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https://github.com/holub/mame
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free220: Fix video emulation, add NVRAM, add aux port, mark working
Graphics still need work, but its usable as a terminal now. Systems promoted to working --------------------------- Liberty Electronics Freedom 220
This commit is contained in:
Dirk Best
parent
46095704f1
commit
87dc49048b
@ -26,8 +26,15 @@
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- Expansion slot
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TODO:
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- Fix and improve video emulation
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- Aux port
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- Font selection
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- Light/dark background
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- Double sized characters
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- Soft scroll
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- Pixel clock, characters should be 9 pixels?
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Notes:
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- On first boot you will get an "error 8" - this is because
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RAM is uninitialized.
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****************************************************************************/
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@ -37,6 +44,7 @@
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#include "cpu/z80/z80.h"
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#include "machine/i8251.h"
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#include "machine/input_merger.h"
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#include "machine/nvram.h"
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#include "machine/pit8253.h"
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#include "video/scn2674.h"
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@ -67,8 +75,7 @@ public:
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m_translate(*this, "translate"),
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m_charram(*this, "charram%u", 0U),
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m_attrram(*this, "attrram%u", 0U),
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m_current_line(0),
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m_nmi_enabled(false)
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m_video_ctrl(0x00)
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{ }
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void freedom220(machine_config &config);
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@ -88,20 +95,16 @@ private:
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required_shared_ptr_array<uint8_t, 2> m_charram;
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required_shared_ptr_array<uint8_t, 2> m_attrram;
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uint8_t m_current_line;
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bool m_nmi_enabled;
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uint8_t m_video_ctrl;
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void mem_map(address_map &map);
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void io_map(address_map &map);
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void row_buffer_map(address_map &map);
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uint8_t mbc_char_r(offs_t offset);
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uint8_t mbc_attr_r(offs_t offset);
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void char_map(address_map &map);
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void attr_map(address_map &map);
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void avdc_intr_w(int state);
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void avdc_breq_w(int state);
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void video_ctrl_w(uint8_t data);
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SCN2674_DRAW_CHARACTER_MEMBER(draw_character);
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void nmi_control_w(uint8_t data);
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};
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@ -116,7 +119,7 @@ void freedom220_state::mem_map(address_map &map)
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map(0x8800, 0x8fff).ram().share(m_attrram[0]);
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map(0x9000, 0x97ff).ram().share(m_charram[1]);
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map(0x9800, 0x9fff).ram().share(m_attrram[1]);
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map(0xa000, 0xafff).ram();
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map(0xa000, 0xafff).ram().share("nvram");
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}
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void freedom220_state::io_map(address_map &map)
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@ -127,7 +130,7 @@ void freedom220_state::io_map(address_map &map)
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map(0x40, 0x41).rw(m_usart[0], FUNC(i8251_device::read), FUNC(i8251_device::write));
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map(0x60, 0x61).rw(m_usart[1], FUNC(i8251_device::read), FUNC(i8251_device::write));
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map(0x80, 0x81).rw(m_usart[2], FUNC(i8251_device::read), FUNC(i8251_device::write));
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map(0xa0, 0xa0).w(FUNC(freedom220_state::nmi_control_w));
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map(0xa0, 0xa0).w(FUNC(freedom220_state::video_ctrl_w));
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}
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@ -135,40 +138,38 @@ void freedom220_state::io_map(address_map &map)
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// VIDEO EMULATION
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//**************************************************************************
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void freedom220_state::row_buffer_map(address_map &map)
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void freedom220_state::char_map(address_map &map)
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{
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map.global_mask(0xff);
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map(0x00, 0xff).ram();
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map(0x0000, 0x07ff).ram().share(m_charram[0]);
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map(0x1000, 0x17ff).ram().share(m_charram[1]);
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map(0x2000, 0x2fff).ram().share("nvram");
