void mm1_keyboard_t::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
// handle scan timer
UINT8 data = 0xff;
switch (m_drive)
{
case 0: data = m_y0->read(); break;
case 1: data = m_y1->read(); break;
case 2: data = m_y2->read(); break;
case 3: data = m_y3->read(); break;
case 4: data = m_y4->read(); break;
case 5: data = m_y5->read(); break;
case 6: data = m_y6->read(); break;
case 7: data = m_y7->read(); break;
case 8: data = m_y8->read(); break;
case 9: data = m_y9->read(); break;
}
UINT8 special = m_special->read();
int ctrl = BIT(special, 0);
int shift = BIT(special, 2) & BIT(special, 1);
UINT8 keydata = 0xff;
if (!BIT(data, m_sense))
{
// get key data from PROM
keydata = m_rom->base()[(ctrl << 8) | (shift << 7) | (m_drive << 3) | (m_sense)];
}
if (m_data != keydata)
{
// latch key data
m_data = keydata;
if (keydata != 0xff)
{
// strobe in key data
m_write_kbst(1);
m_write_kbst(0);
}
}
if (keydata == 0xff)
{
// increase scan counters
m_sense++;
if (m_sense == 8)
{
m_sense = 0;
m_drive++;
if (m_drive == 10)
{
m_drive = 0;
}
}
}
}
void mm1_keyboard_t::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
// handle scan timer
uint8_t data = 0xff;
if (m_drive < 10)
{
data = m_y[m_drive]->read();
}
uint8_t special = m_special->read();
int ctrl = BIT(special, 0);
int shift = BIT(special, 2) & BIT(special, 1);
uint8_t keydata = 0xff;
if (!BIT(data, m_sense))
{
// get key data from PROM
keydata = m_rom->base()[(ctrl << 8) | (shift << 7) | (m_drive << 3) | (m_sense)];
}
if (m_data != keydata)
{
// latch key data
m_data = keydata;
if (keydata != 0xff)
{
// strobe in key data
m_write_kbst(1);
m_write_kbst(0);
}
}
if (keydata == 0xff)
{
// increase scan counters
m_sense++;
if (m_sense == 8)
{
m_sense = 0;
m_drive++;
if (m_drive == 10)
{
m_drive = 0;
}
}
}
}
