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[MESS] sdk80.c: Begun hooking up devices [MooglyGuy]

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* Hooked up i8251 USART and RS232 device. Can use standard RS232 slot devices,
    including the internal serial terminal, or a terminal program running on
    the host machine.
  * Hooked up USART baud rate selection switch.
This commit is contained in:
therealmogminer@gmail.com 2015-07-17 11:48:55 +02:00
parent 1b2b784b5c
commit b20988f0a3
1 changed files with 53 additions and 84 deletions
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137
src/mess/drivers/sdk80.c
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@ -1,5 +1,5 @@
// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
// copyright-holders:Nigel Barnes,Ryan Holtz
/***************************************************************************
Intel SDK-80
@ -24,14 +24,14 @@ Please note this rom set boots into BASIC, not monitor.
#include "emu.h"
#include "cpu/i8085/i8085.h"
//#include "machine/pit8253.h"
//#include "machine/i8251.h"
//#include "machine/i8255.h"
//#include "machine/i8279.h"
#include "machine/i8251.h"
#include "machine/clock.h"
#include "bus/rs232/rs232.h"
//#include "machine/ay31015.h"
//#include "bus/rs232/rs232.h"
#include "machine/terminal.h"
#define I8251A_TAG "usart"
#define I8251A_BAUD_TAG "usart_baud"
#define RS232_TAG "rs232"
class sdk80_state : public driver_device
{
@ -39,21 +39,25 @@ public:
sdk80_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
, m_maincpu(*this, "maincpu")
, m_terminal(*this, "terminal")
, m_usart(*this, I8251A_TAG)
, m_rs232(*this, RS232_TAG)
, m_usart_baud_rate(*this, I8251A_BAUD_TAG)
, m_usart_divide_counter(0)
, m_usart_clock_state(0)
{ }
DECLARE_WRITE8_MEMBER(scanlines_w);
DECLARE_WRITE8_MEMBER(digit_w);
DECLARE_READ8_MEMBER(kbd_r);
DECLARE_READ8_MEMBER(portec_r);
DECLARE_READ8_MEMBER(ported_r);
DECLARE_WRITE8_MEMBER(kbd_put);
UINT32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
DECLARE_WRITE_LINE_MEMBER( usart_clock_tick );
private:
UINT8 m_digit;
UINT8 m_term_data;
required_device<cpu_device> m_maincpu;
required_device<generic_terminal_device> m_terminal;
required_device<i8251_device> m_usart;
required_device<rs232_port_device> m_rs232;
required_ioport m_usart_baud_rate;
UINT8 m_usart_divide_counter;
UINT8 m_usart_clock_state;
};
static ADDRESS_MAP_START(sdk80_mem, AS_PROGRAM, 8, sdk80_state)
@ -65,27 +69,22 @@ ADDRESS_MAP_END
static ADDRESS_MAP_START(sdk80_io, AS_IO, 8, sdk80_state)
ADDRESS_MAP_UNMAP_HIGH
ADDRESS_MAP_GLOBAL_MASK(0xff)
AM_RANGE(0xec, 0xec) AM_READ(portec_r) AM_DEVWRITE("terminal", generic_terminal_device, write)
AM_RANGE(0xed, 0xed) AM_READ(ported_r)
//AM_RANGE(0xec, 0xec) AM_DEVREADWRITE("uart", i8251_device, data_r, data_w)
//AM_RANGE(0xed, 0xed) AM_DEVREADWRITE("uart", i8251_device, status_r, control_w)
AM_RANGE(0xec, 0xec) AM_DEVREADWRITE(I8251A_TAG, i8251_device, data_r, data_w)
AM_RANGE(0xed, 0xed) AM_DEVREADWRITE(I8251A_TAG, i8251_device, status_r, control_w)
ADDRESS_MAP_END
static INPUT_PORTS_START( sdk80 )
PORT_START(I8251A_BAUD_TAG)
PORT_DIPNAME( 0x3f, 0x01, "i8251 Baud Rate" )
PORT_DIPSETTING( 0x01, "4800")
PORT_DIPSETTING( 0x02, "2400")
PORT_DIPSETTING( 0x04, "1200")
PORT_DIPSETTING( 0x08, "600")
PORT_DIPSETTING( 0x10, "300")
PORT_DIPSETTING( 0x20, "150")
PORT_DIPSETTING( 0x40, "75")
INPUT_PORTS_END
READ8_MEMBER( sdk80_state::portec_r )
{
UINT8 ret = m_term_data;
m_term_data = 0;
return ret;
}
READ8_MEMBER( sdk80_state::ported_r )
{
return (m_term_data) ? 3 : 1;
}
#if 0
/* Graphics Output */
const gfx_layout sdk80_charlayout =
@ -111,67 +110,37 @@ UINT32 sdk80_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, c
