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Diffstat (limited to 'src/devices/bus/acorn/cms/4080term.cpp')
-rw-r--r--src/devices/bus/acorn/cms/4080term.cpp177
1 files changed, 177 insertions, 0 deletions
diff --git a/src/devices/bus/acorn/cms/4080term.cpp b/src/devices/bus/acorn/cms/4080term.cpp
new file mode 100644
index 00000000000..c282715b7ae
--- /dev/null
+++ b/src/devices/bus/acorn/cms/4080term.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+ CMS 40/80 Video Terminal Card
+
+ Part No. CMS 0010-3
+
+**********************************************************************/
+
+
+#include "emu.h"
+#include "4080term.h"
+#include "screen.h"
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+DEFINE_DEVICE_TYPE(CMS_4080TERM, cms_4080term_device, "cms_4080term", "CMS 40/80 Video Terminal Card")
+
+
+//-------------------------------------------------
+// gfx_layout cms_4080term_charlayout
+//-------------------------------------------------
+
+static const gfx_layout cms_4080term_charlayout =
+{
+ 8, 10, /* 8 x 10 characters */
+ 256, /* 256 characters */
+ 1, /* 1 bits per pixel */
+ { 0 }, /* no bitplanes */
+ /* x offsets */
+ { 7, 6, 5, 4, 3, 2, 1, 0 },
+ /* y offsets */
+ { 0, 8, 2 * 8, 3 * 8, 4 * 8, 5 * 8, 6 * 8, 7 * 8, 8 * 8, 9 * 8 },
+ 8 * 16 /* every char takes 16 bytes */
+};
+
+//-------------------------------------------------
+// GFXDECODE( gfx_cms_4080term )
+//-------------------------------------------------
+
+static GFXDECODE_START(gfx_cms_4080term)
+ GFXDECODE_ENTRY("ef9345", 0x2000, cms_4080term_charlayout, 0, 4)
+GFXDECODE_END
+
+//-------------------------------------------------
+// MACHINE_DRIVER( cms_4080term )
+//-------------------------------------------------
+
+ROM_START(cms_4080term)
+ ROM_REGION(0x4000, "ef9345", 0)
+ ROM_LOAD("charset.rom", 0x0000, 0x2000, BAD_DUMP CRC(b2f49eb3) SHA1(d0ef530be33bfc296314e7152302d95fdf9520fc)) // from dcvg5k
+ROM_END
+
+
+static DEVICE_INPUT_DEFAULTS_START(keyboard)
+ DEVICE_INPUT_DEFAULTS("RS232_TXBAUD", 0xff, RS232_BAUD_1200)
+ DEVICE_INPUT_DEFAULTS("RS232_STARTBITS", 0xff, RS232_STARTBITS_1)
+ DEVICE_INPUT_DEFAULTS("RS232_DATABITS", 0xff, RS232_DATABITS_8)
+ DEVICE_INPUT_DEFAULTS("RS232_PARITY", 0xff, RS232_PARITY_NONE)
+ DEVICE_INPUT_DEFAULTS("RS232_STOPBITS", 0xff, RS232_STOPBITS_2)
+DEVICE_INPUT_DEFAULTS_END
+
+//-------------------------------------------------
+// device_add_mconfig - add device configuration
+//-------------------------------------------------
+
+MACHINE_CONFIG_START(cms_4080term_device::device_add_mconfig)
+ /* video hardware */
+ device = &SCREEN(config, m_screen, SCREEN_TYPE_RASTER);
+ m_screen->set_refresh_hz(50);
+ m_screen->set_size(768, 312);
+ m_screen->set_visarea(0, 492 - 1, 0, 270 - 1);
+ MCFG_SCREEN_UPDATE_DEVICE("ef9345", ef9345_device, screen_update)
+
+ MCFG_DEVICE_ADD("gfxdecode", GFXDECODE, "palette", gfx_cms_4080term)
+ MCFG_PALETTE_ADD("palette", 8)
+
+ EF9345(config, m_ef9345, 0);
+ m_ef9345->set_screen("screen");
+ m_ef9345->set_palette_tag("palette");
+
+ MCFG_TIMER_DRIVER_ADD_SCANLINE("scantimer", cms_4080term_device, update_scanline, "screen", 0, 10)
+
+ VIA6522(config, m_via, 1_MHz_XTAL);
+ m_via->writepa_handler().set("cent_data_out", FUNC(output_latch_device::bus_w));
