void mm74c922_device::detect_keypress()
{
uint8_t data = 0xff;
switch (m_x)
{
case 0: data = m_read_x1(0); break;
case 1: data = m_read_x2(0); break;
case 2: data = m_read_x3(0); break;
case 3: data = m_read_x4(0); break;
case 4: data = m_read_x5(0); break;
}
if (m_inhibit)
{
if (BIT(data, m_y))
{
// key released
m_inhibit = 0;
m_next_da = 0;
m_data = 0xff; // high-Z
LOG("MM74C922 Key Released\n");
}
}
else
{
for (int y = 0; y < m_max_y; y++)
{
if (!BIT(data, y))
{
// key depressed
m_inhibit = 1;
m_next_da = 1;
m_y = y;
m_data = (y << 2) | m_x;
LOG("MM74C922 Key Depressed: X %u Y %u = %02x\n", m_x, y, m_data);
return;
}
}
}
}
void ay3600_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
int ako = 0;
for (int x = 0; x < 9; x++)
{
UINT16 data = 0;
switch(x)
{
case 0: data = m_read_x0(); break;
case 1: data = m_read_x1(); break;
case 2: data = m_read_x2(); break;
case 3: data = m_read_x3(); break;
case 4: data = m_read_x4(); break;
case 5: data = m_read_x5(); break;
case 6: data = m_read_x6(); break;
case 7: data = m_read_x7(); break;
case 8: data = m_read_x8(); break;
}
for (int y = 0; y < 10; y++)
{
int b = (x * 10) + y;
if (b > 63)
{
b -= 64;
b = 0x100 | b;
}
b |= (m_read_shift() << 6);
b |= (m_read_control() << 7);
if (BIT(data, y))
{
if (!(m_x_mask[x] & (1 << y)))
{
ako = 1;
m_x_mask[x] |= (1 << y);
if (m_b != b)
{
m_b = b;
m_write_data_ready(1);
return;
}
}
}
else // key released, unmark it from the "down" info
{
m_x_mask[x] &= ~(1 << y);
}
}
}
if (!ako)
{
m_b = -1;
}
if (ako != m_ako)
{
m_write_ako(ako);
m_ako = ako;
}
}
void ay3600_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
int ako = 0;
for (int x = 0; x < 9; x++)
{
UINT16 data = 0;
switch(x)
{
case 0: data = m_read_x0(); break;
case 1: data = m_read_x1(); break;
case 2: data = m_read_x2(); break;
case 3: data = m_read_x3(); break;
case 4: data = m_read_x4(); break;
case 5: data = m_read_x5(); break;
case 6: data = m_read_x6(); break;
case 7: data = m_read_x7(); break;
case 8: data = m_read_x8(); break;
}
for (int y = 0; y < 10; y++)
{
int b = (x * 10) + y;
if (b > 63)
{
b -= 64;
b = 0x100 | b;
}
b |= (m_read_shift() << 6);
b |= (m_read_control() << 7);
if (BIT(data, y))
{
bool found = false;
// is this key already down?
for (int k = 0; k < MAX_KEYS_DOWN; k++)
{
if (b == m_keys_down[k])
{
found = true;
break;
}
}
if (!found)
{
ako = 1;
if (m_b != b)
{
m_b = b;
m_write_data_ready(1);
return;
}
// add to the keys down list
for (int k = 0; k < MAX_KEYS_DOWN; k++)
{
if (m_keys_down[k] == -1)
{
m_keys_down[k] = b;
break;
}
}
}
}
else // key released, unmark it from the keys_down table
{
for (int k = 0; k < MAX_KEYS_DOWN; k++)
{
if (b == m_keys_down[k])
{
m_keys_down[k] = -1;
}
}
}
}
}
if (!ako)
{
m_b = -1;
}
if (ako != m_ako)
{
m_write_ako(ako);
m_ako = ako;
}
}