summaryrefslogtreecommitdiffstatshomepage
path: root/src/mess/drivers/v6809.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/mess/drivers/v6809.c')
-rw-r--r--src/mess/drivers/v6809.c290
1 files changed, 290 insertions, 0 deletions
diff --git a/src/mess/drivers/v6809.c b/src/mess/drivers/v6809.c
new file mode 100644
index 00000000000..3aa1fd9a96e
--- /dev/null
+++ b/src/mess/drivers/v6809.c
@@ -0,0 +1,290 @@
+/***************************************************************************
+
+ Vegas 6809
+
+ Skeleton driver
+
+Devices:
+
+MC6809 cpu
+MC6840 timer
+MM58174 RTC
+MB8876 (or FD1791) FDC
+SY6545-1 CRTC
+2x MC6821 PIA
+2x MC6850 ACIA
+
+Memory ranges:
+
+0000-EFFF RAM
+F000-F7FF Devices
+F800-FFFF ROM
+
+Monitor commands:
+
+D boot from floppy (launch Flex OS)
+F relaunch Flex
+G go
+M modify memory (. to exit)
+
+ToDo:
+
+- Colours (a photo shows colours but the schematic doesn't
+ have any ram for colours).
+
+- Connect the devices (RTC, FDC, PIAs, ACIAs, timer).
+
+- Find the missing character generator rom.
+
+- Add mirrors to the address map.
+
+- Add sound. Pressing BEL character issues commands to the timer chip.
+
+- Replace terminal keyboard with proper plug-in unit (no info).
+
+****************************************************************************/
+
+#include "emu.h"
+#include "cpu/m6809/m6809.h"
+#include "video/mc6845.h"
+//#include "imagedev/flopdrv.h"
+//#include "machine/6821pia.h"
+//#include "machine/6850acia.h"
+//#include "machine/wd17xx.h"
+#include "machine/keyboard.h"
+
+
+
+class v6809_state : public driver_device
+{
+public:
+ v6809_state(const machine_config &mconfig, device_type type, const char *tag)
+ : driver_device(mconfig, type, tag),
+ m_maincpu(*this, "maincpu"),
+ m_crtc(*this, "crtc"),
+ m_video_address(0)
+ { }
+
+ required_device<cpu_device> m_maincpu;
+ required_device<mc6845_device> m_crtc;
+ DECLARE_READ8_MEMBER(key_r);
+ DECLARE_READ8_MEMBER(status_r);
+ DECLARE_WRITE8_MEMBER(videoram_w);
+ DECLARE_WRITE8_MEMBER(v6809_address_w);
+ DECLARE_WRITE8_MEMBER(v6809_register_w);
+ DECLARE_WRITE8_MEMBER(kbd_put);
+ UINT8 *m_p_videoram;
+ const UINT8 *m_p_chargen;
+ UINT16 m_video_address;
+ UINT8 m_video_index;
+ UINT8 m_term_data;
+ UINT8 m_vidbyte;
+};
+
+
+static ADDRESS_MAP_START(v6809_mem, AS_PROGRAM, 8, v6809_state)
+ ADDRESS_MAP_UNMAP_HIGH
+ AM_RANGE(0x0000, 0xefff) AM_RAM
+ AM_RANGE(0xf000, 0xf000) AM_MIRROR(0xfe) AM_DEVREAD("crtc", mc6845_device, status_r) AM_WRITE(v6809_address_w)
+ AM_RANGE(0xf001, 0xf001) AM_MIRROR(0xfe) AM_DEVREAD("crtc", mc6845_device, register_r) AM_WRITE(v6809_register_w)
+ AM_RANGE(0xf200, 0xf200) AM_MIRROR(0xff) AM_WRITE(videoram_w)
