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author | Richard Goedeken <Richard@fascinationsoftware.com> | 2015-08-02 13:46:23 -0700 |
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committer | Richard Goedeken <Richard@fascinationsoftware.com> | 2015-08-02 13:46:23 -0700 |
commit | 51309eea058a9d645bffcadd68b06fb7a4a61907 (patch) | |
tree | 292dd73873d6d278bb3c2ced7932153d389f11d0 /src/mess/includes | |
parent | 9a56c3c76c80fa718440efb897c3bb2f02a6b09a (diff) |
1. increase accuracy of TRS-80 Coco audio output by holding the analog output value while the sound_enable line is low. this fixes buzzing noise in Sock Master's Donkey Kong. 2. add comments regarding the interaction between the PIA i/o lines and the analog subsystem
Diffstat (limited to 'src/mess/includes')
-rw-r--r-- | src/mess/includes/coco.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/mess/includes/coco.h b/src/mess/includes/coco.h index e87f5b2f8ed..c0565aba103 100644 --- a/src/mess/includes/coco.h +++ b/src/mess/includes/coco.h @@ -243,6 +243,10 @@ private: // DAC output UINT8 m_dac_output; + // remember the last audio sample level from the analog sources (DAC, cart, cassette) so that we don't + // introduce step changes when the audio output is enabled/disabled via PIA1 CB2 + UINT8 m_analog_audio_level; + // hires interface emu_timer *m_hiresjoy_transition_timer[2]; bool m_hiresjoy_ca; |