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TMS5110: Add same FAST_START_HACK as in tms5220, makes snmath word delay closer to hardware. [Lord Nightmare]

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Lord-Nightmare 2015-08-30 16:36:38 -04:00
parent 1a197f1856
commit fbacff0ace
1 changed files with 11 additions and 1 deletions
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12
src/emu/sound/tms5110.c
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@ -78,10 +78,14 @@ static INT16 clip_analog(INT16 cliptemp);
//define INTERP_SHIFT / (1<<m_coeff->interp_coeff[m_IP])
/* Other hacks */
/* HACK?: if defined, outputs the low 4 bits of the lattice filter to the i/o
/* HACK: if defined, outputs the low 4 bits of the lattice filter to the i/o
* or clip logic, even though the real hardware doesn't do this, partially verified by decap */
#undef ALLOW_4_LSB
/* forces m_TALK active instantly whenever m_SPEN would be activated, causing speech delay to be reduced by up to one frame time */
/* for some reason, this hack makes snmath behave marginally more accurate to hardware, though it does not match the patent */
#define FAST_START_HACK 1
/* *****configuration of chip connection stuff***** */
/* must be defined; if 0, output the waveform as if it was tapped on the speaker pin as usual, if 1, output the waveform as if it was tapped on the i/o pin (volume is much lower in the latter case) */
@ -851,6 +855,9 @@ void tms5110_device::PDC_set(int data)
#endif
perform_dummy_read();
m_SPEN = 1; /* start immediately */
#ifdef FAST_START_HACK
m_TALK = 1;
#endif
/* clear out variables before speaking */
m_zpar = 1; // zero all the parameters
m_uv_zpar = 1; // zero k4-k10 as well
@ -886,6 +893,9 @@ void tms5110_device::PDC_set(int data)
#endif
perform_dummy_read();
m_SPEN = 1; /* start immediately */
#ifdef FAST_START_HACK
m_TALK = 1;
#endif
/* clear out variables before speaking */
m_zpar = 1; // zero all the parameters
m_uv_zpar = 1; // zero k4-k10 as well