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rgum.cpp: Improve peripheral hookups; add uPD7759 controls

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This commit is contained in:
AJR 2021-10-23 20:19:42 -04:00
parent e778bb9a8c
commit 4e34735d0f
1 changed files with 75 additions and 8 deletions
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83
src/mame/drivers/rgum.cpp
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@ -43,6 +43,8 @@ public:
m_vram(*this, "vram"),
m_cram(*this, "cram"),
m_maincpu(*this, "maincpu"),
m_aysnd(*this, "aysnd"),
m_upd(*this, "upd"),
m_gfxdecode(*this, "gfxdecode"),
m_palette(*this, "palette") { }
@ -52,14 +54,26 @@ public:
protected:
virtual void video_start() override;
virtual void machine_reset() override;
private:
required_shared_ptr<uint8_t> m_vram;
required_shared_ptr<uint8_t> m_cram;
required_device<cpu_device> m_maincpu;
required_device<ay8910_device> m_aysnd;
required_device<upd7759_device> m_upd;
required_device<gfxdecode_device> m_gfxdecode;
required_device<palette_device> m_palette;
uint8_t m_hbeat;
bool m_aysnd_data_next;
bool m_aysnd_toggle_enabled;
void aysnd_2000_w(uint8_t data);
void aysnd_2002_w(uint8_t data);
void upd_data_w(uint8_t data);
uint8_t upd_ready_r();
uint8_t upd_busy_r();
uint8_t upd_reset_r();
uint32_t screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
void main_map(address_map &map);
@ -71,6 +85,14 @@ void rgum_state::video_start()
m_hbeat = 0;
save_item(NAME(m_hbeat));
save_item(NAME(m_aysnd_data_next));
save_item(NAME(m_aysnd_toggle_enabled));
}
void rgum_state::machine_reset()
{
m_aysnd_data_next = false;
m_aysnd_toggle_enabled = false;
}
uint32_t rgum_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
@ -94,6 +116,51 @@ uint32_t rgum_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap,
return 0;
}
void rgum_state::aysnd_2000_w(uint8_t data)
{
m_aysnd_toggle_enabled = true;
}
void rgum_state::aysnd_2002_w(uint8_t data)
{
// AY-3-8910 interface is bizarre. Address is written to $2000 and then $2002 with successive instructions, then data is written to both $2000 and $2002.
// Sound data contains many pairs where the address byte is $50. Do these control some other device?
m_aysnd->address_data_w(m_aysnd_data_next, data);
if (m_aysnd_toggle_enabled)
{
m_aysnd_data_next = !m_aysnd_data_next;
m_aysnd_toggle_enabled = false;
}
}
void rgum_state::upd_data_w(u8 data)
{
m_upd->port_w(data);
m_upd->start_w(1);
}
uint8_t rgum_state::upd_ready_r()
{
if (!machine().side_effects_disabled())
{
m_upd->reset_w(1);
m_upd->start_w(0);
}
return 0;
}
uint8_t rgum_state::upd_busy_r()
{
return m_upd->busy_r() ? 0x80 : 0;
}
uint8_t rgum_state::upd_reset_r()
{
if (!machine().side_effects_disabled())
m_upd->reset_w(0);
return 0;
}
void rgum_state::main_map(address_map &map) // TODO: map MK48Z08B-10, second 8255, UPD7759
{
map(0x0000, 0x07ff).ram(); // not all of it?
@ -101,14 +168,15 @@ void rgum_state::main_map(address_map &map) // TODO: map MK48Z08B-10, second 825
map(0x0800, 0x0800).w("crtc", FUNC(mc6845_device::address_w));
map(0x0801, 0x0801).rw("crtc", FUNC(mc6845_device::register_r), FUNC(mc6845_device::register_w));
map(0x2000, 0x2000).w("aysnd", FUNC(ay8910_device::data_w));
map(0x2002, 0x2002).rw("aysnd", FUNC(ay8910_device::data_r), FUNC(ay8910_device::address_w));
map(0x2000, 0x2000).w(FUNC(rgum_state::aysnd_2000_w));
map(0x2002, 0x2002).r("aysnd", FUNC(ay8910_device::data_r)).w(FUNC(rgum_state::aysnd_2002_w));
map(0x2801, 0x2801).nopr(); // read but value discarded?
map(0x2802, 0x2802).nopr();
map(0x2803, 0x2803).nopr();
map(0x2800, 0x2800).w(FUNC(rgum_state::upd_data_w));
map(0x2801, 0x2801).r(FUNC(rgum_state::upd_ready_r));
map(0x2802, 0x2802).r(FUNC(rgum_state::upd_busy_r));
map(0x2803, 0x2803).r(FUNC(rgum_state::upd_reset_r));
// map(0x2c00, 0x2c03).w(); // ?
map(0x2c00, 0x2c03).w("ppi8255_1", FUNC(i8255_device::write));
map(0x3000, 0x3003).rw("ppi8255_0", FUNC(i8255_device::read), FUNC(i8255_device::write));
@ -121,8 +189,6 @@ void rgum_state::main_map(address_map &map) // TODO: map MK48Z08B-10, second 825
READ_LINE_MEMBER(rgum_state::heartbeat_r)
{
m_hbeat ^= 1;
return m_hbeat;
}
@ -289,6 +355,7 @@ void rgum_state::rgum(machine_config &config)
ppi.in_pa_callback().set_ioport("IN0");
ppi.in_pb_callback().set_ioport("DSW1");
ppi.in_pc_callback().set_ioport("DSW2");
ppi.out_pc_callback().set([this](uint8_t data) { m_hbeat = BIT(data, 0); });
I8255A(config, "ppi8255_1");