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machine/micomx1a.cpp: Slightly better timings.

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This commit is contained in:
Vas Crabb 2022-12-19 02:59:06 +11:00
parent bfa14b837b
commit 90142acc70
1 changed files with 40 additions and 24 deletions
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64
src/devices/machine/micomxe1a.cpp
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@ -122,7 +122,7 @@ micom_xe_1a_device::micom_xe_1a_device(
m_req(1),
m_mode(1),
m_interface(0),
m_out(0x2e)
m_out(0x2f)
{
}
@ -260,7 +260,7 @@ WRITE_LINE_MEMBER(micom_xe_1a_device::mode_w)
{
LOG("Digital mode selected\n");
m_output_timer->enable(false);
m_out = 0x2e;
m_out = 0x2f;
}
m_mode = mode;
}
@ -281,7 +281,7 @@ void micom_xe_1a_device::device_start()
m_output_timer = timer_alloc(FUNC(micom_xe_1a_device::step_output), this);
std::fill(std::begin(m_data), std::end(m_data), 0x00);
m_out = 0x2e;
m_out = 0x2f;
save_item(NAME(m_req));
save_item(NAME(m_mode));
@ -293,31 +293,47 @@ void micom_xe_1a_device::device_start()
TIMER_CALLBACK_MEMBER(micom_xe_1a_device::step_output)
{
auto const step = param >> 1;
if (!BIT(param, 0))
auto const step = param >> 2;
auto const phase = param & 0x03;
switch (phase)
{
auto const nybble = step ^ m_interface;
if ((std::size(m_data) * 2) > step)
m_out = BIT(m_data[nybble >> 1], BIT(nybble, 0) ? 4 : 0, 4);
else
m_out = 0xe;
m_out |= BIT(step, 0) ? 0x30 : 0x20;
LOG(
"Set nybble %u data = 0x%X, L/H = %d, /Ack = 1\n",
step,
BIT(m_out, 0, 4),
BIT(m_out, 4));
case 0:
{
auto const nybble = step ^ m_interface;
if ((std::size(m_data) * 2) > step)
m_out = BIT(m_data[nybble >> 1], BIT(nybble, 0) ? 4 : 0, 4);
else
m_out = 0x0f;
m_out |= BIT(step, 0) ? 0x30 : 0x20;
LOG(
"Set nybble %u data = 0x%X, L/H = %d, /Ack = 1\n",
step,
BIT(m_out, 0, 4),
BIT(m_out, 4));
if ((std::size(m_data) * 2) > step)
{
m_output_timer->adjust(
attotime::from_nsec(BIT(step, 0) ? 3'800 : 18'000),
param + 1);
}
}
break;
case 1:
if ((std::size(m_data) * 2) > step)
{
m_out &= 0x1f;
LOG("Set nybble %u /Ack = 0\n", step);
m_output_timer->adjust(
attotime::from_nsec(BIT(step, 0) ? 3'800 : 21'800),
param + 1);
attotime::from_nsec(12'100),
param + (BIT(step, 0) ? 1 : 3));
}
}
else if ((std::size(m_data) * 2) > step)
{
m_out &= 0x1f;
LOG("Set nybble %u /Ack = 0\n", step);
m_output_timer->adjust(attotime::from_nsec(12'100), param + 1);
break;
case 2:
m_out |= 0x20;
LOG("Set nybble %u /Ack = 1\n", step);
m_output_timer->adjust(attotime::from_nsec(3'800), param + 2);
break;
}
}