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cheap hacks, but gets some stuff to boot (nw)

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This commit is contained in:
David Haywood 2013-08-12 04:45:15 +00:00
parent 559f6d0fd0
commit bfb8e2274a
1 changed files with 39 additions and 13 deletions
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52
src/mess/drivers/segapico.c
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@ -2,7 +2,16 @@
/****************************************** PICO emulation ****************************************/ /****************************************** PICO emulation ****************************************/
/* todo, make this more independent of the Genesis emulation, it's really only the same CPU + VDP /* todo, make this more independent of the Genesis emulation, it's really only the same CPU + VDP
and doesn't need to be connected to the Genesis at all. */ and doesn't need to be connected to the Genesis at all.
sound is the 315-5641 / D77591, should be compatible with the 7759? but probably wants us to maintain
an external buffer of at least 0x40 bytes and feed it on a timer in sync with the timer in the chip?
currently no way to select (or display) the story book area of the games? (will require layout and
external artwork)
*/
/* /*
@ -229,16 +238,30 @@ READ16_MEMBER(pico_base_state::pico_68k_io_read )
retdata = m_page_register; retdata = m_page_register;
break; break;
} }
case 7:
case 8: // toy story 2 checks this for 0x3f (is that 'empty'?)
/* Returns free bytes left in the PCM FIFO buffer */ /* Returns free bytes left in the PCM FIFO buffer */
retdata = 0x00; retdata = 0x3f;
break; break;
case 8: case 9:
/* /*
For reads, if bit 15 is cleared, it means PCM is 'busy' or For reads, if bit 15 is cleared, it means PCM is 'busy' or
something like that, as games sometimes wait for it to become 1. something like that, as games sometimes wait for it to become 1.
*/ */
retdata = 0x00; return (m_upd7759->busy_r()^1) << 15;
case 7:
case 10:
case 11:
case 12:
case 13:
case 14:
case 15:
logerror("pico_68k_io_read %d\n", offset);
} }
return retdata | retdata << 8; return retdata | retdata << 8;
@ -247,10 +270,10 @@ READ16_MEMBER(pico_base_state::pico_68k_io_read )
static void sound_cause_irq( device_t *device, int chip ) static void sound_cause_irq( device_t *device, int chip )
{ {
// pico_base_state *state = device->machine().driver_data<pico_base_state>(); pico_base_state *state = device->machine().driver_data<pico_base_state>();
printf("sound irq\n"); // printf("sound irq\n");
/* upd7759 callback */ /* upd7759 callback */
// state->m_soundcpu->set_input_line(INPUT_LINE_NMI, PULSE_LINE); state->m_maincpu->set_input_line(3, HOLD_LINE);
} }
@ -262,11 +285,17 @@ const upd775x_interface pico_upd7759_interface =
WRITE16_MEMBER(pico_base_state::pico_68k_io_write ) WRITE16_MEMBER(pico_base_state::pico_68k_io_write )
{ {
printf("pico_68k_io_write %04x %04x %04x\n", offset*2, data, mem_mask); // printf("pico_68k_io_write %04x %04x %04x\n", offset*2, data, mem_mask);
switch (offset) switch (offset)
{ {
case 0x12/2: // guess case 0x12/2: // guess
m_upd7759->reset_w(0);
m_upd7759->start_w(0);
m_upd7759->reset_w(1);
m_upd7759->start_w(1);
if (mem_mask&0x00ff) m_upd7759->port_w(space,0,data&0xff); if (mem_mask&0x00ff) m_upd7759->port_w(space,0,data&0xff);
if (mem_mask&0xff00) m_upd7759->port_w(space,0,(data>>8)&0xff); if (mem_mask&0xff00) m_upd7759->port_w(space,0,(data>>8)&0xff);
@ -323,10 +352,7 @@ MACHINE_START_MEMBER(pico_state,pico)
m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0xa15000, 0xa150ff, read16_delegate(FUNC(base_md_cart_slot_device::read_a15),(base_md_cart_slot_device*)m_picocart), write16_delegate(FUNC(base_md_cart_slot_device::write_a15),(base_md_cart_slot_device*)m_picocart)); m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0xa15000, 0xa150ff, read16_delegate(FUNC(base_md_cart_slot_device::read_a15),(base_md_cart_slot_device*)m_picocart), write16_delegate(FUNC(base_md_cart_slot_device::write_a15),(base_md_cart_slot_device*)m_picocart));
m_maincpu->space(AS_PROGRAM).install_write_handler(0xa14000, 0xa14003, write16_delegate(FUNC(base_md_cart_slot_device::write_tmss_bank),(base_md_cart_slot_device*)m_picocart)); m_maincpu->space(AS_PROGRAM).install_write_handler(0xa14000, 0xa14003, write16_delegate(FUNC(base_md_cart_slot_device::write_tmss_bank),(base_md_cart_slot_device*)m_picocart));
m_upd7759->reset_w(0);
m_upd7759->start_w(0);
m_upd7759->reset_w(1);
m_upd7759->start_w(1);
} }
static MACHINE_CONFIG_START( pico, pico_state ) static MACHINE_CONFIG_START( pico, pico_state )