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Diffstat (limited to 'src/devices/bus/nubus/nubus_vikbw.cpp')
-rw-r--r--src/devices/bus/nubus/nubus_vikbw.cpp174
1 files changed, 174 insertions, 0 deletions
diff --git a/src/devices/bus/nubus/nubus_vikbw.cpp b/src/devices/bus/nubus/nubus_vikbw.cpp
new file mode 100644
index 00000000000..52e30c0ca92
--- /dev/null
+++ b/src/devices/bus/nubus/nubus_vikbw.cpp
@@ -0,0 +1,174 @@
+// license:BSD-3-Clause
+// copyright-holders:R. Belmont
+/***************************************************************************
+
+ Viking 1024x768 fixed-resolution monochrome board
+
+ VRAM from Fs040000 to Fs0517FF
+ Read from Fs000000 enables VBL, write to Fs000000 disables VBL
+ Write to Fs080000 acks VBL
+
+***************************************************************************/
+
+#include "emu.h"
+#include "nubus_vikbw.h"
+
+#define VIKBW_SCREEN_NAME "vikbw_screen"
+#define VIKBW_ROM_REGION "vikbw_rom"
+
+#define VRAM_SIZE (0x18000) // 1024x768 @ 1bpp is 98,304 bytes (0x18000)
+
+MACHINE_CONFIG_FRAGMENT( vikbw )
+ MCFG_SCREEN_ADD( VIKBW_SCREEN_NAME, RASTER)
+ MCFG_SCREEN_UPDATE_DEVICE(DEVICE_SELF, nubus_vikbw_device, screen_update)
+ MCFG_SCREEN_SIZE(1024,768)
+ MCFG_SCREEN_VISIBLE_AREA(0, 1024-1, 0, 768-1)
+ MCFG_SCREEN_REFRESH_RATE(70)
+MACHINE_CONFIG_END
+
+ROM_START( vikbw )
+ ROM_REGION(0x2000, VIKBW_ROM_REGION, 0)
+ ROM_LOAD( "viking.bin", 0x000000, 0x002000, CRC(92cf04d1) SHA1(d08349edfc82a0bd5ea848e053e1712092308f74) )
+ROM_END
+
+//**************************************************************************
+// GLOBAL VARIABLES
+//**************************************************************************
+
+const device_type NUBUS_VIKBW = &device_creator<nubus_vikbw_device>;
+
+
+//-------------------------------------------------
+// machine_config_additions - device-specific
+// machine configurations
+//-------------------------------------------------
+
+machine_config_constructor nubus_vikbw_device::device_mconfig_additions() const
+{
+ return MACHINE_CONFIG_NAME( vikbw );
+}
+
+//-------------------------------------------------
+// rom_region - device-specific ROM region
+//-------------------------------------------------
+
+const rom_entry *nubus_vikbw_device::device_rom_region() const
+{
+ return ROM_NAME( vikbw );
+}
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// nubus_vikbw_device - constructor
+//-------------------------------------------------
+
+nubus_vikbw_device::nubus_vikbw_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ device_t(mconfig, NUBUS_VIKBW, "Moniterm Viking video card", tag, owner, clock, "nb_vikbw", __FILE__),
+ device_nubus_card_interface(mconfig, *this)
+{
+}
+
+nubus_vikbw_device::nubus_vikbw_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_nubus_card_interface(mconfig, *this)
+{
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void nubus_vikbw_device::device_start()
+{
+ UINT32 slotspace;
+
+ // set_nubus_device makes m_slot valid
+ set_nubus_device();
+ install_declaration_rom(this, VIKBW_ROM_REGION, true);
+
+ slotspace = get_slotspace();
+
+// printf("[vikbw %p] slotspace = %x\n", this, slotspace);
+
+ m_vram.resize(VRAM_SIZE);
+ install_bank(slotspace+0x40000, slotspace+0x40000+VRAM_SIZE-1, 0, 0, "bank_vikbw", &m_vram[0]);
+ install_bank(slotspace+0x940000, slotspace+0x940000+VRAM_SIZE-1, 0, 0, "bank_vikbw2", &m_vram[0]);
+
+ m_nubus->install_device(slotspace, slotspace+3, read32_delegate(FUNC(nubus_vikbw_device::viking_enable_r), this), write32_delegate(FUNC(nubus_vikbw_device::viking_disable_w), this));
+ m_nubus->install_device(slotspace+0x80000, slotspace+0x80000+3, read32_delegate(FUNC(nubus_vikbw_device::viking_ack_r), this), write32_delegate(FUNC(nubus_vikbw_device::viking_ack_w), this));
+}
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void nubus_vikbw_device::device_reset()
+{
+ m_vbl_disable = 1;
+ 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 nubus_vikbw_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
+{
+ UINT32 *scanline;
+ int x, y;
+ UINT8 pixels;
+
+ if (!m_vbl_disable)
+ {
+ raise_slot_irq();
+ }
+
+ for (y = 0; y < 768; y++)
+ {
+ scanline = &bitmap.pix32(y);
+ for (x = 0; x < 1024/8; x++)
+ {
+ pixels = m_vram[(y * 128) + (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)];
+ }
+ }
+
+ return 0;
+}
+
+WRITE32_MEMBER( nubus_vikbw_device::viking_ack_w )
+{
+ lower_slot_irq();
+}
+
+READ32_MEMBER( nubus_vikbw_device::viking_ack_r )
+{
+ return 0;
+}
+
+WRITE32_MEMBER( nubus_vikbw_device::viking_disable_w )
+{
+ m_vbl_disable = 1;
+}
+
+READ32_MEMBER( nubus_vikbw_device::viking_enable_r )
+{
+ m_vbl_disable = 0;
+ return 0;
+}