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VG5000µ printer more accurate support. (#7489) [S. Glaize]

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To emit the character, it is first latched on port ($10) then a rising edge is produced on port ($11).
This commit is contained in:
Sylvain Glaize 2020-11-17 08:33:45 +01:00 committed by GitHub
parent 48d1f0de37
commit 2a9de8e426
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 25 additions and 9 deletions
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34
src/mame/drivers/vg5k.cpp
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@ -92,13 +92,16 @@ private:
required_device<ram_device> m_ram;
offs_t m_ef9345_offset;
uint8_t m_printer_latch;
uint8_t m_printer_signal;
virtual void machine_start() override;
virtual void machine_reset() override;
void z80_m1_w(uint8_t data);
uint8_t printer_r();
void printer_w(uint8_t data);
uint8_t printer_state_r();
void printer_state_w(uint8_t data);
void printer_data_w(uint8_t data);
void ef9345_offset_w(uint8_t data);
uint8_t ef9345_io_r();
void ef9345_io_w(uint8_t data);
@ -121,15 +124,24 @@ void vg5k_state::z80_m1_w(uint8_t data)
m_maincpu->adjust_icount(-1);
}
uint8_t vg5k_state::printer_r()
uint8_t vg5k_state::printer_state_r()
{
return (m_printer->is_ready() ? 0x00 : 0xff);
}
void vg5k_state::printer_w(uint8_t data)
void vg5k_state::printer_state_w(uint8_t data)
{
m_printer->output(data);
// Character is emitted on a rising edge.
if (!BIT(m_printer_signal, 0) && BIT(data, 0)) {
m_printer->output(m_printer_latch);
}
m_printer_signal = data;
}
void vg5k_state::printer_data_w(uint8_t data)
{
m_printer_latch = data;
}
@ -194,8 +206,8 @@ void vg5k_state::vg5k_io(address_map &map)
map(0x08, 0x08).portr("JOY1");
/* printer */
map(0x10, 0x10).r(FUNC(vg5k_state::printer_r));
map(0x11, 0x11).w(FUNC(vg5k_state::printer_w));
map(0x10, 0x10).rw(FUNC(vg5k_state::printer_state_r), FUNC(vg5k_state::printer_state_w));
map(0x11, 0x11).w(FUNC(vg5k_state::printer_data_w));
/* keyboard */
map(0x80, 0x80).portr("ROW1");
@ -342,11 +354,15 @@ INPUT_CHANGED_MEMBER(vg5k_state::delta_button)
void vg5k_state::machine_start()
{
save_item(NAME(m_ef9345_offset));
save_item(NAME(m_printer_latch));
save_item(NAME(m_printer_signal));
}
void vg5k_state::machine_reset()
{
m_ef9345_offset = 0;
m_ef9345_offset = 0;
m_printer_latch = 0;
m_printer_signal = 0;
}