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vidbrain.c
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vidbrain.c
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/***************************************************************************
VideoBrain FamilyComputer
http://www.atariprotos.com/othersystems/videobrain/videobrain.htm
http://www.seanriddle.com/vbinfo.html
http://www.seanriddle.com/videobrain.html
http://www.google.com/patents/US4232374
http://www.google.com/patents/US4177462
07/04/2009 Skeleton driver.
****************************************************************************/
/*
TODO:
- video interrupts
- R-2R ladder DAC
- reset on cartridge unload
- use machine/f3853.h
- joystick scan timer 555
- expander 1 (cassette, RS-232)
- expander 2 (modem)
*/
#include "includes/vidbrain.h"
//**************************************************************************
// READ/WRITE HANDLERS
//**************************************************************************
//-------------------------------------------------
// keyboard_w - keyboard column write
//-------------------------------------------------
WRITE8_MEMBER( vidbrain_state::keyboard_w )
{
/*
bit description
0 keyboard column 0, sound data 0
1 keyboard column 1, sound data 1
2 keyboard column 2
3 keyboard column 3
4 keyboard column 4
5 keyboard column 5
6 keyboard column 6
7 keyboard column 7
*/
m_keylatch = data;
}
//-------------------------------------------------
// keyboard_r - keyboard row read
//-------------------------------------------------
READ8_MEMBER( vidbrain_state::keyboard_r )
{
/*
bit description
0 keyboard row 0, joystick 1 fire
1 keyboard row 1, joystick 2 fire
2 keyboard row 2, joystick 3 fire
3 keyboard row 3, joystick 4 fire
4
5
6
7
*/
UINT8 data = ioport("JOY-R")->read();
if (BIT(m_keylatch, 0)) data |= ioport("IO00")->read();
if (BIT(m_keylatch, 1)) data |= ioport("IO01")->read();
if (BIT(m_keylatch, 2)) data |= ioport("IO02")->read();
if (BIT(m_keylatch, 3)) data |= ioport("IO03")->read();
if (BIT(m_keylatch, 4)) data |= ioport("IO04")->read();
if (BIT(m_keylatch, 5)) data |= ioport("IO05")->read();
if (BIT(m_keylatch, 6)) data |= ioport("IO06")->read();
if (BIT(m_keylatch, 7)) data |= ioport("IO07")->read();
if (!m_uv->kbd_r()) data |= ioport("UV201-31")->read();
return data;
}
//-------------------------------------------------
// sound_w - sound clock write
//-------------------------------------------------
WRITE8_MEMBER( vidbrain_state::sound_w )
{
/*
bit description
0
1
2
3
4 sound clock
5 accessory jack pin 5
6 accessory jack pin 1
7 joystick enable
*/
// sound clock
int sound_clk = BIT(data, 4);
if (!m_sound_clk && sound_clk)
{
discrete_sound_w(m_discrete, NODE_01, m_keylatch & 0x03);
}
m_sound_clk = sound_clk;
// joystick enable
m_joy_enable = BIT(data, 7);
if (m_joy_enable)
{
// TODO calculate NE555 firing time based on input port values
//timer_set(attotime::from_msec(t), TIMER_JOYSTICK);
}
}
//-------------------------------------------------
// interrupt_check - check interrupts
//-------------------------------------------------
void vidbrain_state::interrupt_check()
{
int interrupt = CLEAR_LINE;
switch (m_int_enable)
{
case 1:
if (m_ext_int_latch) interrupt = ASSERT_LINE;
break;
case 3:
if (m_timer_int_latch) interrupt = ASSERT_LINE;
break;
}
m_maincpu->set_input_line(F8_INPUT_LINE_INT_REQ, interrupt);
}
//-------------------------------------------------
// f3853_w - F3853 SMI write
//-------------------------------------------------
WRITE8_MEMBER( vidbrain_state::f3853_w )
{
switch (offset)
{
case 0:
// interrupt vector address high
m_vector = (data << 8) | (m_vector & 0xff);
logerror("%s: F3853 Interrupt Vector %04x\n", machine().describe_context(), m_vector);
break;
case 1:
// interrupt vector address low
m_vector = (m_vector & 0xff00) | data;
logerror("%s: F3853 Interrupt Vector %04x\n", machine().describe_context(), m_vector);
break;
case 2:
// interrupt control
m_int_enable = data & 0x03;
logerror("%s: F3853 Interrupt Control %u\n", machine().describe_context(), m_int_enable);
interrupt_check();
if (m_int_enable == 0x03) fatalerror("F3853 Timer not supported!");
break;
case 3:
// timer 8-bit polynomial counter
fatalerror("%s: F3853 Timer not supported!", machine().describe_context());
break;
}
}
//**************************************************************************
// ADDRESS MAPS
//**************************************************************************
//-------------------------------------------------
// ADDRESS_MAP( vidbrain_mem )
//-------------------------------------------------
static ADDRESS_MAP_START( vidbrain_mem, AS_PROGRAM, 8, vidbrain_state )
