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~ fixed a regression that broke STOP instruction behavior

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~ modified LFO implementation to make it handles signed displacement value correctly (is that correct ? still need to be verified against real hardware)
This commit is contained in:
ekeeke31 2009-06-16 15:51:29 +00:00
parent 0c8c30e3a2
commit 72ec155b38
2 changed files with 12 additions and 12 deletions
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14
source/m68k/m68kcpu.c
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@ -836,13 +836,6 @@ extern uint32 count_m68k;
void m68k_run (int cyc)
{
/* Make sure we're not stopped */
if(CPU_STOPPED)
{
count_m68k = cyc;
return;
}
int temp;
/* Return point if we had an address error */
@ -870,6 +863,13 @@ void m68k_run (int cyc)
CPU_INT_CYCLES = 0;
}
/* Make sure we're not stopped */
if(CPU_STOPPED)
{
count_m68k = cyc;
return;
}
/* execute a single instruction */
count_m68k += m68k_execute();
}

10
source/sound/ym2612.c
View File

@ -30,7 +30,7 @@
** - implemented correct SSG-EG emulation (Asterix, Beavis&Butthead, Bubba'n Six & many others)
** - adjusted some EG rates
** - modified address/data port behavior
** - fixed LFO implementation (only 11 bits of precision)
** - fixed Phase Modulation (LFO) calculations (precision reduced to 11 bits)
**
** TODO: complete SSG-EG documentation
**
@ -1244,8 +1244,8 @@ INLINE void update_phase_lfo_slot(FM_SLOT *SLOT , INT32 pms, UINT32 block_fnum)
/* retrieve BLOCK register value */
UINT8 blk = (block_fnum >> 11) & 7;
/* increase FNUM register value */
UINT32 fn = (block_fnum + lfo_fn_table_index_offset) & 0x7ff;
/* apply phase modulation to FNUM register value */
UINT32 fn = (block_fnum + (UINT32)lfo_fn_table_index_offset) & 0x7ff;
/* recalculate keyscale code */
int kc = (blk<<2) | opn_fktable[fn >> 7];
@ -1277,8 +1277,8 @@ INLINE void update_phase_lfo_channel(FM_CH *CH)
/* retrieve BLOCK register value */
UINT8 blk = (block_fnum >> 11) & 7;
/* increase FNUM register value */
UINT32 fn = (block_fnum + lfo_fn_table_index_offset)& 0x7ff;
/* apply phase modulation to FNUM register value */
UINT32 fn = (block_fnum + (UINT32)lfo_fn_table_index_offset) & 0x7ff;
/* recalculate keyscale code */
int kc = (blk<<2) | opn_fktable[fn >> 7];