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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 ****************************************/
/* 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;
break;
}
case 7:
case 8: // toy story 2 checks this for 0x3f (is that 'empty'?)
/* Returns free bytes left in the PCM FIFO buffer */
retdata = 0x00;
retdata = 0x3f;
break;
case 8:
case 9:
/*
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.
*/
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;
@ -247,10 +270,10 @@ READ16_MEMBER(pico_base_state::pico_68k_io_read )
static void sound_cause_irq( device_t *device, int chip )
{
// pico_base_state *state = device->machine().driver_data<pico_base_state>();
printf("sound irq\n");
pico_base_state *state = device->machine().driver_data<pico_base_state>();
// printf("sound irq\n");
/* 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 )
{
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)
{
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&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_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 )