diff options
Diffstat (limited to 'src/mess/machine/bk.c')
-rw-r--r-- | src/mess/machine/bk.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/src/mess/machine/bk.c b/src/mess/machine/bk.c new file mode 100644 index 00000000000..ef58b7595a2 --- /dev/null +++ b/src/mess/machine/bk.c @@ -0,0 +1,172 @@ +/*************************************************************************** + + BK machine driver by Miodrag Milanovic + + 10/03/2008 Preliminary driver. + +****************************************************************************/ + + +#include "emu.h" +#include "imagedev/cassette.h" +#include "machine/i8255.h" +#include "includes/bk.h" + + +static TIMER_CALLBACK(keyboard_callback) +{ + bk_state *state = machine.driver_data<bk_state>(); + UINT8 code, i, j; + static const char *const keynames[] = { + "LINE1", "LINE2", "LINE3", "LINE4", "LINE5", "LINE6", + "LINE7", "LINE8", "LINE9", "LINE10", "LINE11" + }; + + for(i = 1; i < 12; i++) + { + code = machine.root_device().ioport(keynames[i-1])->read(); + if (code != 0) + { + for(j = 0; j < 8; j++) + { + if (code == (1 << j)) + { + state->m_key_code = j + i*8; + break; + } + } + if ((machine.root_device().ioport("LINE0")->read() & 4) == 4) + { + if (i==6 || i==7) + { + state->m_key_code -= 16; + } + + } + if ((machine.root_device().ioport("LINE0")->read() & 4) == 4) + { + if (i>=8 && i<=11) + { + state->m_key_code += 32; + } + } + state->m_key_pressed = 0x40; + if ((machine.root_device().ioport("LINE0")->read() & 2) == 0) + { + state->m_key_irq_vector = 0x30; + } + else + { + state->m_key_irq_vector = 0xBC; + } + cputag_set_input_line(machine, "maincpu", 0, ASSERT_LINE); + break; + } + } +} + + +MACHINE_START(bk0010) +{ + machine.scheduler().timer_pulse(attotime::from_hz(2400), FUNC(keyboard_callback)); +} + +static IRQ_CALLBACK(bk0010_irq_callback) +{ + bk_state *state = device->machine().driver_data<bk_state>(); + device_set_input_line(device, 0, CLEAR_LINE); + return state->m_key_irq_vector; +} + +MACHINE_RESET( bk0010 ) +{ + bk_state *state = machine.driver_data<bk_state>(); + device_set_irq_callback(machine.device("maincpu"), bk0010_irq_callback); + + state->m_kbd_state = 0; + state->m_scrool = 01330; +} + +READ16_MEMBER(bk_state::bk_key_state_r) +{ + return m_kbd_state; +} +READ16_MEMBER(bk_state::bk_key_code_r) +{ + m_kbd_state &= ~0x80; // mark reading done + m_key_pressed = 0; + return m_key_code; +} +READ16_MEMBER(bk_state::bk_vid_scrool_r) +{ + return m_scrool; +} + +READ16_MEMBER(bk_state::bk_key_press_r) +{ + double level = (machine().device<cassette_image_device>(CASSETTE_TAG)->input()); + UINT16 cas; + if (level < 0) + { + cas = 0x00; + } + else + { + cas = 0x20; + } + + return 0x8080 | m_key_pressed | cas; +} + +WRITE16_MEMBER(bk_state::bk_key_state_w) +{ + m_kbd_state = (m_kbd_state & ~0x40) | (data & 0x40); +} + +WRITE16_MEMBER(bk_state::bk_vid_scrool_w) +{ + m_scrool = data; +} + +WRITE16_MEMBER(bk_state::bk_key_press_w) +{ +} + +READ16_MEMBER(bk_state::bk_floppy_cmd_r) +{ + return 0; +} + +WRITE16_MEMBER(bk_state::bk_floppy_cmd_w) +{ + if ((data & 1) == 1) + { + m_drive = 0; + } + if ((data & 2) == 2) + { + m_drive = 1; + } + if ((data & 4) == 4) + { + m_drive = 2; + } + if ((data & 8) == 8) + { + m_drive = 3; + } + if (data == 0) + { + m_drive = -1; + } +} + +READ16_MEMBER(bk_state::bk_floppy_data_r) +{ + return 0; +} + +WRITE16_MEMBER(bk_state::bk_floppy_data_w) +{ +} + |