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dim68k: add DUART, use views for boot-time bankswitch, some minor cleanup [R. Belmont]
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@ -1,33 +1,25 @@
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// license:BSD-3-Clause
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// copyright-holders:Robbbert
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// copyright-holders:R. Belmont, Robbbert
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/***************************************************************************
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Micro Craft Dimension 68000
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28/12/2011 Skeleton driver.
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This computer had the facility for plug-in cards to emulate popular
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computers of the time such as apple, trs80, kaypro, etc. The floppy
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disk parameters could be set to be able to read the disks of the
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various systems, or you create any other format you wished.
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computers of the time such as the Apple II Plus, TRS80, Kaypro, etc.
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The floppy disk parameters could be set to be able to read the disks
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of the emulated systems, or you create any other format you wished.
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There is no schematic available, so not fully able to emulate at
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this time.
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ToDo:
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- Floppy controller
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- Floppy formats (not sure if MESS supports user-defined formats)
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TODO:
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- Floppy controller hookup and boot CP/M 68K
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- Floppy formats
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- Banking
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- Graphics display (including colour and video_control options)
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- DUART
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- RTC
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- RS232 interface
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- Keyboard
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- Serial keyboard (300 8/N/1)
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- Centronics printer
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- Video-high
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- Video-reset
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- Game switches, paddles and timers
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- Game switches, paddles and timers (which work almost identically to the Apple II)
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- The plug-in boards
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- Emulator trap function
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@ -36,7 +28,7 @@
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#include "emu.h"
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#include "cpu/m68000/m68000.h"
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#include "imagedev/floppy.h"
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#include "machine/keyboard.h"
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#include "machine/mc68681.h"
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#include "machine/upd765.h"
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#include "sound/spkrdev.h"
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#include "video/mc6845.h"
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@ -56,17 +48,18 @@ public:
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, m_ram(*this, "ram")
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, m_palette(*this, "palette")
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, m_p_chargen(*this, "chargen")
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, m_duart(*this, "duart")
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, m_bootview(*this, "bootview")
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{ }
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void dim68k(machine_config &config);
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private:
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u16 dim68k_duart_r(offs_t offset);
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u16 dim68k_fdc_r();
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u16 dim68k_game_switches_r();
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u16 dim68k_speaker_r();
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u16 dim68k_banksw_r();
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void dim68k_banksw_w(u16 data);
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void dim68k_duart_w(u16 data);
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void dim68k_fdc_w(u16 data);
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void dim68k_printer_strobe_w(u16 data);
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void dim68k_reset_timers_w(u16 data);
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@ -74,36 +67,25 @@ private:
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void dim68k_video_control_w(u16 data);
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void dim68k_video_high_w(u16 data);
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void dim68k_video_reset_w(u16 data);
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void kbd_put(u8 data);
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MC6845_UPDATE_ROW(crtc_update_row);
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void mem_map(address_map &map);
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bool m_speaker_bit;
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u8 m_video_control;
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u8 m_term_data;
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void machine_reset() override;
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void machine_start() override;
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required_device<cpu_device> m_maincpu;
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required_device<mc6845_device> m_crtc;
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required_device<speaker_sound_device> m_speaker;
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required_shared_ptr<uint16_t> m_ram;
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required_device<palette_device> m_palette;
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required_region_ptr<u8> m_p_chargen;
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required_device<scn2681_device> m_duart;
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memory_view m_bootview;
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};
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u16 dim68k_state::dim68k_duart_r(offs_t offset)
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// Port A is for the keyboard : 300 baud, no parity, 8 bits, 1 stop bit. Port B is for RS232.
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// The device also controls the parallel printer (except the strobe) and the RTC.
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// Device = SCN2681, not emulated. The keyboard is standard ASCII, so we can use the terminal
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// keyboard for now.
