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Another Mega CD fix from Haze

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This commit is contained in:
Angelo Salese 2011-03-09 01:24:14 +00:00
parent ad13dfa233
commit 6a1371290f
1 changed files with 39 additions and 14 deletions
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53
src/mame/machine/megadriv.c
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@ -4529,6 +4529,13 @@ void CDC_Do_DMA(running_machine* machine, int rate)
{
dest[dstoffset+1] = data >>8;
dest[dstoffset+0] = data&0xff;
if (destination==DMA_WRAM)
{
if (segacd_ram_mode==RAM_MODE_2MEG)
segacd_mark_tiles_dirty(space->machine, dstoffset/2);
}
}
}
@ -4824,8 +4831,6 @@ static READ16_HANDLER( scd_a12000_halt_reset_r )
// so probably don't change instantly...
//
static TIMER_CALLBACK( segacd_dmna_ret_timer_callback )
{
@ -4858,8 +4863,6 @@ static TIMER_CALLBACK( segacd_dmna_ret_timer_callback )
}
static READ16_HANDLER( scd_a12002_memory_mode_r )
{
space->machine->scheduler().synchronize();
@ -4893,9 +4896,13 @@ static WRITE8_HANDLER( scd_a12002_memory_mode_w_8_15 )
segacd_ram_writeprotect_bits = data;
}
static WRITE8_HANDLER( scd_a12002_memory_mode_w_0_7 )
{
segacd_4meg_prgbank = (data&0x00c0)>>6;
#if 1
//if (data&0x0001) printf("ret bit set (invalid? can't set from main68k?)\n");
if (data&0x0002)
{
@ -4923,8 +4930,8 @@ static WRITE8_HANDLER( scd_a12002_memory_mode_w_0_7 )
printf("dmna bit in mode 1\n");
}
}
#endif
segacd_4meg_prgbank = (data&0x00c0)>>6;
}
@ -4939,7 +4946,10 @@ static WRITE16_HANDLER( scd_a12002_memory_mode_w )
scd_a12002_memory_mode_w_0_7(space, 0, data&0xff);
}
// can't read the bank?
static READ16_HANDLER( segacd_sub_memory_mode_r )
{
space->machine->scheduler().synchronize();
@ -4958,11 +4968,12 @@ WRITE8_HANDLER( segacd_sub_memory_mode_w_8_15 )
/* setting write protect bits from sub-cpu has no effect? */
}
WRITE8_HANDLER( segacd_sub_memory_mode_w_0_7 )
{
segacd_memory_priority_mode = (data&0x0018)>>3;
#if 1
if (data&0x0001)
{
//printf("ret bit set\n");
@ -5034,7 +5045,7 @@ WRITE8_HANDLER( segacd_sub_memory_mode_w_0_7 )
}
}
}
#endif
}
@ -5940,6 +5951,19 @@ void segacd_init_main_cpu( running_machine* machine )
}
static timer_device* scd_dma_timer;
static TIMER_DEVICE_CALLBACK( scd_dma_timer_callback )
{
// todo: accurate timing of this!
#define RATE 256
if (sega_cd_connected)
CDC_Do_DMA(timer.machine, RATE);
scd_dma_timer->adjust(attotime::from_hz(megadriv_framerate) / megadrive_total_scanlines);
}
static MACHINE_RESET( segacd )
{
@ -5982,6 +6006,8 @@ static MACHINE_RESET( segacd )
hock_cmd = 0;
stopwatch_timer = machine->device<timer_device>("sw_timer");
scd_dma_timer->adjust(attotime::zero);
}
@ -6076,7 +6102,7 @@ static READ16_HANDLER( segacd_sub_dataram_part2_r )
{
if (segacd_ram_mode==RAM_MODE_2MEG)
{
printf("ILLEGAL segacd_sub_dataram_part2_r in mode 0\n"); // not mapepd to anything in mode 0
printf("ILLEGAL segacd_sub_dataram_part2_r in mode 0\n"); // not mapped to anything in mode 0
return 0x0000;
}
else if (segacd_ram_mode==RAM_MODE_1MEG)
@ -8957,11 +8983,6 @@ static TIMER_DEVICE_CALLBACK( render_timer_callback )
if (genesis_scanline_counter>=0 && genesis_scanline_counter<megadrive_visible_scanlines)
{
genesis_render_scanline(timer.machine, genesis_scanline_counter);
// put this one a timer instead?
#define RATE 256
if (sega_cd_connected)
CDC_Do_DMA(timer.machine, RATE);
}
}
@ -9608,7 +9629,6 @@ MACHINE_CONFIG_DERIVED( genesis_32x_pal, megadpal )
MACHINE_CONFIG_END
MACHINE_CONFIG_DERIVED( genesis_scd, megadriv )
MCFG_CPU_ADD("segacd_68k", M68000, SEGACD_CLOCK ) /* 12.5 MHz */
@ -9626,6 +9646,9 @@ MACHINE_CONFIG_DERIVED( genesis_scd, megadriv )
MCFG_SOUND_ROUTE( 0, "lspeaker", 0.50 )
MCFG_SOUND_ROUTE( 1, "rspeaker", 0.50 )
MCFG_TIMER_ADD("scd_dma_timer", scd_dma_timer_callback)
//MCFG_QUANTUM_PERFECT_CPU("maincpu")
MACHINE_CONFIG_END
@ -9736,6 +9759,8 @@ static void megadriv_init_common(running_machine *machine)
printf("Sega CD secondary 68k cpu found '%s'\n", _segacd_68k_cpu->tag() );
sega_cd_connected = 1;
segacd_init_main_cpu(machine);
scd_dma_timer = machine->device<timer_device>("scd_dma_timer");
}
_svp_cpu = machine->device<cpu_device>("svp");