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(minor cleanup)

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This commit is contained in:
Michaël Banaan Ananas 2011-08-09 17:00:31 +00:00
parent 1eb8fec2f5
commit c50a7b1fab
1 changed files with 9 additions and 8 deletions
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17
src/emu/sound/ymf278b.c
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@ -162,7 +162,7 @@ INLINE UINT8 ymf278b_read_memory(YMF278BChip *chip, UINT32 offset)
if (offset >= chip->romsize)
{
// logerror("YMF278B: Memory read overflow %x\n", offset);
return 0;
return 0xff;
}
return chip->rom[offset];
}
@ -231,7 +231,7 @@ static UINT32 ymf278_compute_decay_env_vol_step(YMF278BSlot *slot, int val)
// rate override with damping/pseudo reverb
if (slot->DAMP)
rate = 56;
rate = 56; // datasheet says it's slightly curved though
else if (slot->PRVB && slot->env_vol > ((6*8)<<23))
{
// pseudo reverb starts at -18dB (6 in voltab)
@ -273,8 +273,8 @@ static void ymf278b_compute_envelope(YMF278BSlot *slot)
if (rate==63)
{
// immediate
LOG(("YMF278B: Attack skipped - "));
slot->env_vol = 0;
slot->env_vol_lim = 256U<<23;
slot->env_step++;
// ..fall through
}
@ -764,7 +764,7 @@ static TIMER_CALLBACK( ymf278b_timer_busy_clear )
chip->status_busy = 0;
}
static void ymf278b_timer_busy_reset(YMF278BChip *chip, int is_pcm)
static void ymf278b_timer_busy_start(YMF278BChip *chip, int is_pcm)
{
// status register BUSY bit is on for 56(FM) or 88(PCM) cycles
chip->status_busy = 1;
@ -779,25 +779,25 @@ WRITE8_DEVICE_HANDLER( ymf278b_w )
{
case 0:
case 2:
ymf278b_timer_busy_reset(chip, 0);
ymf278b_timer_busy_start(chip, 0);
chip->port_AB = data;
chip->lastport = offset>>1 & 1;
break;
case 1:
case 3:
ymf278b_timer_busy_reset(chip, 0);
ymf278b_timer_busy_start(chip, 0);
if (chip->lastport) ymf278b_B_w(chip, chip->port_AB, data);
else ymf278b_A_w(device->machine(), chip, chip->port_AB, data);
break;
case 4:
ymf278b_timer_busy_reset(chip, 1);
ymf278b_timer_busy_start(chip, 1);
chip->port_C = data;
break;
case 5:
ymf278b_timer_busy_reset(chip, 1);
ymf278b_timer_busy_start(chip, 1);
ymf278b_C_w(chip, chip->port_C, data, 0);
break;
@ -911,6 +911,7 @@ static void ymf278b_init(device_t *device, YMF278BChip *chip, void (*cb)(device_
chip->romsize = device->region()->bytes();
chip->clock = device->clock();
chip->irq_callback = cb;
chip->timer_base = attotime::from_hz(chip->clock) * (19*36);
chip->timer_a = device->machine().scheduler().timer_alloc(FUNC(ymf278b_timer_a_tick), chip);
chip->timer_b = device->machine().scheduler().timer_alloc(FUNC(ymf278b_timer_b_tick), chip);