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added NEW2 bit

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This commit is contained in:
Michaël Banaan Ananas 2011-08-06 22:19:59 +00:00
parent 555630efff
commit 2d165ef98c
1 changed files with 39 additions and 4 deletions
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43
src/emu/sound/ymf278b.c
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@ -109,6 +109,7 @@ typedef struct
UINT8 busy;
emu_timer *timer_busy;
UINT8 exp;
INT32 fm_l, fm_r;
INT32 pcm_l, pcm_r;
@ -405,17 +406,21 @@ static void ymf278b_A_w(running_machine &machine, YMF278BChip *chip, UINT8 reg,
{
switch(reg)
{
case 0x00: // TEST
// LSI TEST
case 0x00:
case 0x01:
break;
case 0x02:
chip->timer_a_count = data;
ymf278b_timer_a_reset(chip);
break;
case 0x03:
chip->timer_b_count = data;
ymf278b_timer_b_reset(chip);
break;
case 0x04:
if(data & 0x80)
chip->current_irq = 0;
@ -431,14 +436,31 @@ static void ymf278b_A_w(running_machine &machine, YMF278BChip *chip, UINT8 reg,
}
ymf278b_irq_check(machine, chip);
break;
default:
logerror("YMF278B: Port A write %02x, %02x\n", reg, data);
break;
}
}
static void ymf278b_B_w(YMF278BChip *chip, UINT8 reg, UINT8 data)
{
logerror("YMF278B: Port B write %02x, %02x\n", reg, data);
switch(reg)
{
// LSI TEST
case 0x00:
case 0x01:
break;
// expansion register (NEW2/NEW)
case 0x05:
chip->exp = data;
break;
default:
logerror("YMF278B: Port B write %02x, %02x\n", reg, data);
break;
}
}
static TIMER_CALLBACK( ymf278b_timer_busy_clear )
@ -487,6 +509,9 @@ static void ymf278b_C_w(YMF278BChip *chip, UINT8 reg, UINT8 data)
case 0x80:
slot->bits = 16;
break;
case 0xc0:
// prohibited
break;
}
slot->lfo = (p[7] >> 2) & 7;
@ -587,7 +612,8 @@ static void ymf278b_C_w(YMF278BChip *chip, UINT8 reg, UINT8 data)
// All non-slot registers
switch (reg)
{
case 0x00: // TEST
// LSI TEST
case 0x00:
case 0x01:
break;
@ -634,8 +660,16 @@ READ8_DEVICE_HANDLER( ymf278b_r )
switch (offset)
{
// status register
case 0:
return chip->busy | chip->current_irq | (chip->irq_line == ASSERT_LINE ? 0x80 : 0x00);
{
// bits 0 and 1 are only valid if NEW2 is set
UINT8 newbits = 0;
if (chip->exp & 2)
newbits = chip->busy;
return chip->current_irq | (chip->irq_line == ASSERT_LINE ? 0x80 : 0x00);
}
default:
logerror("%s: unexpected read at offset %X from ymf278b\n", device->machine().describe_context(), offset);
@ -705,6 +739,7 @@ static void ymf278b_register_save_state(device_t *device, YMF278BChip *chip)
device->save_item(NAME(chip->memmode));
device->save_item(NAME(chip->memadr));
device->save_item(NAME(chip->busy));
device->save_item(NAME(chip->exp));
device->save_item(NAME(chip->fm_l));
device->save_item(NAME(chip->fm_r));
device->save_item(NAME(chip->pcm_l));