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author Vas Crabb <vas@vastheman.com>2019-12-06 23:56:12 +1100
committer Vas Crabb <vas@vastheman.com>2019-12-06 23:56:12 +1100
commita36dd336b898007c821ebaf8f0bd5109571bf75c (patch)
tree34bf7f0b2887af2d4a48d3d25214862deaec86cd /src/mame
parentbe7476e81bafad3ec7b5c4f501fbd131bfdf1911 (diff)
osborne1.cpp: don't need the timer to run every scanline if it's only for the beep (doesn't really improve performance)
Diffstat (limited to 'src/mame')
-rw-r--r--src/mame/machine/osborne1.cpp10
1 files changed, 5 insertions, 5 deletions
diff --git a/src/mame/machine/osborne1.cpp b/src/mame/machine/osborne1.cpp
index f76215ddbed..9bbe9f153d5 100644
--- a/src/mame/machine/osborne1.cpp
+++ b/src/mame/machine/osborne1.cpp
@@ -464,15 +464,15 @@ uint32_t osborne1sp_state::screen_update(screen_device &screen, bitmap_ind16 &bi
TIMER_CALLBACK_MEMBER(osborne1_state::video_callback)
{
- int const y = m_screen->vpos();
- uint8_t const ra = y % 10;
- uint8_t const port_b = m_pia1->b_output();
+ int const y(m_screen->vpos());
+ uint8_t const ra(y % 10);
// The beeper is gated so it's active four out of every ten scanlines
m_beep_state = (ra & 0x04) ? 1 : 0;
- m_speaker->level_w((BIT(port_b, 5) && m_beep_state) ? 1 : 0);
+ m_speaker->level_w((m_beep_state && BIT(m_pia1->b_output(), 5)) ? 1 : 0);
- m_video_timer->adjust(m_screen->time_until_pos(y + 1, 0));
+ int const next((10 * (y / 10)) + ((ra < 4) ? 4 : (ra < 8) ? 8 : 14));
+ m_video_timer->adjust(m_screen->time_until_pos((m_screen->height() > next) ? next : 0, 0));
}
TIMER_CALLBACK_MEMBER(osborne1_state::acia_rxc_txc_callback)