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Work round a race condition in the Compaq i8042 rom. Fixes using ctmouse.exe (v2.1 beta4) in shutms11. [smf]

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This commit is contained in:
smf- 2025-04-17 14:24:31 +01:00
parent f724192b85
commit 7fc77f3f4c
2 changed files with 16 additions and 1 deletions
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15
src/devices/machine/at_keybc.cpp
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@ -484,6 +484,8 @@ void ps2_keyboard_controller_device::device_start()
{
at_kbc_device_base::device_start();
m_aux_irq_timer = timer_alloc(FUNC(ps2_keyboard_controller_device::set_aux_irq_timer_callback), this);
save_item(NAME(m_aux_irq));
save_item(NAME(m_aux_clk_in));
save_item(NAME(m_aux_clk_out));
@ -552,6 +554,17 @@ void ps2_keyboard_controller_device::p2_w(uint8_t data)
if (BIT(data & ~m_p2_data, 4))
set_kbd_irq(1U);
if (BIT(data & ~m_p2_data, 5))
set_aux_irq(1U);
{
// HACK: delay raising the aux irq until compaq queues the data
if (m_mcu->pcbase() == 0x7ba)
m_aux_irq_timer->adjust(attotime::from_hz(clock() / 16));
else
set_aux_irq(1U);
}
m_p2_data = data;
}
TIMER_CALLBACK_MEMBER(ps2_keyboard_controller_device::set_aux_irq_timer_callback)
{
set_aux_irq(1U);
}

2
src/devices/machine/at_keybc.h
View File

@ -144,11 +144,13 @@ private:
// internal sync helpers
TIMER_CALLBACK_MEMBER(set_aux_clk_in);
TIMER_CALLBACK_MEMBER(set_aux_data_in);
TIMER_CALLBACK_MEMBER(set_aux_irq_timer_callback);
// MCU I/O handlers
uint8_t p1_r();
void p2_w(uint8_t data);
emu_timer* m_aux_irq_timer;
devcb_write_line m_aux_irq_cb;
devcb_write_line m_aux_clk_cb, m_aux_data_cb;