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Updated Apricot PC centronics from the schematic (nw)

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This commit is contained in:
smf- 2014-02-10 13:00:38 +00:00
parent 9644939bf7
commit 7ff41e74da
1 changed files with 36 additions and 21 deletions
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57
src/mess/drivers/apricot.c
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@ -47,7 +47,6 @@ public:
m_sio(*this, "ic15"),
m_rs232(*this, "rs232"),
m_centronics(*this, "centronics"),
m_cent_data_out(*this, "cent_data_out"),
m_fdc(*this, "ic68"),
m_floppy0(*this, "ic68:0"),
m_floppy1(*this, "ic68:1"),
@ -70,7 +69,6 @@ public:
required_device<z80sio0_device> m_sio;
required_device<rs232_port_device> m_rs232;
required_device<centronics_device> m_centronics;
required_device<output_latch_device> m_cent_data_out;
required_device<wd2793_t> m_fdc;
required_device<floppy_connector> m_floppy0;
required_device<floppy_connector> m_floppy1;
@ -79,14 +77,16 @@ public:
DECLARE_WRITE8_MEMBER( i8089_ca1_w );
DECLARE_WRITE8_MEMBER( i8089_ca2_w );
DECLARE_READ8_MEMBER( apricot_sysctrl_r );
DECLARE_WRITE8_MEMBER( apricot_sysctrl_w );
DECLARE_WRITE8_MEMBER( i8255_portb_w );
DECLARE_READ8_MEMBER( i8255_portc_r );
DECLARE_WRITE8_MEMBER( i8255_portc_w );
DECLARE_WRITE_LINE_MEMBER( timer_out1 );
DECLARE_WRITE_LINE_MEMBER( timer_out2 );
void wd2793_intrq_w(bool state);
void wd2793_drq_w(bool state);
DECLARE_WRITE8_MEMBER( centronics_write );
DECLARE_WRITE_LINE_MEMBER( write_centronics_fault );
DECLARE_WRITE_LINE_MEMBER( write_centronics_perror );
DECLARE_WRITE_LINE_MEMBER( apricot_mc6845_de ) { m_display_enabled = state; };
@ -106,6 +106,9 @@ public:
int m_display_enabled;
UINT32 screen_update_apricot(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
int m_centronics_fault;
int m_centronics_perror;
};
@ -127,16 +130,31 @@ WRITE8_MEMBER( apricot_state::i8089_ca2_w )
m_iop->ca_w(0);
}
READ8_MEMBER( apricot_state::apricot_sysctrl_r )
WRITE_LINE_MEMBER( apricot_state::write_centronics_fault )
{
m_centronics_fault = state;
m_sio->syncb_w(state);
m_ppi->pc2_w(state);
}
WRITE_LINE_MEMBER( apricot_state::write_centronics_perror )
{
m_centronics_perror = state;
}
READ8_MEMBER( apricot_state::i8255_portc_r )
{
UINT8 data = 0;
data |= m_centronics_perror << 0;
// schematic page 294 says pc1 is centronics pin 34, which is n/c.
data |= m_centronics_fault << 2;
data |= m_display_enabled << 3;
return data;
}
WRITE8_MEMBER( apricot_state::apricot_sysctrl_w )
WRITE8_MEMBER( apricot_state::i8255_portb_w )
{
m_display_on = BIT(data, 3);
m_video_mode = BIT(data, 4);
@ -151,23 +169,21 @@ WRITE8_MEMBER( apricot_state::apricot_sysctrl_w )
// PB7 Centronics transceiver direction. 0 = output, 1 = input
}
WRITE8_MEMBER( apricot_state::centronics_write )
WRITE8_MEMBER( apricot_state::i8255_portc_w )
{
m_cent_data_out->write(space, 0, data);
/// HACK: This is impossible, strobe might be connected to one of i8255 Port C output bits (4/5/6/7)
m_centronics->write_strobe(0);
m_centronics->write_strobe(1);
// schematic page 294 says pc4 outputs to centronics pin 13, which is the "select" output from the printer.
m_centronics->write_strobe(BIT(data, 5));
// schematic page 294 says pc6 outputs to centronics pin 15, which is unused
}
static const i8255_interface apricot_i8255a_intf =
{
DEVCB_DEVICE_MEMBER("cent_data_in", input_buffer_device, read),
DEVCB_DRIVER_MEMBER(apricot_state, centronics_write),
DEVCB_DEVICE_MEMBER("cent_data_out", output_latch_device, write),
DEVCB_NULL,
DEVCB_DRIVER_MEMBER(apricot_state, apricot_sysctrl_w),
DEVCB_DRIVER_MEMBER(apricot_state, apricot_sysctrl_r),
DEVCB_NULL
DEVCB_DRIVER_MEMBER(apricot_state, i8255_portb_w),
DEVCB_DRIVER_MEMBER(apricot_state, i8255_portc_r),
DEVCB_DRIVER_MEMBER(apricot_state, i8255_portc_w)
};
WRITE_LINE_MEMBER( apricot_state::timer_out1 )
@ -425,10 +441,9 @@ static MACHINE_CONFIG_START( apricot, apricot_state )
MCFG_CENTRONICS_DATA_INPUT_BUFFER("cent_data_in")
MCFG_CENTRONICS_ACK_HANDLER(DEVWRITELINE("ic15", z80dart_device, ctsb_w))
MCFG_CENTRONICS_BUSY_HANDLER(DEVWRITELINE("ic15", z80dart_device, dcdb_w))
MCFG_CENTRONICS_FAULT_HANDLER(DEVWRITELINE("ic15", z80dart_device, syncb_w))
// TODO: these might be connected to i8255 Port C input bits (0/1/2)
//MCFG_CENTRONICS_SELECT_HANDLER()
//MCFG_CENTRONICS_PERROR_HANDLER()
MCFG_CENTRONICS_FAULT_HANDLER(WRITELINE(apricot_state, write_centronics_fault))
MCFG_CENTRONICS_PERROR_HANDLER(WRITELINE(apricot_state, write_centronics_perror))
//MCFG_CENTRONICS_SELECT_HANDLER() // schematic page 294 says this is connected to pc4, but that is an output to the printer
MCFG_DEVICE_ADD("cent_data_in", INPUT_BUFFER, 0)
MCFG_CENTRONICS_OUTPUT_LATCH_ADD("cent_data_out", "centronics")