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}
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uint8_t freedom220_state::mbc_char_r(offs_t offset)
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void freedom220_state::attr_map(address_map &map)
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{
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if (offset >= 0x800)
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logerror("%d read char offset %04x\n", m_current_line, offset);
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return m_charram[0][(m_current_line * 0x50 + offset) & 0x7ff];
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}
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uint8_t freedom220_state::mbc_attr_r(offs_t offset)
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{
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return m_attrram[0][(m_current_line * 0x50 + offset) & 0x7ff];
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map(0x0000, 0x07ff).ram().share(m_attrram[0]);
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map(0x1000, 0x17ff).ram().share(m_attrram[1]);
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map(0x2000, 0x2fff).ram().share("nvram");
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}
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void freedom220_state::avdc_intr_w(int state)
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{
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if (state && m_nmi_enabled)
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if (state)
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m_maincpu->pulse_input_line(INPUT_LINE_NMI, attotime::zero);
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}
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void freedom220_state::avdc_breq_w(int state)
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void freedom220_state::video_ctrl_w(uint8_t data)
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{
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if (state)
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{
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if (m_screen->vblank())
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m_current_line = 0;
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else
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m_current_line++;
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}
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// 7------- unknown
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// -6------ unknown
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// --5----- unknown
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// ---432-- font select
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// ------1- normal/reverse video
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// -------0 unknown
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logerror("video_ctrl_w: %02x\n", data);
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m_video_ctrl = data;
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}
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SCN2674_DRAW_CHARACTER_MEMBER( freedom220_state::draw_character )
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@ -197,8 +198,7 @@ SCN2674_DRAW_CHARACTER_MEMBER( freedom220_state::draw_character )
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if (BIT(attrcode, 2))
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data = ~data;
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// TODO
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if (0 && cursor)
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if (cursor)
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data = ~data;
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// foreground/background colors
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@ -230,25 +230,14 @@ GFXDECODE_END
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// MACHINE EMULATION
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//**************************************************************************
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void freedom220_state::nmi_control_w(uint8_t data)
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{
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logerror("nmi_control_w: %02x\n", data);
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// unknown if a simple write is enough
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m_nmi_enabled = true;
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}
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void freedom220_state::machine_start()
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{
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// register for save states
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save_item(NAME(m_current_line));
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save_item(NAME(m_nmi_enabled));
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save_item(NAME(m_video_ctrl));
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}
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void freedom220_state::machine_reset()
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{
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m_nmi_enabled = false;
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// allow data to be send to keyboard
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m_usart[2]->write_dsr(1);
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m_usart[2]->write_cts(0);
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@ -268,6 +257,8 @@ void freedom220_state::freedom220(machine_config &config)
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input_merger_device &irq(INPUT_MERGER_ANY_HIGH(config, "irq"));
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irq.output_handler().set_inputline("maincpu", INPUT_LINE_IRQ0);
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NVRAM(config, "nvram", nvram_device::DEFAULT_ALL_0);
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SCREEN(config, m_screen, SCREEN_TYPE_RASTER);
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m_screen->set_color(rgb_t::green());
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m_screen->set_raw(16000000, 768, 0, 640, 321, 0, 300); // clock unverified
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@ -279,14 +270,11 @@ void freedom220_state::freedom220(machine_config &config)
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SCN2674(config, m_avdc, 16000000 / 8); // clock unverified
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m_avdc->intr_callback().set(FUNC(freedom220_state::avdc_intr_w));
