diff options
Diffstat (limited to 'src/devices/bus/nubus/nubus_vikbw.cpp')
-rw-r--r-- | src/devices/bus/nubus/nubus_vikbw.cpp | 174 |
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; +} |