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(MESS) Fixed PC/XT keyboard interface. (nw)

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This commit is contained in:
Curt Coder 2013-07-06 20:39:31 +00:00
parent 1e4c01c7e6
commit e2fef83146
1 changed files with 13 additions and 26 deletions
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39
src/mess/machine/genpc.c
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@ -296,29 +296,15 @@ const struct pit8253_interface pc_pit8253_config =
**********************************************************/
WRITE_LINE_MEMBER( ibm5160_mb_device::keyboard_clock_w )
{
if ( m_ppi_clock_signal != state )
if (!m_ppi_keyboard_clear && !state && !m_ppi_shift_enable)
{
if ( m_ppi_keyb_clock && m_ppi_shift_enable )
{
m_ppi_clock_signal = state;
if ( ! m_ppi_keyboard_clear )
{
/* Data is clocked in on a high->low transition */
if ( ! state )
{
UINT8 trigger_irq = m_ppi_shift_register & 0x01;
m_ppi_shift_enable = m_ppi_shift_register & 0x01;
m_ppi_shift_register = ( m_ppi_shift_register >> 1 ) | ( m_ppi_data_signal << 7 );
if ( trigger_irq )
{
m_pic8259->ir1_w(1);
m_ppi_shift_enable = 0;
m_ppi_clock_signal = 0;
m_pc_kbdc->clock_write_from_mb(m_ppi_clock_signal);
}
}
}
}
m_ppi_shift_register >>= 1;
m_ppi_shift_register |= m_ppi_data_signal << 7;
m_pic8259->ir1_w(m_ppi_shift_enable);
m_pc_kbdc->data_write_from_mb(!BIT(m_ppi_portb, 2) && !m_ppi_shift_enable);
}
}
@ -395,16 +381,17 @@ WRITE8_MEMBER( ibm5160_mb_device::pc_ppi_portb_w )
m_pit8253->gate2_w(BIT(data, 0));
pc_speaker_set_spkrdata( data & 0x02 );
m_ppi_clock_signal = ( m_ppi_keyb_clock ) ? 1 : 0;
m_pc_kbdc->clock_write_from_mb(m_ppi_clock_signal);
/* If PB7 is set clear the shift register and reset the IRQ line */
if ( m_ppi_keyboard_clear )
{
m_pic8259->ir1_w(0);
m_ppi_shift_register = 0;
m_ppi_shift_enable = 1;
m_ppi_shift_enable = 0;
m_pic8259->ir1_w(m_ppi_shift_enable);
}
m_pc_kbdc->data_write_from_mb(!BIT(m_ppi_portb, 2) && !m_ppi_shift_enable);
m_ppi_clock_signal = ( m_ppi_keyb_clock ) ? 1 : 0;
m_pc_kbdc->clock_write_from_mb(m_ppi_clock_signal);
}