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m_avdc->breq_callback().set(FUNC(freedom220_state::avdc_breq_w));
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m_avdc->set_screen(m_screen);
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m_avdc->set_character_width(8); // unverified
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m_avdc->set_addrmap(0, &freedom220_state::row_buffer_map);
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m_avdc->set_addrmap(1, &freedom220_state::row_buffer_map);
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m_avdc->set_addrmap(0, &freedom220_state::char_map);
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m_avdc->set_addrmap(1, &freedom220_state::attr_map);
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m_avdc->set_display_callback(FUNC(freedom220_state::draw_character));
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m_avdc->mbc_char_callback().set(FUNC(freedom220_state::mbc_char_r));
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m_avdc->mbc_attr_callback().set(FUNC(freedom220_state::mbc_attr_r));
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pit8253_device &pit(PIT8253(config, "pit", 0));
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pit.set_clk<0>(18.432_MHz_XTAL / 10);
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@ -306,15 +294,23 @@ void freedom220_state::freedom220(machine_config &config)
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m_usart[0]->rts_handler().set("mainport", FUNC(rs232_port_device::write_rts));
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I8251(config, m_usart[1], 0); // unknown clock
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m_usart[1]->rxrdy_handler().set("irq", FUNC(input_merger_device::in_w<2>));
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m_usart[1]->txrdy_handler().set("irq", FUNC(input_merger_device::in_w<3>));
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m_usart[1]->txd_handler().set("auxport", FUNC(rs232_port_device::write_txd));
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m_usart[1]->rts_handler().set("auxport", FUNC(rs232_port_device::write_rts));
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I8251(config, m_usart[2], 0); // unknown clock
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m_usart[2]->rxrdy_handler().set("irq", FUNC(input_merger_device::in_w<2>));
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m_usart[2]->rxrdy_handler().set("irq", FUNC(input_merger_device::in_w<4>));
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m_usart[2]->txd_handler().set("kbd", FUNC(freedom220_kbd_device::rx_w));
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rs232_port_device &mainport(RS232_PORT(config, "mainport", default_rs232_devices, nullptr));
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mainport.rxd_handler().set(m_usart[0], FUNC(i8251_device::write_rxd));
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mainport.cts_handler().set(m_usart[0], FUNC(i8251_device::write_cts));
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rs232_port_device &auxport(RS232_PORT(config, "auxport", default_rs232_devices, nullptr));
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auxport.rxd_handler().set(m_usart[1], FUNC(i8251_device::write_rxd));
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auxport.cts_handler().set(m_usart[1], FUNC(i8251_device::write_cts));
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freedom220_kbd_device &kbd(FREEDOM220_KBD(config, "kbd"));
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kbd.tx_handler().set(m_usart[2], FUNC(i8251_device::write_rxd));
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}
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@ -346,4 +342,4 @@ ROM_END
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//**************************************************************************
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// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS
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COMP( 1984, free220, 0, 0, freedom220, 0, freedom220_state, empty_init, "Liberty Electronics", "Freedom 220", MACHINE_NOT_WORKING | MACHINE_NO_SOUND | MACHINE_SUPPORTS_SAVE )
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COMP( 1984, free220, 0, 0, freedom220, 0, freedom220_state, empty_init, "Liberty Electronics", "Freedom 220", MACHINE_IMPERFECT_GRAPHICS | MACHINE_NO_SOUND | MACHINE_SUPPORTS_SAVE )
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@ -17,6 +17,7 @@
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Notes:
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- Also used by the Freedom 200?
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- Data transfer with 1200 baud, 8n1
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***************************************************************************/
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@ -42,7 +43,7 @@ void freedom220_kbd_device::mem_map(address_map &map)
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void freedom220_kbd_device::io_map(address_map &map)
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{
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map(0x00, 0xff).r(FUNC(freedom220_kbd_device::select_r));
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map(0x00, 0xff).rw(FUNC(freedom220_kbd_device::select_r), FUNC(freedom220_kbd_device::speaker_w));
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}
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//-------------------------------------------------
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@ -277,6 +278,11 @@ uint8_t freedom220_kbd_device::select_r(offs_t offset)
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return 0;
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}
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void freedom220_kbd_device::speaker_w(offs_t offset, uint8_t data)
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{
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// TODO
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}
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uint8_t freedom220_kbd_device::p1_r()
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{
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return m_keys[m_select]->read();
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@ -45,6 +45,7 @@ private:
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void io_map(address_map &map);
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uint8_t select_r(offs_t offset);
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void speaker_w(offs_t offset, uint8_t data);
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uint8_t p1_r();
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void p2_w(uint8_t data);
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