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dev170 - YM2151: fix noise frequency on ymfm

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issue #1441
raising ver num to allow possible compat change
This commit is contained in:
tildearrow 2023-08-30 13:35:22 -05:00
parent 426d4b44f0
commit 63dcacf33d
4 changed files with 12 additions and 6 deletions
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4
src/engine/engine.h
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@ -56,8 +56,8 @@
#define DIV_UNSTABLE
#define DIV_VERSION "dev169"
#define DIV_ENGINE_VERSION 169
#define DIV_VERSION "dev170"
#define DIV_ENGINE_VERSION 170
// for imports
#define DIV_VERSION_MOD 0xff01
#define DIV_VERSION_FC 0xff02

2
src/engine/platform/sound/ymfm/ymfm_opm.cpp
View file

@ -176,7 +176,7 @@ int32_t opm_registers::clock_noise_and_lfo()
{
// base noise frequency is measured at 2x 1/2 FM frequency; this
// means each tick counts as two steps against the noise counter
uint32_t freq = noise_frequency();
uint32_t freq = noise_frequency() ^ 0x1f;
for (int rep = 0; rep < 2; rep++)
{
// evidence seems to suggest the LFSR is clocked continually and just

2
src/engine/platform/sound/ymfm/ymfm_opz.cpp
View file

@ -327,7 +327,7 @@ int32_t opz_registers::clock_noise_and_lfo()
{
// base noise frequency is measured at 2x 1/2 FM frequency; this
// means each tick counts as two steps against the noise counter
uint32_t freq = noise_frequency();
uint32_t freq = noise_frequency() ^ 0x1f;
for (int rep = 0; rep < 2; rep++)
{
// evidence seems to suggest the LFSR is clocked continually and just