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{
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if (offset==3)
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return m_term_data;
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else
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return 0;
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}
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u16 dim68k_state::dim68k_fdc_r()
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{
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return 0;
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@ -171,10 +153,6 @@ void dim68k_state::dim68k_video_reset_w(u16 data)
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{
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}
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void dim68k_state::dim68k_duart_w(u16 data)
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{
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}
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void dim68k_state::dim68k_reset_timers_w(u16 data)
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// reset game port timer before reading paddles
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{
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@ -185,38 +163,53 @@ void dim68k_state::dim68k_printer_strobe_w(u16 data)
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{
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}
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void dim68k_state::dim68k_banksw_w(u16 data)
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// At boot time, the rom and IO occupy 0-FFFF, this moves it to the proper place
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u16 dim68k_state::dim68k_banksw_r()
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{
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m_bootview.disable();
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return 0xffff;
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}
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void dim68k_state::dim68k_banksw_w(u16 data)
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{
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m_bootview.disable();
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}
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void dim68k_state::mem_map(address_map &map)
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{
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map.unmap_value_high();
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map(0x00000000, 0x00feffff).ram().share("ram"); // 16MB RAM / ROM at boot
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map(0x00ff0000, 0x00ff1fff).rom().region("bootrom", 0);
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map(0x00ff2000, 0x00ff7fff).ram(); // Graphics Video RAM
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map(0x00ff8001, 0x00ff8001).rw(m_crtc, FUNC(mc6845_device::status_r), FUNC(mc6845_device::address_w));
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map(0x00ff8003, 0x00ff8003).rw(m_crtc, FUNC(mc6845_device::register_r), FUNC(mc6845_device::register_w));
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map(0x00ff8004, 0x00ff8005).w(FUNC(dim68k_state::dim68k_video_high_w));
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map(0x00ff8008, 0x00ff8009).w(FUNC(dim68k_state::dim68k_video_control_w));
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map(0x00ff800a, 0x00ff800b).w(FUNC(dim68k_state::dim68k_video_reset_w));
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map(0x00ff8800, 0x00ff8fff).rom().region("cop6512", 0); // slot 1 controller rom
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map(0x00ff9000, 0x00ff97ff).rom().region("copz80", 0); // slot 2 controller rom
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map(0x00ff9800, 0x00ff9fff).rom().region("cop8086", 0); // slot 3 controller rom
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map(0x000000, 0x7fffff).ram().share("ram"); // 8 MiB of RAM
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map(0x000000, 0x00ffff).view(m_bootview);
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m_bootview[0](0x000000, 0x001fff).rom().region("bootrom", 0);
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// graphics VRAM is not used by the stub before the bankswitch occurs, so it's not mapped here
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m_bootview[0](0x008001, 0x008001).rw(m_crtc, FUNC(mc6845_device::status_r), FUNC(mc6845_device::address_w));
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m_bootview[0](0x008003, 0x008003).rw(m_crtc, FUNC(mc6845_device::register_r), FUNC(mc6845_device::register_w));
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m_bootview[0](0x008004, 0x008005).w(FUNC(dim68k_state::dim68k_video_high_w));
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m_bootview[0](0x008008, 0x008009).w(FUNC(dim68k_state::dim68k_video_control_w));
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m_bootview[0](0x00800a, 0x00800b).w(FUNC(dim68k_state::dim68k_video_reset_w));
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m_bootview[0](0x00dc00, 0x00dc01).rw(FUNC(dim68k_state::dim68k_banksw_r), FUNC(dim68k_state::dim68k_banksw_w));
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map(0xff0000, 0xff1fff).rom().region("bootrom", 0);
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map(0xff2000, 0xff7fff).ram(); // Graphics Video RAM
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map(0xff8001, 0xff8001).rw(m_crtc, FUNC(mc6845_device::status_r), FUNC(mc6845_device::address_w));
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map(0xff8003, 0xff8003).rw(m_crtc, FUNC(mc6845_device::register_r), FUNC(mc6845_device::register_w));