AM_RANGE(0x0000, 0x07ff) AM_MIRROR(0xc000) AM_ROM
AM_RANGE(0x0800, 0x08ff) AM_MIRROR(0x0300) AM_DEVREADWRITE(UV201_TAG, uv201_device, read, write)
AM_RANGE(0x0c00, 0x0fff) AM_MIRROR(0xe000) AM_RAM
AM_RANGE(0x1000, 0x1fff) AM_MIRROR(0xe000) AM_ROM
AM_RANGE(0x2000, 0x27ff) AM_MIRROR(0xc000) AM_ROM
ADDRESS_MAP_END
//-------------------------------------------------
// ADDRESS_MAP( vidbrain_io )
//-------------------------------------------------
static ADDRESS_MAP_START( vidbrain_io, AS_IO, 8, vidbrain_state )
AM_RANGE(0x00, 0x00) AM_WRITE(keyboard_w)
AM_RANGE(0x01, 0x01) AM_READWRITE(keyboard_r, sound_w)
AM_RANGE(0x0c, 0x0f) AM_WRITE(f3853_w)
// AM_RANGE(0x0c, 0x0f) AM_DEVREADWRITE_LEGACY(F3853_TAG, f3853_r, f3853_w)
ADDRESS_MAP_END
//**************************************************************************
// INPUT PORTS
//**************************************************************************
//-------------------------------------------------
// INPUT_CHANGED( trigger_reset )
//-------------------------------------------------
INPUT_CHANGED_MEMBER( vidbrain_state::trigger_reset )
{
m_maincpu->set_input_line(INPUT_LINE_RESET, newval ? CLEAR_LINE : ASSERT_LINE);
}
//-------------------------------------------------
// INPUT_PORTS( vidbrain )
//-------------------------------------------------
static INPUT_PORTS_START( vidbrain )
PORT_START("IO00")
PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_I) PORT_CHAR('I') PORT_CHAR('"')
PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_O) PORT_CHAR('O') PORT_CHAR('#')
PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("P \xC2\xA2") PORT_CODE(KEYCODE_P) PORT_CHAR('P') PORT_CHAR(0x00a2)
PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("; \xC2\xB6") PORT_CODE(KEYCODE_COLON) PORT_CHAR(';') PORT_CHAR(0x00b6)
PORT_START("IO01")
PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_U) PORT_CHAR('U') PORT_CHAR('!')
PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_K) PORT_CHAR('K') PORT_CHAR(')')
PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_L) PORT_CHAR('L') PORT_CHAR('$')
PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_COMMA) PORT_CHAR('\'') PORT_CHAR('*')
PORT_START("IO02")
PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("Y \xC3\xB7") PORT_CODE(KEYCODE_Y) PORT_CHAR('Y') PORT_CHAR(0x00f7)
PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_J) PORT_CHAR('J') PORT_CHAR('(')
PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_M) PORT_CHAR('M') PORT_CHAR(':')
PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("SHIFT") PORT_CODE(KEYCODE_RSHIFT) PORT_CHAR(UCHAR_SHIFT_1)
PORT_START("IO03")
PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("T \xC3\x97") PORT_CODE(KEYCODE_T) PORT_CHAR('T') PORT_CHAR(0x00d7)
PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_H) PORT_CHAR('H') PORT_CHAR('/')
PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_N) PORT_CHAR('N') PORT_CHAR(',')
PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("ERASE RESTART") PORT_CODE(KEYCODE_BACKSPACE) PORT_CHAR(8)
PORT_START("IO04")
PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_R) PORT_CHAR('R') PORT_CHAR('9')
PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_G) PORT_CHAR('G') PORT_CHAR('-')
PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_B) PORT_CHAR('B') PORT_CHAR('=')
PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("SPACE RUN/STOP") PORT_CODE(KEYCODE_SPACE) PORT_CHAR(' ')
PORT_START("IO05")
PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_E) PORT_CHAR('E') PORT_CHAR('8')
PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_F) PORT_CHAR('F') PORT_CHAR('6')
PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_V) PORT_CHAR('V') PORT_CHAR('+')
PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("SPECIAL ALARM") PORT_CODE(KEYCODE_F4)
PORT_START("IO06")
PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_W) PORT_CHAR('W') PORT_CHAR('7')
PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_D) PORT_CHAR('D') PORT_CHAR('5')
PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_C) PORT_CHAR('C') PORT_CHAR('3')
PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("NEXT CLOCK") PORT_CODE(KEYCODE_F3)
PORT_START("IO07")
PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_Q) PORT_CHAR('Q') PORT_CHAR('%')
PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_S) PORT_CHAR('S') PORT_CHAR('4')
PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_X) PORT_CHAR('X') PORT_CHAR('2')
PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("PREVIOUS COLOR") PORT_CODE(KEYCODE_F2)
PORT_START("UV201-31")
PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_A) PORT_CHAR('A') PORT_CHAR('.')
PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_Z) PORT_CHAR('Z') PORT_CHAR('1')
PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_SLASH) PORT_CHAR('?') PORT_CHAR('0')
PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("BACK TEXT") PORT_CODE(KEYCODE_F1)
PORT_START("RESET")
PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("MASTER CONTROL") PORT_CODE(KEYCODE_F5) PORT_CHAR(UCHAR_MAMEKEY(F5)) PORT_CHANGED_MEMBER(DEVICE_SELF, vidbrain_state, trigger_reset, 0)
PORT_START("JOY1-X")
PORT_BIT( 0xff, 0x80, IPT_AD_STICK_X ) PORT_SENSITIVITY(25) PORT_PLAYER(1)
PORT_START("JOY1-Y")
PORT_BIT( 0xff, 0x80, IPT_AD_STICK_Y ) PORT_SENSITIVITY(25) PORT_PLAYER(1)
PORT_START("JOY2-X")
PORT_BIT( 0xff, 0x80, IPT_AD_STICK_X ) PORT_SENSITIVITY(25) PORT_PLAYER(2)
PORT_START("JOY2-Y")
PORT_BIT( 0xff, 0x80, IPT_AD_STICK_Y ) PORT_SENSITIVITY(25) PORT_PLAYER(2)
PORT_START("JOY3-X")
PORT_BIT( 0xff, 0x80, IPT_AD_STICK_X ) PORT_SENSITIVITY(25) PORT_PLAYER(3)
PORT_START("JOY3-Y")
PORT_BIT( 0xff, 0x80, IPT_AD_STICK_Y ) PORT_SENSITIVITY(25) PORT_PLAYER(3)
PORT_START("JOY4-X")
PORT_BIT( 0xff, 0x80, IPT_AD_STICK_X ) PORT_SENSITIVITY(25) PORT_PLAYER(4)
PORT_START("JOY4-Y")
PORT_BIT( 0xff, 0x80, IPT_AD_STICK_Y ) PORT_SENSITIVITY(25) PORT_PLAYER(4)
PORT_START("JOY-R")
PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_PLAYER(1)
PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_PLAYER(2)
PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_PLAYER(3)
PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_PLAYER(4)
INPUT_PORTS_END
//**************************************************************************
// SOUND
//**************************************************************************
//-------------------------------------------------
// DISCRETE_SOUND( vidbrain )
//-------------------------------------------------
static const discrete_dac_r1_ladder vidbrain_dac =
{
2,
{ RES_K(120), RES_K(120) }, // R=56K, 2R=120K
0, 0, RES_K(120), 0
};
static DISCRETE_SOUND_START( vidbrain )
DISCRETE_INPUT_DATA(NODE_01)
DISCRETE_DAC_R1(NODE_02, NODE_01, DEFAULT_TTL_V_LOGIC_1, &vidbrain_dac)
DISCRETE_OUTPUT(NODE_02, 5000)
DISCRETE_SOUND_END
//**************************************************************************
// DEVICE CONFIGURATION
//**************************************************************************
//-------------------------------------------------
// f3853_interface smi_intf
//-------------------------------------------------
static void f3853_int_req_w(device_t *device, UINT16 addr, int level)
{
vidbrain_state *state = device->machine().driver_data<vidbrain_state>();
state->m_vector = addr;
state->m_maincpu->set_input_line(F8_INPUT_LINE_INT_REQ, level);
}
static const f3853_interface smi_intf =
{
f3853_int_req_w
};
//-------------------------------------------------
// UV201_INTERFACE( uv_intf )
//-------------------------------------------------
WRITE_LINE_MEMBER( vidbrain_state::ext_int_w )
{
if (state)
{
m_ext_int_latch = state;
interrupt_check();
}
}
static UINT8 memory_read_byte(address_space *space, offs_t address) { return space->read_byte(address); }
static UV201_INTERFACE( uv_intf )
{
SCREEN_TAG,
DEVCB_DRIVER_LINE_MEMBER(vidbrain_state, ext_int_w),
DEVCB_MEMORY_HANDLER(F3850_TAG, PROGRAM, memory_read_byte)
};
//**************************************************************************
// MACHINE INITIALIZATION
//**************************************************************************
//-------------------------------------------------
