Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-05-21 13:18:56 +03:00
Code Issues Actions Packages Projects Releases Wiki Activity

Haze: more Mega CD improvements

Browse Source
This commit is contained in:
Angelo Salese 2010-10-07 10:27:37 +00:00
parent a4ad950160
commit b0e060ffbd
1 changed files with 38 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
src/mame/drivers/megadriv.c
View File

@ -3798,7 +3798,7 @@ ADDRESS_MAP_END
*************************************************************************************************/
static UINT16* segacd_4meg_prgram; // pointer to SubCPU PrgRAM
static UINT16 segacd_hint_register;
static UINT16 a12000_halt_reset_reg = 0x0000;
@ -4235,6 +4235,32 @@ static WRITE16_HANDLER( segacd_main_dataram_part1_w )
}
}
static READ16_HANDLER( scd_hint_vector_r )
{
// printf("read HINT offset %d\n", offset);
switch (offset&1)
{
case 0x00:
//return 0x00ff; // doesn't make much sense..
return 0xffff;
case 0x01:
return segacd_hint_register;
}
return 0;
}
static READ16_HANDLER( scd_a12006_hint_register_r )
{
return segacd_hint_register;
}
static WRITE16_HANDLER( scd_a12006_hint_register_w )
{
COMBINE_DATA(&segacd_hint_register);
}
/* main CPU map set up in INIT */
@ -4244,6 +4270,9 @@ void segacd_init_main_cpu( running_machine* machine )
segacd_4meg_prgbank = 0;
memory_unmap_readwrite(space, 0x20000,0x3fffff,0,0);
memory_install_read_bank(space, 0x0020000, 0x003ffff, 0, 0, "scd_4m_prgbank");
memory_set_bankptr(space->machine, "scd_4m_prgbank", segacd_4meg_prgram + segacd_4meg_prgbank * 0x20000 );
memory_install_write16_handler (space, 0x0020000, 0x003ffff, 0, 0, scd_4m_prgbank_ram_w );
@ -4253,6 +4282,9 @@ void segacd_init_main_cpu( running_machine* machine )
memory_install_readwrite16_handler(cputag_get_address_space(space->machine, "maincpu", ADDRESS_SPACE_PROGRAM), 0xa12000, 0xa12001, 0, 0, scd_a12000_halt_reset_r, scd_a12000_halt_reset_w); // sub-cpu control
memory_install_readwrite16_handler(cputag_get_address_space(space->machine, "maincpu", ADDRESS_SPACE_PROGRAM), 0xa12002, 0xa12003, 0, 0, scd_a12002_memory_mode_r, scd_a12002_memory_mode_w); // memory mode / write protect
memory_install_readwrite16_handler(cputag_get_address_space(space->machine, "maincpu", ADDRESS_SPACE_PROGRAM), 0xa12006, 0xa12007, 0, 0, scd_a12006_hint_register_r, scd_a12006_hint_register_w); // where HINT points on main CPU
memory_install_readwrite16_handler(cputag_get_address_space(space->machine, "maincpu", ADDRESS_SPACE_PROGRAM), 0xa1200e, 0xa1200f, 0, 0, segacd_comms_flags_r, segacd_comms_flags_maincpu_w); // communication flags block
memory_install_readwrite16_handler(cputag_get_address_space(space->machine, "maincpu", ADDRESS_SPACE_PROGRAM), 0xa12010, 0xa1201f, 0, 0, segacd_comms_main_part1_r, segacd_comms_main_part1_w);
@ -4261,12 +4293,17 @@ void segacd_init_main_cpu( running_machine* machine )
cpu_set_irq_callback(machine->device("segacd_68k"), segacd_sub_int_callback);
memory_install_read16_handler (space, 0x0000070, 0x0000073, 0, 0, scd_hint_vector_r );
}
static MACHINE_RESET( segacd )
{
cpu_set_input_line(_segacd_68k_cpu, INPUT_LINE_RESET, ASSERT_LINE);
cpu_set_input_line(_segacd_68k_cpu, INPUT_LINE_HALT, ASSERT_LINE);
segacd_hint_register = 0xffff; // -1
}