+ //AM_RANGE(0xf505, 0xf506) acia-1 (modem)
+ //AM_RANGE(0xf50c, 0xf50d) acia-2 (printer)
+ //AM_RANGE(0xf600, 0xf603) AM_MIRROR(0x3c) disk controller
+ //AM_RANGE(0xf640, 0xf64f) AM_MIRROR(0x30) real time clock
+ //AM_RANGE(0xf680, 0xf683) AM_MIRROR(0x3c) pia-1 (disk & keyboard)
+ //AM_RANGE(0xf6c8, 0xf6cf) timer
+ //AM_RANGE(0xf6d0, 0xf6d3) pia-2
+ AM_RANGE(0xf800, 0xffff) AM_ROM
+
+ //temp
+ AM_RANGE(0xf682, 0xf682) AM_READ(key_r)
+ AM_RANGE(0xf683, 0xf683) AM_READ(status_r)
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START(v6809_io, AS_PROGRAM, 8, v6809_state)
+ AM_RANGE(0x0064, 0x0064) AM_WRITENOP
+ADDRESS_MAP_END
+
+
+/* Input ports */
+static INPUT_PORTS_START( v6809 )
+INPUT_PORTS_END
+
+// **** Video ****
+
+/* F4 Character Displayer */
+static const gfx_layout v6809_charlayout =
+{
+ 8, 10, /* 8 x 10 characters */
+ 256, /* 128 characters */
+ 1, /* 1 bits per pixel */
+ { 0 }, /* no bitplanes */
+ /* x offsets */
+ { 0, 1, 2, 3, 4, 5, 6, 7 },
+ /* y offsets */
+ { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 9*8 },
+ 8*16 /* every char takes 16 bytes */
+};
+
+static GFXDECODE_START( v6809 )
+ GFXDECODE_ENTRY( "chargen", 0x0000, v6809_charlayout, 0, 1 )
+GFXDECODE_END
+
+MC6845_UPDATE_ROW( v6809_update_row )
+{
+ v6809_state *state = device->machine().driver_data<v6809_state>();
+ const rgb_t *palette = palette_entry_list_raw(bitmap.palette());
+ UINT8 chr,gfx;
+ UINT16 mem,x;
+ UINT32 *p = &bitmap.pix32(y);
+
+ for (x = 0; x < x_count; x++)
+ {
+ mem = (ma + x) & 0x7ff;
+ chr = state->m_p_videoram[mem];
+ if (x == cursor_x)
+ gfx = 0xff;
+ else
+ gfx = state->m_p_chargen[(chr<<4) | ra];
+
+ /* Display a scanline of a character (8 pixels) */
+ *p++ = palette[BIT(gfx, 7)];
+ *p++ = palette[BIT(gfx, 6)];
+ *p++ = palette[BIT(gfx, 5)];
+ *p++ = palette[BIT(gfx, 4)];
+ *p++ = palette[BIT(gfx, 3)];
+ *p++ = palette[BIT(gfx, 2)];
+ *p++ = palette[BIT(gfx, 1)];
+ *p++ = palette[BIT(gfx, 0)];
+ }
+}
+
+MC6845_ON_UPDATE_ADDR_CHANGED( v6809_update_addr )
+{
+/* not sure what goes in here - parameters passed are device, address, strobe */
+ v6809_state *state = device->machine().driver_data<v6809_state>();
+ state->m_video_address = address & 0x7ff;
+}
+
+static VIDEO_START( v6809 )
+{
+ v6809_state *state = machine.driver_data<v6809_state>();
+ state->m_p_chargen = machine.root_device().memregion("chargen")->base();
+ state->m_p_videoram = state->memregion("videoram")->base();
+}
+
+static const mc6845_interface v6809_crtc = {
+ "screen", /* name of screen */
+ 8, /* number of dots per character */
+ NULL,
+ v6809_update_row, /* handler to display a scanline */
+ NULL,
+ DEVCB_NULL,
