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fdes2100d: partial revert prev commit

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hap 2022-10-14 19:34:05 +02:00
parent 3e5acb3380
commit cf0f0bfe9f
1 changed files with 14 additions and 10 deletions
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24
src/mame/fidelity/desdis.cpp
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@ -92,12 +92,11 @@ protected:
void fdes2100d_map(address_map &map);
// I/O handlers
void update_lcd();
virtual void control_w(offs_t offset, u8 data);
virtual void lcd_w(offs_t offset, u8 data);
virtual u8 input_r(offs_t offset);
virtual u8 lcd_mask(bool pol) { return pol ? 0 : 0xff; }
u8 m_select = 0;
u32 m_lcd_data = 0;
};
@ -136,7 +135,6 @@ private:
// I/O handlers, slightly different (control_w is d0 instead of d7)
virtual void control_w(offs_t offset, u8 data) override { desdis_state::control_w(offset, data << 7); }
virtual u8 lcd_mask(bool pol) override { return desdis_state::lcd_mask(!pol); }
};
void desmas_state::init_fdes2265()
@ -161,10 +159,18 @@ void desmas_state::init_fdes2265()
I/O
******************************************************************************/
// TTL/generic
void desdis_state::update_lcd()
{
u8 mask = (m_select & 8) ? 0 : 0xff;
for (int i = 0; i < 4; i++)
m_display->write_row(i+2, (m_lcd_data >> (8*i) & 0xff) ^ mask);
}
void desdis_state::control_w(offs_t offset, u8 data)
{
// a0-a2,d7: 74259
u8 prev = m_select;
u8 mask = 1 << offset;
m_select = (m_select & ~mask) | ((data & 0x80) ? mask : 0);
@ -183,12 +189,8 @@ void desdis_state::control_w(offs_t offset, u8 data)
if (m_rombank != nullptr)
m_rombank->set_entry(m_select >> 2 & 1);
// 74259 Q3: lcd polarity (update at any edge)
if ((prev ^ m_select) & 8)
{
for (int i = 0; i < 4; i++)
m_display->write_row(i+2, (m_lcd_data >> (8*i) & 0xff) ^ lcd_mask(m_select & 8));
}
// 74259 Q3: lcd polarity
update_lcd();
}
void desdis_state::lcd_w(offs_t offset, u8 data)
@ -200,6 +202,8 @@ void desdis_state::lcd_w(offs_t offset, u8 data)
m_lcd_data = (m_lcd_data & ~mask) | ((data >> i & 1) ? 0 : mask);
mask <<= 8;
}
update_lcd();
}
u8 desdis_state::input_r(offs_t offset)