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author arbee <rb6502@users.noreply.github.com>2020-03-15 21:43:38 -0400
committer arbee <rb6502@users.noreply.github.com>2020-03-15 21:43:38 -0400
commit6f3f0b805e77b89887be7b28a54921c1e89e8fb1 (patch)
tree13cb1a8dc6d30eb0bdbfd284f19ac606e7444f39 /src/devices/bus/nubus
parent7697fb631eb2e9c506d41b7c897c285dd7e92839 (diff)
mac: Initial support for the Sigma Designs LaserView monochrome NuBus video card [Al Kossow, R. Belmont]
Diffstat (limited to 'src/devices/bus/nubus')
-rw-r--r--src/devices/bus/nubus/laserview.cpp209
-rw-r--r--src/devices/bus/nubus/laserview.h50
2 files changed, 259 insertions, 0 deletions
diff --git a/src/devices/bus/nubus/laserview.cpp b/src/devices/bus/nubus/laserview.cpp
new file mode 100644
index 00000000000..e080f4a1276
--- /dev/null
+++ b/src/devices/bus/nubus/laserview.cpp
@@ -0,0 +1,209 @@
+// license:BSD-3-Clause
+// copyright-holders:R. Belmont
+/***************************************************************************
+
+ Sigma Designs fixed-resolution monochrome video card
+ 1664x1200 or 832x600 according to the ad, can't find the 1664 mode.
+
+ VRAM at Fs000000, mirrored at Fs900000.
+ Fs0BFFEC: write 0x04 to enable VBL, 0x01 to ack VBL
+
+***************************************************************************/
+
+#include "emu.h"
+#include "laserview.h"
+#include "screen.h"
+
+#define LASERVIEW_SCREEN_NAME "laserview_screen"
+#define LASERVIEW_ROM_REGION "laserview_rom"
+
+#define VRAM_SIZE (0x40000)
+
+ROM_START( laserview )
+ ROM_REGION(0x8000, LASERVIEW_ROM_REGION, 0)
+ ROM_LOAD( "lva-m2-00020_v3.00.bin", 0x000000, 0x008000, CRC(569d1fb7) SHA1(fd505505226abb5fea7c10ed14e8841077ef1be6) )
+ROM_END
+
+//**************************************************************************
+// GLOBAL VARIABLES
+//**************************************************************************
+
+DEFINE_DEVICE_TYPE(NUBUS_LASERVIEW, nubus_laserview_device, "nb_laserview", "Sigma Designs LaserView video card")
+
+
+//-------------------------------------------------
+// device_add_mconfig - add device configuration
+//-------------------------------------------------
+
+void nubus_laserview_device::device_add_mconfig(machine_config &config)
+{
+ screen_device &screen(SCREEN(config, LASERVIEW_SCREEN_NAME, SCREEN_TYPE_RASTER));
+ screen.set_screen_update(FUNC(nubus_laserview_device::screen_update));
+ screen.set_size(832,600);
+ screen.set_visarea(0, 832-1, 0, 600-1);
+ screen.set_refresh_hz(70);
+}
+
+//-------------------------------------------------
+// rom_region - device-specific ROM region
+//-------------------------------------------------
+
+const tiny_rom_entry *nubus_laserview_device::device_rom_region() const
+{
+ return ROM_NAME( laserview );
+}
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// nubus_laserview_device - constructor
+//-------------------------------------------------
+
+nubus_laserview_device::nubus_laserview_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
+ nubus_laserview_device(mconfig, NUBUS_LASERVIEW, tag, owner, clock)
+{
+}
+
+nubus_laserview_device::nubus_laserview_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_nubus_card_interface(mconfig, *this),
+ m_vbl_disable(0)
+{
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void nubus_laserview_device::device_start()
+{
+ uint32_t slotspace;
+
+ install_declaration_rom(this, LASERVIEW_ROM_REGION, true);
+
+ slotspace = get_slotspace();
+
+// printf("[laserview %p] slotspace = %x\n", this, slotspace);
+
+ m_vram.resize(VRAM_SIZE);
