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roma2.cpp: Use addressable latch device

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This commit is contained in:
AJR 2023-09-18 22:35:59 -04:00
parent f1a50e0b36
commit 6130b026c1
1 changed files with 16 additions and 44 deletions
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60
src/mame/hegenerglaser/roma2.cpp
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@ -25,6 +25,7 @@ TODO:
#include "mmdisplay1.h"
#include "cpu/m68000/m68000.h"
#include "machine/74259.h"
#include "sound/dac.h"
#include "speaker.h"
@ -42,10 +43,12 @@ public:
roma2_state(const machine_config &mconfig, device_type type, const char *tag) :
driver_device(mconfig, type, tag),
m_maincpu(*this, "maincpu"),
m_outlatch(*this, "outlatch"),
m_board(*this, "board"),
m_display(*this, "display"),
m_dac(*this, "dac"),
m_inputs(*this, "IN.%u", 0)
m_inputs(*this, "IN.%u", 0),
m_reset(*this, "RESET")
{ }
DECLARE_INPUT_CHANGED_MEMBER(reset_button);
@ -53,38 +56,24 @@ public:
void roma2(machine_config &config);
void montreal(machine_config &config);
protected:
virtual void machine_start() override;
private:
required_device<cpu_device> m_maincpu;
required_device<hc259_device> m_outlatch;
required_device<mephisto_board_device> m_board;
required_device<mephisto_display1_device> m_display;
required_device<dac_byte_interface> m_dac;
required_ioport_array<4> m_inputs;
optional_ioport m_reset;
void main_map(address_map &map);
void strobe_w(u8 data);
void dac_w(offs_t offset, u8 data);
void input_w(offs_t offset, u8 data);
u8 input_r();
u8 m_dac_data = 0;
u8 m_inp_mux = 0xf;
};
void roma2_state::machine_start()
{
// register for savestates
save_item(NAME(m_dac_data));
save_item(NAME(m_inp_mux));
}
INPUT_CHANGED_MEMBER(roma2_state::reset_button)
{
// RES buttons in serial tied to CPU RESET
if (ioport("RESET")->read() == 3)
if (m_reset->read() == 3)
{
m_maincpu->pulse_input_line(INPUT_LINE_RESET, attotime::zero);
m_display->reset();
@ -97,34 +86,14 @@ INPUT_CHANGED_MEMBER(roma2_state::reset_button)
I/O
*******************************************************************************/
void roma2_state::strobe_w(u8 data)
{
// d0: lcd strobe
m_display->strobe_w(data & 1);
}
void roma2_state::dac_w(offs_t offset, u8 data)
{
// a1,d0: dac data
u8 mask = 1 << offset;
m_dac_data = (m_dac_data & ~mask) | ((data & 1) ? mask : 0);
m_dac->write(m_dac_data);
}
void roma2_state::input_w(offs_t offset, u8 data)
{
// a1-a4,d0: input mux
u8 mask = 1 << offset;
m_inp_mux = (m_inp_mux & ~mask) | ((data & 1) ? mask : 0);
}
u8 roma2_state::input_r()
{
u8 data = 0;
u8 inp_mux = m_outlatch->output_state() & 0xf;
// read keypad
for (int i = 0; i < 4; i++)
if (!BIT(m_inp_mux, i))
if (!BIT(inp_mux, i))
data |= m_inputs[i]->read();
return data;
@ -139,9 +108,7 @@ u8 roma2_state::input_r()
void roma2_state::main_map(address_map &map)
{
map(0x000000, 0x00ffff).rom();
map(0x900000, 0x900007).w(FUNC(roma2_state::input_w)).umask16(0xff00);
map(0x900008, 0x900008).w(FUNC(roma2_state::strobe_w));
map(0x90000c, 0x90000f).w(FUNC(roma2_state::dac_w)).umask16(0xff00);
map(0x900000, 0x90000f).w(m_outlatch, FUNC(hc259_device::write_d0)).umask16(0xff00);
map(0xc00000, 0xc00000).w(m_board, FUNC(mephisto_board_device::mux_w));
map(0xb00000, 0xb00000).w(m_board, FUNC(mephisto_board_device::led_w));
map(0xd00000, 0xd00000).r(m_board, FUNC(mephisto_board_device::input_r));
@ -212,6 +179,11 @@ void roma2_state::roma2(machine_config &config)
M68000(config, m_maincpu, 9.8304_MHz_XTAL);
m_maincpu->set_addrmap(AS_PROGRAM, &roma2_state::main_map);
HC259(config, m_outlatch);
// Q0-Q3: input mux; Q4: strobe; Q6-Q7: DAC
m_outlatch->q_out_cb<4>().set(m_display, FUNC(mephisto_display1_device::strobe_w));
m_outlatch->parallel_out_cb().set(m_dac, FUNC(dac_byte_interface::write)).rshift(6).mask(3);
const attotime irq_period = attotime::from_hz(9.8304_MHz_XTAL / 0x14000); // 120Hz
m_maincpu->set_periodic_int(FUNC(roma2_state::irq5_line_hold), irq_period);
@ -224,7 +196,7 @@ void roma2_state::roma2(machine_config &config)
// sound hardware
SPEAKER(config, "speaker").front_center();
DAC_2BIT_ONES_COMPLEMENT(config, "dac").add_route(ALL_OUTPUTS, "speaker", 0.125);
DAC_2BIT_ONES_COMPLEMENT(config, m_dac).add_route(ALL_OUTPUTS, "speaker", 0.125);
}
void roma2_state::montreal(machine_config &config)