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map(0xff8004, 0xff8005).w(FUNC(dim68k_state::dim68k_video_high_w));
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map(0xff8008, 0xff8009).w(FUNC(dim68k_state::dim68k_video_control_w));
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map(0xff800a, 0xff800b).w(FUNC(dim68k_state::dim68k_video_reset_w));
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map(0xff8800, 0xff8fff).rom().region("cop6512", 0); // slot 1 controller rom
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map(0xff9000, 0xff97ff).rom().region("copz80", 0); // slot 2 controller rom
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map(0xff9800, 0xff9fff).rom().region("cop8086", 0); // slot 3 controller rom
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#if 0
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map(0x00ffa000, 0x00ffa7ff).rom(); // slot 4 controller rom
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map(0x00ffa800, 0x00ffafff).rom(); // slot 5 controller rom
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map(0x00ffb000, 0x00ffb7ff).rom(); // slot 6 controller rom
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map(0xffa000, 0xffa7ff).rom(); // slot 4 controller rom
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map(0xffa800, 0xffafff).rom(); // slot 5 controller rom
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map(0xffb000, 0xffb7ff).rom(); // slot 6 controller rom
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#endif
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map(0x00ffc400, 0x00ffc41f).rw(FUNC(dim68k_state::dim68k_duart_r), FUNC(dim68k_state::dim68k_duart_w)); // Signetics SCN2681AC1N40 Dual UART
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map(0x00ffc800, 0x00ffc801).rw(FUNC(dim68k_state::dim68k_speaker_r), FUNC(dim68k_state::dim68k_speaker_w));
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map(0x00ffcc00, 0x00ffcc1f).rw(FUNC(dim68k_state::dim68k_game_switches_r), FUNC(dim68k_state::dim68k_reset_timers_w));
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map(0x00ffd000, 0x00ffd003).m("fdc", FUNC(upd765a_device::map)).umask16(0x00ff); // NEC uPD765A
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map(0x00ffd004, 0x00ffd005).rw(FUNC(dim68k_state::dim68k_fdc_r), FUNC(dim68k_state::dim68k_fdc_w));
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map(0xffc400, 0xffc41f).rw(m_duart, FUNC(scn2681_device::read), FUNC(scn2681_device::write)).umask16(0x00ff);
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map(0xffc800, 0xffc801).rw(FUNC(dim68k_state::dim68k_speaker_r), FUNC(dim68k_state::dim68k_speaker_w));
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map(0xffcc00, 0xffcc1f).rw(FUNC(dim68k_state::dim68k_game_switches_r), FUNC(dim68k_state::dim68k_reset_timers_w));
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map(0xffd000, 0xffd003).m("fdc", FUNC(upd765a_device::map)).umask16(0x00ff); // NEC uPD765A
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map(0xffd004, 0xffd005).rw(FUNC(dim68k_state::dim68k_fdc_r), FUNC(dim68k_state::dim68k_fdc_w));
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//map(0x00ffd400, 0x00ffd403) emulation trap control
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map(0x00ffd800, 0x00ffd801).w(FUNC(dim68k_state::dim68k_printer_strobe_w));
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map(0x00ffdc00, 0x00ffdc01).w(FUNC(dim68k_state::dim68k_banksw_w));
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map(0xffd800, 0xffd801).w(FUNC(dim68k_state::dim68k_printer_strobe_w));
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map(0xffdc00, 0xffdc01).rw(FUNC(dim68k_state::dim68k_banksw_r), FUNC(dim68k_state::dim68k_banksw_w));
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}
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/* Input ports */
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@ -306,16 +299,10 @@ static void dim68k_floppies(device_slot_interface &device)
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device.option_add("525hd", FLOPPY_525_HD);
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}
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void dim68k_state::kbd_put(u8 data)
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{
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m_term_data = data;
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}
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void dim68k_state::machine_start()
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{
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save_item(NAME(m_speaker_bit));
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save_item(NAME(m_video_control));
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save_item(NAME(m_term_data));
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}
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void dim68k_state::dim68k(machine_config &config)
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@ -349,8 +336,7 @@ void dim68k_state::dim68k(machine_config &config)
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m_crtc->set_char_width(8);
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m_crtc->set_update_row_callback(FUNC(dim68k_state::crtc_update_row));
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generic_keyboard_device &keyboard(GENERIC_KEYBOARD(config, "keyboard", 0));
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keyboard.set_keyboard_callback(FUNC(dim68k_state::kbd_put));
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SCN2681(config, m_duart, 3.6864_MHz_XTAL);
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// software lists
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SOFTWARE_LIST(config, "flop_list").set_original("dim68k");
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