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VG5000µ update:

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- Add support for the "Delta" key

The "Delta" key on the VG5000µ keyboard is wired to directly assert the NMI line of the Z80. The handler for the NMI in the BASIC ROM checks if the CTRL key is also depressed and then causes a soft reset.

This routine can be hooked to produce other effects than soft reset.
This commit is contained in:
Sylvain Glaize 2020-09-01 21:34:31 +02:00
parent a725448612
commit 6c05d358e7
1 changed files with 13 additions and 0 deletions
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13
src/mame/drivers/vg5k.cpp
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@ -82,6 +82,8 @@ public:
void init_vg5k();
DECLARE_INPUT_CHANGED_MEMBER(delta_button);
private:
required_device<z80_device> m_maincpu;
required_device<ef9345_device> m_ef9345;
@ -306,6 +308,8 @@ static INPUT_PORTS_START( vg5k )
PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNUSED )
PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNUSED )
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNUSED )
PORT_START("direct")
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_END) PORT_NAME("DELTA") PORT_CHANGED_MEMBER(DEVICE_SELF, vg5k_state, delta_button, 0)
INPUT_PORTS_END
@ -327,6 +331,14 @@ TIMER_DEVICE_CALLBACK_MEMBER(vg5k_state::vg5k_scanline)
m_ef9345->update_scanline((uint16_t)param);
}
INPUT_CHANGED_MEMBER(vg5k_state::delta_button)
{
// The yellow Delta key on the keyboard is wired so that it asserts directly the NMI line of the Z80.
if (!newval) {
m_maincpu->pulse_input_line(INPUT_LINE_NMI, attotime::zero);
}
}
void vg5k_state::machine_start()
{
@ -338,6 +350,7 @@ void vg5k_state::machine_reset()
m_ef9345_offset = 0;
}
/* F4 Character Displayer */
static const gfx_layout vg5k_charlayout =
{