
 	: pci_device(mconfig, GEFORCE_7600GS, tag, owner, clock)
+	, m_vga(*this, "vga")
 {
 }
 
+void geforce_7600gs_device::device_add_mconfig(machine_config &config)
+{
+	screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
+	screen.set_raw(XTAL(25'174'800), 900, 0, 640, 526, 0, 480);
+	screen.set_screen_update(m_vga, FUNC(nvidia_nv3_vga_device::screen_update));
+
+	// TODO: very late superset (G73)
+	NVIDIA_NV3_VGA(config, m_vga, 0);
+	m_vga->set_screen("screen");
+	m_vga->set_vram_size(256*1024*1024);
+}
+
 void geforce_7600gs_device::device_start()
 {
 	pci_device::device_start();
@@ -35,3 +48,38 @@ void geforce_7600gs_device::device_reset()
 {
 	pci_device::device_reset();
 }
+
+void geforce_7600gs_device::legacy_memory_map(address_map &map)
+{
+	map(0xa0000, 0xbffff).rw(FUNC(geforce_7600gs_device::vram_r), FUNC(geforce_7600gs_device::vram_w));
+}
+
+void geforce_7600gs_device::legacy_io_map(address_map &map)
+{
+	map(0, 0x02f).m(m_vga, FUNC(nvidia_nv3_vga_device::io_map));
+}
+
+uint8_t geforce_7600gs_device::vram_r(offs_t offset)
+{
+	return downcast<nvidia_nv3_vga_device *>(m_vga.target())->mem_r(offset);
+}
+
+void geforce_7600gs_device::vram_w(offs_t offset, uint8_t data)
+{
+	downcast<nvidia_nv3_vga_device *>(m_vga.target())->mem_w(offset, data);
+}
+
+void geforce_7600gs_device::map_extra(uint64_t memory_window_start, uint64_t memory_window_end, uint64_t memory_offset, address_space *memory_space,
+							uint64_t io_window_start, uint64_t io_window_end, uint64_t io_offset, address_space *io_space)
+{
+	if (BIT(command, 1))
+	{
+		memory_space->install_readwrite_handler(0xa0000, 0xbffff, read8sm_delegate(*this, FUNC(geforce_7600gs_device::vram_r)), write8sm_delegate(*this, FUNC(geforce_7600gs_device::vram_w)));
+	}
+
+	if (BIT(command, 0))
+	{
+		io_space->install_device(0x03b0, 0x03df, *this, &geforce_7600gs_device::legacy_io_map);
+		//memory_space->install_rom(0xc0000, 0xcffff, (void *)expansion_rom);
+	}
+}

src/devices/video/gf7600gs.h

@@ -6,7 +6,9 @@
 #pragma once
 
 #include "machine/pci.h"
+#include "video/pc_vga_nvidia.h"
 
+// FIXME: PCIe x16
 class geforce_7600gs_device : public pci_device {
 public:
 	geforce_7600gs_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock, uint32_t subdevice_id)
@@ -16,14 +18,26 @@ public:
 	}
 	geforce_7600gs_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
 
+	void legacy_memory_map(address_map &map);
+	void legacy_io_map(address_map &map);
+
 protected:
 	virtual void device_start() override;
 	virtual void device_reset() override;
+	virtual void device_add_mconfig(machine_config &config) override;
+
+	virtual void map_extra(uint64_t memory_window_start, uint64_t memory_window_end, uint64_t memory_offset, address_space *memory_space,
+						   uint64_t io_window_start, uint64_t io_window_end, uint64_t io_offset, address_space *io_space) override;
 
 private:
 	void map1(address_map &map);
 	void map2(address_map &map);
 	void map3(address_map &map);
+
+	required_device<nvidia_nv3_vga_device> m_vga;
+
+	u8 vram_r(offs_t offset);
+	void vram_w(offs_t offset, uint8_t data);
 };
 
 DECLARE_DEVICE_TYPE(GEFORCE_7600GS, geforce_7600gs_device)

src/mame/sega/lindbergh.cpp

@@ -2,12 +2,23 @@
 // copyright-holders:Olivier Galibert
 /***************************************************************************
 
-    Sega Lindbergh skeleton driver
+Sega Lindbergh
 
 TODO:
 - tests area 0xd0000 - 0xd000f, wants an undumped ROM in there?
-    - Apparently there's no way to avoid a dead lock at 0xfd085, perhaps
-      tied to the aforementioned?
+- Pinpoint root cause of all of the following debug breakpoints
+  https://github.com/mamedev/mame/files/8766682/lindbergh_megahack.txt
+- bp fffffff0,1,{eip-=0x12 ;g} (spurious execution parse of below)
+- bp f4f1c,1,{eip+=2;g}
+- bp 78adb,1,{eip+=2;g}
+- bp f6bb3,1,{eip+=2;g}
+- bp 7518f,1,{eip+=2;g}
+- bp e7a22,1,{eip+=3;g}
+- bp e7abf,1,{eip+=3;g}
+- bp 79068,1,{eip+=2;g}
+- bp 78aed,1,{eip+=2;g}
+- BIOS detects CPU as :), throws errors 0270 (RTC), CMOS bad (0251) and
+  PCI resource conflict on SATA.
 
 ***************************************************************************