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alphatpx: work around different p30 keybc behavior (nw)

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This commit is contained in:
cracyc 2018-02-25 17:19:13 -06:00
parent c7f5700d0a
commit 2105e03139
1 changed files with 9 additions and 2 deletions
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9
src/mame/drivers/alphatpx.cpp
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@ -165,6 +165,7 @@ public:
m_floppy(*this, "fdc:%u", 0),
m_i8088(*this, "i8088"),
m_beep(*this, "beeper"),
m_pic(*this, "pic8259"),
m_keycols(*this, "COL.%u", 0),
m_palette(*this, "palette"),
m_vram(*this, "vram"),
@ -214,6 +215,7 @@ protected:
required_device_array<floppy_connector, 2> m_floppy;
optional_device<cpu_device> m_i8088;
required_device<beep_device> m_beep;
optional_device<pic8259_device> m_pic;
required_ioport_array<16> m_keycols;
private:
@ -339,6 +341,7 @@ READ8_MEMBER(alphatp_34_state::comm88_r)
{
if(!offset)
return (m_85_da ? 0 : 1) | (m_88_da ? 0 : 0x80);
if(m_i8088)
m_i8088->set_input_line(INPUT_LINE_TEST, ASSERT_LINE);
m_85_da = false;
return m_85_data;
@ -347,6 +350,8 @@ READ8_MEMBER(alphatp_34_state::comm88_r)
WRITE8_MEMBER(alphatp_34_state::comm88_w)
{
m_88_data = data;
if(m_pic)
m_pic->ir2_w(ASSERT_LINE);
m_88_da = true;
}
@ -354,6 +359,7 @@ READ8_MEMBER(alphatp_34_state::comm85_r)
{
if(!offset)
return m_88_da ? 0 : 1;
m_pic->ir2_w(CLEAR_LINE);
m_88_da = false;
return m_88_data;
}
@ -409,8 +415,9 @@ READ_LINE_MEMBER(alphatp_34_state::kbd_matrix_r)
WRITE8_MEMBER(alphatp_34_state::kbd_matrix_w)
{
if ((data & 0x80) && (!m_kbdclk))
if (data & 0x80)
{
data--; // FIXME: the p30 kbc program doesn't clock the keyboard but gets the wrong value from t0
const ioport_value tmp_read = m_keycols[(data >> 3) & 0xf]->read() & (1 << (data & 0x7));
m_kbdread = (tmp_read != 0) ? 1 : 0;
}