return 0;
}
WRITE8_MEMBER( sdk80_state::scanlines_w )
WRITE_LINE_MEMBER( sdk80_state::usart_clock_tick )
{
m_digit = data;
}
UINT8 old_counter = m_usart_divide_counter;
m_usart_divide_counter++;
WRITE8_MEMBER( sdk80_state::digit_w )
{
if (m_digit < 6)
output_set_digit_value(m_digit, BITSWAP8(data, 3, 2, 1, 0, 7, 6, 5, 4)^0xff);
}
READ8_MEMBER( sdk80_state::kbd_r )
{
UINT8 data = 0xff;
if (m_digit < 3)
UINT8 transition = (old_counter ^ m_usart_divide_counter) & m_usart_baud_rate->read();
if (transition)
{
char kbdrow[6];
sprintf(kbdrow,"X%X",m_digit);
data = ioport(kbdrow)->read();
m_usart->write_txc(m_usart_clock_state);
m_usart->write_rxc(m_usart_clock_state);
m_usart_clock_state ^= 1;
}
return data;
}
WRITE8_MEMBER( sdk80_state::kbd_put )
{
m_term_data = data;
}
static MACHINE_CONFIG_START( sdk80, sdk80_state )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu", I8080A, 500000)
MCFG_CPU_ADD("maincpu", I8080A, XTAL_18_432MHz/9)
MCFG_CPU_PROGRAM_MAP(sdk80_mem)
MCFG_CPU_IO_MAP(sdk80_io)
// MCFG_DEVICE_ADD("uart", I8251, 0)
// MCFG_I8251_TXD_HANDLER(DEVWRITELINE("rs232", rs232_port_device, write_txd))
// MCFG_I8251_DTR_HANDLER(DEVWRITELINE("rs232", rs232_port_device, write_dtr))
// MCFG_I8251_RTS_HANDLER(DEVWRITELINE("rs232", rs232_port_device, write_rts))
MCFG_DEVICE_ADD(I8251A_TAG, I8251, 0)
MCFG_I8251_TXD_HANDLER(DEVWRITELINE(RS232_TAG, rs232_port_device, write_txd))
MCFG_I8251_DTR_HANDLER(DEVWRITELINE(RS232_TAG, rs232_port_device, write_dtr))
MCFG_I8251_RTS_HANDLER(DEVWRITELINE(RS232_TAG, rs232_port_device, write_rts))
// MCFG_RS232_PORT_ADD("rs232", default_rs232_devices, "terminal")
// MCFG_RS232_RXD_HANDLER(DEVWRITELINE("uart", i8251_device, write_rxd))
// MCFG_RS232_DSR_HANDLER(DEVWRITELINE("uart", i8251_device, write_dsr))
MCFG_RS232_PORT_ADD(RS232_TAG, default_rs232_devices, "null_modem")
MCFG_RS232_RXD_HANDLER(DEVWRITELINE(I8251A_TAG, i8251_device, write_rxd))
MCFG_RS232_DSR_HANDLER(DEVWRITELINE(I8251A_TAG, i8251_device, write_dsr))
// old references to other drivers have been left in
// MCFG_DEVICE_ADD("pit8253", PIT8253, 0)
// MCFG_PIT8253_CLK0(MAIN_CLOCK_X1) /* heartbeat IRQ */
// MCFG_PIT8253_OUT0_HANDLER(DEVWRITELINE("pic8259_master", pic8259_device, ir0_w))
// MCFG_PIT8253_CLK1(MAIN_CLOCK_X1) /* Memory Refresh */
// MCFG_PIT8253_CLK2(MAIN_CLOCK_X1) /* RS-232c */
// MCFG_PIT8253_OUT2_HANDLER(WRITELINE(pc9801_state, write_uart_clock))
// MCFG_DEVICE_ADD("ppi8255_sys", I8255, 0)
// MCFG_I8255_IN_PORTA_CB(IOPORT("DSW2"))
// MCFG_I8255_IN_PORTB_CB(IOPORT("DSW1"))
// MCFG_I8255_IN_PORTC_CB(CONSTANT(0xa0)) // 0x80 cpu triple fault reset flag?
// MCFG_I8255_OUT_PORTC_CB(WRITE8(pc9801_state, ppi_sys_portc_w))
// MCFG_DEVICE_ADD("ppi8255_prn", I8255, 0)
/* TODO: check this one */
// MCFG_I8255_IN_PORTB_CB(IOPORT("DSW5"))
MCFG_DEVICE_ADD("usart_clock", CLOCK, XTAL_18_432MHz/60)
MCFG_CLOCK_SIGNAL_HANDLER(WRITELINE(sdk80_state, usart_clock_tick))
/* video hardware */
// 96364 crt controller
@ -195,7 +164,7 @@ static MACHINE_CONFIG_START( sdk80, sdk80_state )
// MCFG_PALETTE_ADD_BLACK_AND_WHITE("palette")
// uart
// Video board UART
// MCFG_DEVICE_ADD( "hd6402", AY31015, 0 )
// MCFG_AY31015_TX_CLOCK(( XTAL_16MHz / 16 ) / 256)
// MCFG_AY31015_RX_CLOCK(( XTAL_16MHz / 16 ) / 256)
@ -211,8 +180,8 @@ static MACHINE_CONFIG_START( sdk80, sdk80_state )
// MCFG_I8279_IN_SHIFT_CB(VCC) // Shift key
// MCFG_I8279_IN_CTRL_CB(VCC)
MCFG_DEVICE_ADD("terminal", GENERIC_TERMINAL, 0)
MCFG_GENERIC_TERMINAL_KEYBOARD_CB(WRITE8(sdk80_state, kbd_put))
//MCFG_DEVICE_ADD("terminal", GENERIC_TERMINAL, 0)
//MCFG_GENERIC_TERMINAL_KEYBOARD_CB(WRITE8(sdk80_state, kbd_put))
MACHINE_CONFIG_END
/* ROM definition */