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Added preliminary CD-DA routing to SCSP EXTS parallel port, fixes CD-Rom player equalizer in Sega Saturn. [Angelo Salese]

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This commit is contained in:
angelosa 2015-07-21 23:50:51 +02:00
parent 59fd99be9b
commit 4472d60b15
2 changed files with 14 additions and 6 deletions
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7
src/emu/machine/stvcd.c
View File

@ -862,7 +862,11 @@ void saturn_state::cd_exec_command( void )
//printf("Partition %08x %04x\n",bufnum,cr4);
}
hirqreg |= (CMOK|DRDY);
printf("%04x\n",cr4);
if(cr4 == 0)
hirqreg |= (CMOK);
else
hirqreg |= (CMOK|DRDY);
status_type = 1;
}
break;
@ -1908,6 +1912,7 @@ void saturn_state::cd_writeWord(UINT32 addr, UINT16 data)
cr1 = data;
cd_stat &= ~CD_STAT_PERI;
cmd_pending |= 1;
sh1_timer->adjust(attotime::never);
break;
case 0x001c:
case 0x001e:

13
src/emu/sound/scsp.c
View File

@ -30,6 +30,7 @@
*/
#include "emu.h"
#include "sound/cdda.h"
#include "scsp.h"
@ -1010,8 +1011,10 @@ unsigned short scsp_device::r16(address_space &space, unsigned int addr)
v= *((unsigned short *) (m_DSP.EFREG+(addr-0xec0)/2));
else
{
/*
TODO: Kyuutenkai reads from 0xee0/0xee2, it's an undocumented "DSP internal buffer" register ...
/**!
@todo Kyuutenkai reads from 0xee0/0xee2, it's tied with EXTS register(s) also used for CD-Rom Player equalizer.
This port is actually an external parallel port, directly connected from the CD Block device, hence code is a bit of an hack.
Kyuutenkai code snippet for reference:
004A3A: 207C 0010 0EE0 movea.l #$100ee0, A0
004A40: 43EA 0090 lea ($90,A2), A1 ;A2=0x700
004A44: 6100 0254 bsr $4c9a
@ -1044,11 +1047,11 @@ unsigned short scsp_device::r16(address_space &space, unsigned int addr)
004CB0: 4CDF 0002 movem.l (A7)+, D1
004CB4: 4E75 rts
*/
logerror("SCSP: Reading from unmapped register %08x\n",addr);
logerror("SCSP: Reading from EXTS register %08x\n",addr);
if(addr == 0xee0)
v= m_DSP.TEMP[0] >> 16;
v = space.machine().device<cdda_device>("cdda")->get_channel_volume(0);
if(addr == 0xee2)
v= m_DSP.TEMP[0] & 0xffff;
v = space.machine().device<cdda_device>("cdda")->get_channel_volume(1);
}
}
return v;