Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-04-25 09:50:04 +03:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

poly1: Add software-selected baud rate divider (nw)

Browse Source
This commit is contained in:
AJR 2017-10-27 18:30:09 -04:00
parent 25a2a8bd27
commit 3302c1a0c0
1 changed files with 14 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
src/mame/drivers/poly.cpp
View File

@ -54,6 +54,7 @@ public:
, m_pia1(*this, "pia1")
, m_ptm(*this, "ptm")
, m_speaker(*this, "speaker")
, m_acia_clock(*this, "acia_clock")
, m_videoram(*this, "videoram")
{ }
@ -62,6 +63,7 @@ public:
DECLARE_READ8_MEMBER(videoram_r);
DECLARE_WRITE_LINE_MEMBER( ptm_o2_callback );
DECLARE_WRITE_LINE_MEMBER( ptm_o3_callback );
DECLARE_WRITE8_MEMBER(baud_rate_w);
protected:
virtual void machine_reset() override;
@ -72,6 +74,7 @@ private:
required_device<pia6821_device> m_pia1;
required_device<ptm6840_device> m_ptm;
required_device<speaker_sound_device> m_speaker;
required_device<clock_device> m_acia_clock;
required_shared_ptr<uint8_t> m_videoram;
uint8_t m_term_data;
};
@ -85,7 +88,7 @@ static ADDRESS_MAP_START(poly_mem, AS_PROGRAM, 8, poly_state)
AM_RANGE(0xe000,0xe003) AM_DEVREADWRITE("pia0", pia6821_device, read, write) //video control PIA 6821
AM_RANGE(0xe004,0xe004) AM_DEVREADWRITE("acia", acia6850_device, status_r, control_w)
AM_RANGE(0xe005,0xe005) AM_DEVREADWRITE("acia", acia6850_device, data_r, data_w)
//AM_RANGE(0xe006, 0xe006) // baud rate controller (0=9600,2=4800,4=2400,6=1200,8=600,A=300)
AM_RANGE(0xe006,0xe006) AM_WRITE(baud_rate_w)
AM_RANGE(0xe00c,0xe00f) AM_DEVREADWRITE("pia1", pia6821_device, read, write) //keyboard PIA 6821
AM_RANGE(0xe020,0xe027) AM_DEVREADWRITE("ptm", ptm6840_device, read, write) //timer 6840
AM_RANGE(0xe030,0xe037) AM_DEVREADWRITE("adlc", mc6854_device, read, write) //Data Link Controller 6854
@ -141,6 +144,13 @@ WRITE_LINE_MEMBER( poly_state::ptm_o3_callback )
m_speaker->level_w(state);
}
WRITE8_MEMBER(poly_state::baud_rate_w)
{
// baud rate controller (0=9600,2=4800,4=2400,6=1200,8=600,A=300)
int selector = (data & 0x0e) >> 1;
m_acia_clock->set_clock_scale((selector <= 5) ? 1.0 / (1 << selector) : 0.0);
}
static MACHINE_CONFIG_START( poly )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu", M6809E, XTAL_12MHz / 3) // 12.0576MHz
@ -184,9 +194,9 @@ static MACHINE_CONFIG_START( poly )
//MCFG_ACIA6850_TXD_HANDLER(DEVWRITELINE("rs232", rs232_port_device, write_txd))
//MCFG_ACIA6850_RTS_HANDLER(DEVWRITELINE("rs232", rs232_port_device, write_rts))
//MCFG_DEVICE_ADD("acia_clock", CLOCK, 153600)
//MCFG_CLOCK_SIGNAL_HANDLER(DEVWRITELINE("acia", acia6850_device, write_txc))
//MCFG_DEVCB_CHAIN_OUTPUT(DEVWRITELINE("acia", acia6850_device, write_rxc))
MCFG_DEVICE_ADD("acia_clock", CLOCK, 153600)
MCFG_CLOCK_SIGNAL_HANDLER(DEVWRITELINE("acia", acia6850_device, write_txc))
MCFG_DEVCB_CHAIN_OUTPUT(DEVWRITELINE("acia", acia6850_device, write_rxc))
MCFG_DEVICE_ADD("adlc", MC6854, 0)