svi318: add support for the 80 column card (sv806)

scripts/src/bus.lua

@@ -2619,6 +2619,8 @@ if (BUSES["SVI_SLOT"]~=null) then
 		MAME_DIR .. "src/devices/bus/svi3x8/slot/sv801.h",
 		MAME_DIR .. "src/devices/bus/svi3x8/slot/sv803.cpp",
 		MAME_DIR .. "src/devices/bus/svi3x8/slot/sv803.h",
+		MAME_DIR .. "src/devices/bus/svi3x8/slot/sv806.cpp",
+		MAME_DIR .. "src/devices/bus/svi3x8/slot/sv806.h",
 		MAME_DIR .. "src/devices/bus/svi3x8/slot/sv807.cpp",
 		MAME_DIR .. "src/devices/bus/svi3x8/slot/sv807.h",
 	}

src/devices/bus/svi3x8/slot/cards.cpp

@@ -11,5 +11,6 @@
 SLOT_INTERFACE_START( svi_slot_cards )
 	SLOT_INTERFACE("sv801", SV801)
 	SLOT_INTERFACE("sv803", SV803)
+	SLOT_INTERFACE("sv806", SV806)
 	SLOT_INTERFACE("sv807", SV807)
 SLOT_INTERFACE_END

src/devices/bus/svi3x8/slot/cards.h

@@ -14,6 +14,7 @@
 #include "emu.h"
 #include "sv801.h"
 #include "sv803.h"
+#include "sv806.h"
 #include "sv807.h"
 
 SLOT_INTERFACE_EXTERN( svi_slot_cards );

src/devices/bus/svi3x8/slot/sv806.cpp

@@ -0,0 +1,150 @@
+// license:GPL-2.0+
+// copyright-holders:Dirk Best
+/***************************************************************************
+
+    SV-806 80 Column Cartridge for SVI-318/328
+
+***************************************************************************/
+
+#include "sv806.h"
+
+
+//**************************************************************************
+//  DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type SV806 = &device_creator<sv806_device>;
+
+//-------------------------------------------------
+//  rom_region - device-specific ROM region
+//-------------------------------------------------
+
+ROM_START( sv806 )
+	ROM_REGION(0x1000, "gfx", 0)
+	ROM_SYSTEM_BIOS(0, "en", "English Character Set")
+	ROMX_LOAD("sv806.ic27",   0x0000, 0x1000, CRC(850bc232) SHA1(ed45cb0e9bd18a9d7bd74f87e620f016a7ae840f), ROM_BIOS(1))
+	ROM_SYSTEM_BIOS(1, "se", "Swedish Character Set")
+	ROMX_LOAD("sv806se.ic27", 0x0000, 0x1000, CRC(daea8956) SHA1(3f16d5513ad35692488ae7d864f660e76c6e8ed3), ROM_BIOS(2))
+ROM_END
+
+const rom_entry *sv806_device::device_rom_region() const
+{
+	return ROM_NAME( sv806 );
+}
+
+//-------------------------------------------------
+//  machine_config_additions - device-specific
+//  machine configurations
+//-------------------------------------------------
+
+static MACHINE_CONFIG_FRAGMENT( sv806 )
+	MCFG_SCREEN_ADD_MONOCHROME("80col", RASTER, rgb_t::green)
+	MCFG_SCREEN_RAW_PARAMS((XTAL_12MHz / 6) * 8, 864, 0, 640, 317, 0, 192)
+	MCFG_SCREEN_UPDATE_DEVICE("crtc", hd6845_device, screen_update)
+
+	MCFG_PALETTE_ADD_MONOCHROME("palette")
+
+	MCFG_MC6845_ADD("crtc", HD6845, "80col", XTAL_12MHz / 6)
+	MCFG_MC6845_SHOW_BORDER_AREA(false)
+	MCFG_MC6845_CHAR_WIDTH(8)
+	MCFG_MC6845_UPDATE_ROW_CB(sv806_device, crtc_update_row)
+MACHINE_CONFIG_END
+
+machine_config_constructor sv806_device::device_mconfig_additions() const
+{
+	return MACHINE_CONFIG_NAME( sv806 );
+}
+
+
+//**************************************************************************
+//  LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+//  sv806_device - constructor
+//-------------------------------------------------
+
+sv806_device::sv806_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+	device_t(mconfig, SV806, "SV-806 80 Column Cartridge", tag, owner, clock, "sv806", __FILE__),
+	device_svi_slot_interface(mconfig, *this),
+	m_crtc(*this, "crtc"),
+	m_palette(*this, "palette"),
+	m_gfx(*this, "gfx"),
+	m_ram_enabled(0)
+{
+	m_ram = std::make_unique<UINT8[]>(0x800);
+	memset(m_ram.get(), 0xff, 0x800);
+}
+
+//-------------------------------------------------
+//  device_start - device-specific startup
+//-------------------------------------------------
+
+void sv806_device::device_start()
+{
+}
+
+
+//**************************************************************************
+//  IMPLEMENTATION
+//**************************************************************************
+
+MC6845_UPDATE_ROW( sv806_device::crtc_update_row )
+{
+	const pen_t *pen = m_palette->pens();
+
+	for (int i = 0; i < x_count; i++)
+	{
+		UINT8 data = m_gfx->u8((m_ram[(ma + i) & 0x7ff] << 4) | ra);
+
+		if (i == cursor_x)
+			data = 0xff;
+
+		bitmap.pix32(y, i * 8 + 0) = pen[BIT(data, 7)];
+		bitmap.pix32(y, i * 8 + 1) = pen[BIT(data, 6)];
+		bitmap.pix32(y, i * 8 + 2) = pen[BIT(data, 5)];
+		bitmap.pix32(y, i * 8 + 3) = pen[BIT(data, 4)];
+		bitmap.pix32(y, i * 8 + 4) = pen[BIT(data, 3)];
+		bitmap.pix32(y, i * 8 + 5) = pen[BIT(data, 2)];
+		bitmap.pix32(y, i * 8 + 6) = pen[BIT(data, 1)];
+		bitmap.pix32(y, i * 8 + 7) = pen[BIT(data, 0)];
+	}
+}
+
+READ8_MEMBER( sv806_device::mreq_r )
+{
+	if (offset >= 0xf000 && m_ram_enabled)
+	{
+		m_bus->ramdis_w(0);
+		return m_ram[offset & 0x7ff];
+	}
+
+	return 0xff;
+}
+
+WRITE8_MEMBER( sv806_device::mreq_w )
+{
+	if (offset >= 0xf000 && m_ram_enabled)
+	{
+		m_bus->ramdis_w(0);
+		m_ram[offset & 0x7ff] = data;
+	}
+}
+
+READ8_MEMBER( sv806_device::iorq_r )
+{
+	if (offset == 0x51)
+		return m_crtc->register_r(space, 0);
+
+	return 0xff;
+}
+
+WRITE8_MEMBER( sv806_device::iorq_w )
+{
+	switch (offset)
+	{
+	case 0x50: m_crtc->address_w(space, 0, data); break;
+	case 0x51: m_crtc->register_w(space, 0, data); break;
+	case 0x58: m_ram_enabled = data; break;
+	}
+}

