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osborne1.cpp: don't need the timer to run every scanline if it's only for the beep (doesn't really improve performance)

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This commit is contained in:
Vas Crabb 2019-12-06 23:56:12 +11:00
parent be7476e81b
commit a36dd336b8
1 changed files with 5 additions and 5 deletions
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10
src/mame/machine/osborne1.cpp
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@ -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)