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Coco ssc busy delay (#2373)

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tim lindner 2017-06-11 08:49:53 -07:00 committed by Vas Crabb
parent cfe7ff36e6
commit 3d6bd551bc
1 changed files with 36 additions and 9 deletions
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45
src/devices/bus/coco/coco_ssc.cpp
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@ -1,4 +1,4 @@
// license:BSD-3-Clause // license:BSD-3-Clause
// copyright-holders:tim lindner // copyright-holders:tim lindner
/*************************************************************************** /***************************************************************************
@ -92,16 +92,20 @@ namespace
protected: protected:
// device-level overrides // device-level overrides
virtual void device_start() override; virtual void device_start() override;
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
virtual DECLARE_READ8_MEMBER(ff7d_read); virtual DECLARE_READ8_MEMBER(ff7d_read);
virtual DECLARE_WRITE8_MEMBER(ff7d_write); virtual DECLARE_WRITE8_MEMBER(ff7d_write);
virtual void set_sound_enable(bool sound_enable) override; virtual void set_sound_enable(bool sound_enable) override;
static constexpr device_timer_id BUSY_TIMER_ID = 0;
private: private:
uint8_t m_reset_line; uint8_t m_reset_line;
bool m_host_busy; bool m_tms7000_busy;
uint8_t m_tms7000_porta; uint8_t m_tms7000_porta;
uint8_t m_tms7000_portb; uint8_t m_tms7000_portb;
uint8_t m_tms7000_portc; uint8_t m_tms7000_portc;
uint8_t m_tms7000_portd; uint8_t m_tms7000_portd;
emu_timer *m_tms7000_busy_timer;
required_device<cpu_device> m_tms7040; required_device<cpu_device> m_tms7040;
required_device<ram_device> m_staticram; required_device<ram_device> m_staticram;
required_device<ay8910_device> m_ay; required_device<ay8910_device> m_ay;
@ -213,11 +217,14 @@ void coco_ssc_device::device_start()
install_readwrite_handler(0xFF7D, 0xFF7E, rh, wh); install_readwrite_handler(0xFF7D, 0xFF7E, rh, wh);
save_item(NAME(m_reset_line)); save_item(NAME(m_reset_line));
save_item(NAME(m_host_busy)); save_item(NAME(m_tms7000_busy));
save_item(NAME(m_tms7000_porta)); save_item(NAME(m_tms7000_porta));
save_item(NAME(m_tms7000_portb)); save_item(NAME(m_tms7000_portb));
save_item(NAME(m_tms7000_portc)); save_item(NAME(m_tms7000_portc));
save_item(NAME(m_tms7000_portd)); save_item(NAME(m_tms7000_portd));
m_tms7000_busy_timer = timer_alloc(BUSY_TIMER_ID);
} }
@ -228,7 +235,27 @@ void coco_ssc_device::device_start()
void coco_ssc_device::device_reset() void coco_ssc_device::device_reset()
{ {
m_reset_line = 0; m_reset_line = 0;
m_host_busy = false; m_tms7000_busy = false;
}
//-------------------------------------------------
// device_timer - handle timer callbacks
//-------------------------------------------------
void coco_ssc_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
switch(id)
{
case BUSY_TIMER_ID:
m_tms7000_busy = false;
m_tms7000_busy_timer->adjust(attotime::never);
break;
default:
break;
}
} }
@ -282,7 +309,7 @@ READ8_MEMBER(coco_ssc_device::ff7d_read)
case 0x01: case 0x01:
data = 0x1f; data = 0x1f;
if( m_host_busy == false ) if( m_tms7000_busy == false )
{ {
data |= 0x80; data |= 0x80;
} }
@ -339,7 +366,7 @@ WRITE8_MEMBER(coco_ssc_device::ff7d_write)
m_tms7040->reset(); m_tms7040->reset();
m_ay->reset(); m_ay->reset();
m_spo->reset(); m_spo->reset();
m_host_busy = false; m_tms7000_busy = false;
} }
} }
@ -354,7 +381,7 @@ WRITE8_MEMBER(coco_ssc_device::ff7d_write)
} }
m_tms7000_porta = data; m_tms7000_porta = data;
m_host_busy = true; m_tms7000_busy = true;
m_tms7040->set_input_line(TMS7000_INT3_LINE, ASSERT_LINE); m_tms7040->set_input_line(TMS7000_INT3_LINE, ASSERT_LINE);
break; break;
} }
@ -426,9 +453,9 @@ WRITE8_MEMBER(coco_ssc_device::ssc_port_c_w)
m_spo->ald_w(space, 0, m_tms7000_portd); m_spo->ald_w(space, 0, m_tms7000_portd);
} }
if( (data & C_BSY) == 0 ) if( ((m_tms7000_portc & C_BSY) == 0) && ((data & C_BSY) == C_BSY) )
{ {
m_host_busy = false; m_tms7000_busy_timer->adjust(attotime::from_usec(1800));
} }
if (LOG_SSC) if (LOG_SSC)