src/devices/bus/svi3x8/slot/sv806.h

@@ -0,0 +1,55 @@
+// license:GPL-2.0+
+// copyright-holders:Dirk Best
+/***************************************************************************
+
+    SV-806 80 column card for SVI-318/328
+
+***************************************************************************/
+
+#pragma once
+
+#ifndef __SVI3X8_SLOT_SV806_H__
+#define __SVI3X8_SLOT_SV806_H__
+
+#include "emu.h"
+#include "slot.h"
+#include "video/mc6845.h"
+
+
+//**************************************************************************
+//  TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> sv806_device
+
+class sv806_device : public device_t, public device_svi_slot_interface
+{
+public:
+	// construction/destruction
+	sv806_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+	virtual DECLARE_READ8_MEMBER( mreq_r ) override;
+	virtual DECLARE_WRITE8_MEMBER( mreq_w ) override;
+	virtual DECLARE_READ8_MEMBER( iorq_r ) override;
+	virtual DECLARE_WRITE8_MEMBER( iorq_w ) override;
+
+	MC6845_UPDATE_ROW(crtc_update_row);
+
+protected:
+	virtual const rom_entry *device_rom_region() const override;
+	virtual machine_config_constructor device_mconfig_additions() const override;
+	virtual void device_start() override;
+
+private:
+	required_device<hd6845_device> m_crtc;
+	required_device<palette_device> m_palette;
+	required_memory_region m_gfx;
+
+	std::unique_ptr<UINT8[]> m_ram;
+	int m_ram_enabled;
+};
+
+// device type definition
+extern const device_type SV806;
+
+#endif // __SVI3X8_SLOT_SV806_H__