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cz101: Cleanup, add notes, document ports

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This commit is contained in:
Dirk Best 2018-03-22 14:08:52 +01:00
parent d4b59a7994
commit a5fb45d929
1 changed files with 24 additions and 20 deletions
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44
src/mame/drivers/cz101.cpp
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@ -6,6 +6,12 @@
Digital Synthesizer
TODO:
- To get the display to show something, our uPD7810 core needs to
output the full port value even if the port is set as input (port a).
- Currently seems to hang while processing the serial ports (midi). Our
uPD7810 core is lacking the externally clocked serial mode.
***************************************************************************/
#include "emu.h"
@ -29,8 +35,7 @@ public:
m_maincpu(*this, "maincpu"),
m_hd44780(*this, "hd44780"),
m_keys(*this, "kc%u", 0),
m_port_b(0), m_port_c(0),
m_midi_clock(0)
m_port_b(0), m_port_c(0)
{ }
void cz101(machine_config &config);
@ -60,11 +65,9 @@ private:
DECLARE_WRITE8_MEMBER(led_3_w);
DECLARE_WRITE8_MEMBER(led_4_w);
DECLARE_READ8_MEMBER(keys_r);
DECLARE_WRITE_LINE_MEMBER(midi_clock_w);
uint8_t m_port_b;
uint8_t m_port_c;
uint8_t m_midi_clock;
};
@ -312,6 +315,8 @@ READ8_MEMBER( cz101_state::keys_r )
return m_keys[m_port_b & 0x0f]->read();
}
// 76543210 lcd data bus
READ8_MEMBER( cz101_state::port_a_r )
{
if ((BIT(m_port_c, 7) == 1) && (BIT(m_port_c, 6) == 1))
@ -326,6 +331,12 @@ WRITE8_MEMBER( cz101_state::port_a_w )
m_hd44780->write(space, BIT(m_port_c, 5), data);
}
// 7------- nmi output
// -6------ music lsi write enable
// --5----- music lsi chip select
// ---4---- music lsi irq input
// ----3210 key select output
WRITE8_MEMBER( cz101_state::port_b_w )
{
if (1)
@ -334,14 +345,14 @@ WRITE8_MEMBER( cz101_state::port_b_w )
m_port_b = data;
}
READ8_MEMBER( cz101_state::port_c_r )
{
uint8_t data = 0;
data |= m_midi_clock << 2;
return data;
}
// 7------- lcd e
// -6------ lcd rw
// --5----- lcd rs
// ---4---- not used
// ----3--- power down detection output
// -----2-- midi clock
// ------1- midi input
// -------0 midi output
WRITE8_MEMBER( cz101_state::port_c_w )
{
@ -351,17 +362,11 @@ WRITE8_MEMBER( cz101_state::port_c_w )
m_port_c = data;
}
WRITE_LINE_MEMBER( cz101_state::midi_clock_w )
{
m_midi_clock = state;
}
void cz101_state::machine_start()
{
// register for save states
save_item(NAME(m_port_b));
save_item(NAME(m_port_c));
save_item(NAME(m_midi_clock));
}
void cz101_state::machine_reset()
@ -379,11 +384,10 @@ MACHINE_CONFIG_START( cz101_state::cz101 )
MCFG_UPD7810_PORTA_READ_CB(READ8(cz101_state, port_a_r))
MCFG_UPD7810_PORTA_WRITE_CB(WRITE8(cz101_state, port_a_w))
MCFG_UPD7810_PORTB_WRITE_CB(WRITE8(cz101_state, port_b_w))
MCFG_UPD7810_PORTC_READ_CB(READ8(cz101_state, port_c_r))
MCFG_UPD7810_PORTC_WRITE_CB(WRITE8(cz101_state, port_c_w))
MCFG_CLOCK_ADD("midi_clock", 2_MHz_XTAL)
MCFG_CLOCK_SIGNAL_HANDLER(WRITELINE(cz101_state, midi_clock_w))
// MCFG_CLOCK_SIGNAL_HANDLER(DEVWRITELINE("maincpu", upd7810_device, sck_w)) not supported yet
// video hardware
MCFG_SCREEN_ADD("screen", LCD)