// IRQ_CALLBACK( vidbrain_int_ack )
//-------------------------------------------------
static IRQ_CALLBACK( vidbrain_int_ack )
{
vidbrain_state *state = device->machine().driver_data<vidbrain_state>();
UINT16 vector = state->m_vector;
switch (state->m_int_enable)
{
case 1:
vector |= 0x80;
state->m_ext_int_latch = 0;
break;
case 3:
vector &= ~0x80;
state->m_timer_int_latch = 0;
break;
}
state->interrupt_check();
return vector;
}
//-------------------------------------------------
// device_timer - handler timer events
//-------------------------------------------------
void vidbrain_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
m_uv->ext_int_w(0);
}
//-------------------------------------------------
// MACHINE_START( vidbrain )
//-------------------------------------------------
void vidbrain_state::machine_start()
{
// register IRQ callback
device_set_irq_callback(m_maincpu, vidbrain_int_ack);
// register for state saving
save_item(NAME(m_vector));
save_item(NAME(m_int_enable));
save_item(NAME(m_ext_int_latch));
save_item(NAME(m_timer_int_latch));
save_item(NAME(m_keylatch));
save_item(NAME(m_joy_enable));
save_item(NAME(m_sound_clk));
}
//-------------------------------------------------
// MACHINE_RESET( vidbrain )
//-------------------------------------------------
void vidbrain_state::machine_reset()
{
m_int_enable = 0;
m_ext_int_latch = 0;
m_timer_int_latch = 0;
}
//**************************************************************************
// MACHINE CONFIGURATION
//**************************************************************************
//-------------------------------------------------
// MACHINE_CONFIG( vidbrain )
//-------------------------------------------------
static MACHINE_CONFIG_START( vidbrain, vidbrain_state )
// basic machine hardware
MCFG_CPU_ADD(F3850_TAG, F8, XTAL_14_31818MHz/8)
MCFG_CPU_PROGRAM_MAP(vidbrain_mem)
MCFG_CPU_IO_MAP(vidbrain_io)
// video hardware
MCFG_UV201_ADD(UV201_TAG, SCREEN_TAG, XTAL_14_31818MHz, uv_intf)
// sound hardware
MCFG_SPEAKER_STANDARD_MONO("mono")
MCFG_SOUND_ADD(DISCRETE_TAG, DISCRETE, 0)
MCFG_SOUND_CONFIG_DISCRETE(vidbrain)
MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.80)
// devices
MCFG_F3853_ADD(F3853_TAG, XTAL_14_31818MHz/8, smi_intf)
// cartridge
MCFG_CARTSLOT_ADD("cart")
MCFG_CARTSLOT_EXTENSION_LIST("bin")
MCFG_CARTSLOT_INTERFACE("vidbrain_cart")
// software lists
MCFG_SOFTWARE_LIST_ADD("cart_list", "vidbrain")
// internal ram
MCFG_RAM_ADD(RAM_TAG)
MCFG_RAM_DEFAULT_SIZE("1K")
MACHINE_CONFIG_END
//**************************************************************************
// ROMS
//**************************************************************************
//-------------------------------------------------
// ROM( vidbrain )
//-------------------------------------------------
ROM_START( vidbrain )
ROM_REGION( 0x3000, F3850_TAG, 0 )
ROM_LOAD( "uvres 1n.d67", 0x0000, 0x0800, CRC(065fe7c2) SHA1(9776f9b18cd4d7142e58eff45ac5ee4bc1fa5a2a) )
ROM_CART_LOAD( "cart", 0x1000, 0x1000, 0 )
ROM_LOAD( "resn2.e5", 0x2000, 0x0800, CRC(1d85d7be) SHA1(26c5a25d1289dedf107fa43aa8dfc14692fd9ee6) )
ROM_END
//**************************************************************************
// SYSTEM DRIVERS
//**************************************************************************
// YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME FLAGS
COMP( 1977, vidbrain, 0, 0, vidbrain, vidbrain, 0, "VideoBrain Computer Company", "VideoBrain FamilyComputer", GAME_NOT_WORKING | GAME_IMPERFECT_SOUND )