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Partially fix lamps in Maygay M1A/B hardware

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This commit is contained in:
John Parker 2016-08-13 14:42:27 +01:00
parent 5e52064421
commit f356837886
1 changed files with 15 additions and 3 deletions
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18
src/mame/drivers/maygay1b.cpp
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@ -547,11 +547,20 @@ WRITE8_MEMBER( maygay1b_state::lamp_data_w )
// Because of the nature of the lamping circuit, there is an element of persistance
// As a consequence, the lamp column data can change before the input strobe without
// causing the relevant lamps to black out.
int bit_offset;
for (int i = 0; i < 8; i++)
{
output().set_lamp_value((8*m_lamp_strobe)+i, ((data & (1 << i)) !=0));
if(i < 4)
{
bit_offset = i + 4;
}
else
{
bit_offset = i - 4;
}
output().set_lamp_value((8*m_lamp_strobe)+i, ((data & (1 << bit_offset)) !=0));
}
m_old_lamp_strobe = m_lamp_strobe;
}
@ -565,6 +574,8 @@ READ8_MEMBER( maygay1b_state::kbd_r )
WRITE8_MEMBER( maygay1b_state::lamp_data_2_w )
{
// TODO: THIS FUNCTION IS NEVER CALLED! So we are missing the second half of the lamp matrix
//The two A/B ports are merged back into one, to make one row of 8 lamps.
if (m_old_lamp_strobe2 != m_lamp_strobe2)
@ -575,8 +586,9 @@ WRITE8_MEMBER( maygay1b_state::lamp_data_2_w )
for (int i = 0; i < 8; i++)
{
output().set_lamp_value((8*m_lamp_strobe)+i+128, ((data & (1 << i)) !=0));
output().set_lamp_value((8*m_lamp_strobe2)+i+128, ((data & (1 << i)) !=0));
}
m_old_lamp_strobe2 = m_lamp_strobe2;
}