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(mess) psxcd: try something a bit different (nw)

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This commit is contained in:
cracyc 2013-04-26 17:51:04 +00:00
parent 98dba96079
commit d3ebd1027d
2 changed files with 18 additions and 15 deletions
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29
src/mess/machine/psxcd.c
View File

@ -148,10 +148,11 @@ void psxcd_device::device_reset()
m_regs.sr = 0x18;
m_regs.ir = 0;
m_regs.imr = 0x1f;
sechead = 0;
sectail = 0;
m_cursec = 0;
m_mute = false;
m_dmaload = false;
m_int1 = NULL;
curpos.w = 0;
}
@ -281,14 +282,12 @@ WRITE8_MEMBER( psxcd_device::write )
case 0x03:
if((data & 0x80) && !m_dmaload)
{
if(sechead == sectail)
break;
m_dmaload = true;
memcpy(m_transbuf, secbuf[sechead], raw_sector_size);
memcpy(m_transbuf, secbuf[m_cursec], raw_sector_size);
m_regs.sr |= 0x40;
sechead++;
sechead %= sector_buffer_size;
m_cursec++;
m_cursec %= sector_buffer_size;
switch(mode & mode_size_mask)
{
@ -325,6 +324,9 @@ WRITE8_MEMBER( psxcd_device::write )
if(res_queue && !m_regs.ir)
{
command_result *res = res_queue;
if(res == m_int1)
m_int1 = NULL;
res_queue = res->next;
global_free(res);
m_regs.sr &= ~0x20;
@ -935,12 +937,13 @@ void psxcd_device::read_sector()
}
else
{
cmd_complete(prepare_result(intr_dataready));
if(!m_int1)
m_cursec = sectail;
m_int1 = prepare_result(intr_dataready);
cmd_complete(m_int1);
sectail++;
sectail %= sector_buffer_size;
if(sectail == sechead)
verboselog(machine(), 0, "psxcd: sector buffer overrun\n");
}
curpos.b[F]++;
@ -1083,7 +1086,7 @@ void psxcd_device::start_read()
send_result(intr_complete);
status |= status_reading;
sechead=sectail=0;
m_cursec=sectail=0;
unsigned int cyc=read_sector_cycles;
if (mode&mode_double_speed) cyc>>=1;
@ -1105,7 +1108,7 @@ void psxcd_device::start_play()
status|=status_playing;
sechead=sectail=0;
m_cursec=sectail=0;
if (mode&mode_autopause)
{

4
src/mess/machine/psxcd.h
View File

@ -108,10 +108,10 @@ private:
UINT8 cmdbuf[64], mode, secbuf[sector_buffer_size][raw_sector_size];
UINT8 filter_file, filter_channel, lastsechdr[8], status;
int rdp;
UINT8 sechead, sectail;
UINT8 m_cursec, sectail;
UINT16 m_transcurr;
UINT8 m_transbuf[raw_sector_size];
command_result *res_queue;
command_result *res_queue, *m_int1;
struct {
UINT8 sr, ir, imr;