+ install_bank(slotspace, slotspace+VRAM_SIZE-1, "bank_laserview", &m_vram[0]);
+ install_bank(slotspace+0x900000, slotspace+0x900000+VRAM_SIZE-1, "bank_laserview2", &m_vram[0]);
+
+ nubus().install_device(slotspace+0xB0000, slotspace+0xBFFFF, read32_delegate(*this, FUNC(nubus_laserview_device::regs_r)), write32_delegate(*this, FUNC(nubus_laserview_device::regs_w)));
+}
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void nubus_laserview_device::device_reset()
+{
+ m_vbl_disable = 1;
+ m_prot_state = 0;
+ m_toggle = 0;
+ memset(&m_vram[0], 0, VRAM_SIZE);
+
+ m_palette[0] = rgb_t(255, 255, 255);
+ m_palette[1] = rgb_t(0, 0, 0);
+}
+
+/***************************************************************************
+
+ Viking 1024x768 B&W card section
+
+***************************************************************************/
+
+uint32_t nubus_laserview_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
+{
+ uint32_t *scanline;
+ int x, y;
+ uint8_t pixels;
+
+ if (!m_vbl_disable)
+ {
+ raise_slot_irq();
+ }
+
+ for (y = 0; y < 600; y++)
+ {
+ scanline = &bitmap.pix32(y);
+ for (x = 0; x < 832/8; x++)
+ {
+ pixels = m_vram[(y * 104) + (BYTE4_XOR_BE(x)) + 0x20];
+
+ *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)];
+ }
+ }
+
+ return 0;
+}
+
+WRITE32_MEMBER( nubus_laserview_device::regs_w )
+{
+// printf("%08x to regs @ %x mask %08x\n", data, offset, mem_mask);
+
+ switch (offset)
+ {
+ case 0x3ffb:
+ if ((data & 0xff) == 0x04)
+ {
+ m_vbl_disable = 0;
+ }
+ else if ((data & 0xff) == 01)
+ {
+ lower_slot_irq();
+ }
+ else
+ {
+ m_vbl_disable = 1;
+ lower_slot_irq();
+ }
+ break;
+ }
+
+}
+
+READ32_MEMBER( nubus_laserview_device::regs_r )
+{
+ //f (offset != 0x3fc1) printf("Read regs_r @ %x mask %08x\n", offset, mem_mask);
+
+ switch (offset)
+ {
+ case 0x3fc1:
+ m_toggle ^= 1;
+ if (m_toggle)
+ {
+ return 0x01010101;
+ }
+ else
+ {
+ return 0;
+ }
+ machine().debug_break();
+ break;
+
+ case 0x3fc2:
+ if (m_prot_state == 0)
+ {
+ m_prot_state = 1;
+ return 0;
+ }
+ return 0x02000000;
+
+ case 0x3fff:
+ m_prot_state = 0;
+ return 0xfeffffff;
+ }
+
+ return 0xffffffff;
+}
+
diff --git a/src/devices/bus/nubus/laserview.h b/src/devices/bus/nubus/laserview.h
new file mode 100644
index 00000000000..a21a1aeed26
--- /dev/null
+++ b/src/devices/bus/nubus/laserview.h
@@ -0,0 +1,50 @@
+// license:BSD-3-Clause
+// copyright-holders:R. Belmont
+#ifndef MAME_BUS_NUBUS_LASERVIEW_H
+#define MAME_BUS_NUBUS_LASERVIEW_H
+
+#pragma once
+
+#include "nubus.h"
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> nubus_laserview_device
+
+class nubus_laserview_device :
+ public device_t,
+ public device_nubus_card_interface
+{
+public:
+ // construction/destruction
+ nubus_laserview_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+protected:
+ nubus_laserview_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock);
+
+ // device-level overrides
+ virtual void device_start() override;
+ virtual void device_reset() override;
+
+ // optional information overrides
+ virtual void device_add_mconfig(machine_config &config) override;
+ virtual const tiny_rom_entry *device_rom_region() const override;
+
+private:
+ DECLARE_READ32_MEMBER(regs_r);
+ DECLARE_WRITE32_MEMBER(regs_w);
+
+ uint32_t screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
+
+ std::vector<uint8_t> m_vram;
+ uint32_t m_vbl_disable, m_palette[2];
+ int m_prot_state;
+ int m_toggle;
+};
+
+// device type definition
+DECLARE_DEVICE_TYPE(NUBUS_LASERVIEW, nubus_laserview_device)
+
+#endif // MAME_BUS_NUBUS_LASERVIEW_H