+ m_via->ca2_handler().set(m_centronics, FUNC(centronics_device::write_strobe));
+ m_via->irq_handler().set(FUNC(cms_4080term_device::bus_irq_w));
+
+ MOS6551(config, m_acia, 0);
+ m_acia->set_xtal(1.8432_MHz_XTAL);
+ m_acia->txd_handler().set(m_rs232, FUNC(rs232_port_device::write_txd));
+ m_acia->rts_handler().set(m_rs232, FUNC(rs232_port_device::write_rts));
+ m_acia->dtr_handler().set(m_rs232, FUNC(rs232_port_device::write_dtr));
+ m_acia->irq_handler().set(FUNC(cms_4080term_device::bus_irq_w));
+
+ RS232_PORT(config, m_rs232, default_rs232_devices, "keyboard");
+ m_rs232->set_option_device_input_defaults("keyboard", DEVICE_INPUT_DEFAULTS_NAME(keyboard));
+ m_rs232->rxd_handler().set(m_acia, FUNC(mos6551_device::write_rxd));
+ m_rs232->dcd_handler().set(m_acia, FUNC(mos6551_device::write_dcd));
+ m_rs232->dsr_handler().set(m_acia, FUNC(mos6551_device::write_dsr));
+ m_rs232->cts_handler().set(m_acia, FUNC(mos6551_device::write_cts));
+
+ /* printer */
+ CENTRONICS(config, m_centronics, centronics_devices, "printer");
+ m_centronics->ack_handler().set(m_via, FUNC(via6522_device::write_ca1));
+ MCFG_CENTRONICS_OUTPUT_LATCH_ADD("cent_data_out", "centronics")
+MACHINE_CONFIG_END
+
+
+const tiny_rom_entry *cms_4080term_device::device_rom_region() const
+{
+ return ROM_NAME( cms_4080term );
+}
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// cms_4080term_device - constructor
+//-------------------------------------------------
+
+cms_4080term_device::cms_4080term_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
+ : device_t(mconfig, CMS_4080TERM, tag, owner, clock)
+ , device_acorn_bus_interface(mconfig, *this)
+ , m_via(*this, "via")
+ , m_acia(*this, "acia")
+ , m_screen(*this, "screen")
+ , m_ef9345(*this, "ef9345")
+ , m_rs232(*this, "rs232")
+ , m_centronics(*this, "centronics")
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void cms_4080term_device::device_start()
+{
+ set_acorn_bus_device();
+ address_space &space = m_bus->memspace();
+
+ space.install_readwrite_handler(0xfd20, 0xfd2f, read8_delegate(FUNC(ef9345_device::data_r), m_ef9345.target()), write8_delegate(FUNC(ef9345_device::data_w), m_ef9345.target()));
+ space.install_readwrite_handler(0xfd30, 0xfd3f, read8_delegate(FUNC(via6522_device::read), m_via.target()), write8_delegate(FUNC(via6522_device::write), m_via.target()));
+ space.install_readwrite_handler(0xfd40, 0xfd4f, read8_delegate(FUNC(mos6551_device::read), m_acia.target()), write8_delegate(FUNC(mos6551_device::write), m_acia.target()));
+
+ uint8_t *FNT = memregion("ef9345")->base();
+ uint16_t dest = 0x2000;
+
+ /* Unscramble the chargen rom as the format is too complex for gfxdecode to handle unaided */
+ for (uint16_t a = 0; a < 8192; a += 4096)
+ for (uint16_t b = 0; b < 2048; b += 64)
+ for (uint16_t c = 0; c < 4; c++)
+ for (uint16_t d = 0; d < 64; d += 4)
+ FNT[dest++] = FNT[a | b | c | d];
+}
+
+
+//**************************************************************************
+// IMPLEMENTATION
+//**************************************************************************
+
+TIMER_DEVICE_CALLBACK_MEMBER(cms_4080term_device::update_scanline)
+{
+ m_ef9345->update_scanline((uint16_t)param);
+}
+
+WRITE_LINE_MEMBER(cms_4080term_device::bus_irq_w)
+{
+ m_bus->irq_w(state);
+}