+ DEVCB_NULL,
+ DEVCB_NULL,
+ DEVCB_NULL,
+ v6809_update_addr /* handler to process transparent mode */
+};
+
+WRITE8_MEMBER( v6809_state::videoram_w )
+{
+ m_vidbyte = data;
+}
+
+WRITE8_MEMBER( v6809_state::v6809_address_w )
+{
+ m_crtc->address_w( space, 0, data );
+
+ m_video_index = data & 0x1f;
+
+ if (m_video_index == 31)
+ m_p_videoram[m_video_address] = m_vidbyte;
+}
+
+WRITE8_MEMBER( v6809_state::v6809_register_w )
+{
+ UINT16 temp = m_video_address;
+
+ m_crtc->register_w( space, 0, data );
+
+ // Get transparent address
+ if (m_video_index == 18)
+ m_video_address = ((data & 7) << 8 ) | (temp & 0xff);
+ else
+ if (m_video_index == 19)
+ m_video_address = data | (temp & 0xff00);
+}
+
+// **** Keyboard ****
+
+READ8_MEMBER( v6809_state::key_r )
+{
+ UINT8 ret = m_term_data;
+ m_term_data = 0;
+ return ret;
+}
+
+READ8_MEMBER( v6809_state::status_r )
+{
+ return (m_term_data) ? 0x80 : 0;
+}
+
+WRITE8_MEMBER( v6809_state::kbd_put )
+{
+ m_term_data = data;
+}
+
+static ASCII_KEYBOARD_INTERFACE( keyboard_intf )
+{
+ DEVCB_DRIVER_MEMBER(v6809_state, kbd_put)
+};
+
+// *** Machine ****
+
+static MACHINE_RESET(v6809)
+{
+}
+
+static MACHINE_CONFIG_START( v6809, v6809_state )
+ /* basic machine hardware */
+ MCFG_CPU_ADD("maincpu", M6809, XTAL_16MHz / 4)
+ MCFG_CPU_PROGRAM_MAP(v6809_mem)
+ MCFG_CPU_IO_MAP(v6809_io)
+
+ MCFG_MACHINE_RESET(v6809)
+
+ /* video hardware */
+ MCFG_SCREEN_ADD("screen", RASTER)
+ MCFG_SCREEN_REFRESH_RATE(50)
+ MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
+ MCFG_SCREEN_SIZE(640, 480)
+ MCFG_SCREEN_VISIBLE_AREA(0, 640-1, 0, 480-1)
+ MCFG_SCREEN_UPDATE_DEVICE("crtc", sy6545_1_device, screen_update)
+ MCFG_VIDEO_START(v6809)
+ MCFG_PALETTE_LENGTH(2)
+ MCFG_PALETTE_INIT(black_and_white)
+ MCFG_GFXDECODE(v6809)
+
+ /* Devices */
+ MCFG_MC6845_ADD("crtc", SY6545_1, XTAL_16MHz / 8, v6809_crtc)
+ MCFG_ASCII_KEYBOARD_ADD(KEYBOARD_TAG, keyboard_intf)
+MACHINE_CONFIG_END
+
+/* ROM definition */
+ROM_START( v6809 )
+ ROM_REGION( 0x10000, "maincpu", 0 )
+ ROM_LOAD( "v6809.rom", 0xf800, 0x0800, CRC(54bf5f32) SHA1(10d1d70f0b51e2b90e5c29249d3eab4c6b0033a1) )
+
+ ROM_REGION( 0x800, "videoram", ROMREGION_ERASE00 )
+
+ /* character generator not dumped, using the one from 'h19' for now */
+ ROM_REGION( 0x1000, "chargen", 0 )
+ ROM_LOAD( "2716_444-29_h19font.bin", 0x0000, 0x0800, BAD_DUMP CRC(d595ac1d) SHA1(130fb4ea8754106340c318592eec2d8a0deaf3d0))
+ ROM_RELOAD(0x0800, 0x0800)
+ROM_END
+
+/* Driver */
+
+/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME FLAGS */
+COMP( 1982, v6809, 0, 0, v6809, v6809, driver_device, 0, "Microkit", "Vegas 6809", GAME_NOT_WORKING | GAME_NO_SOUND)