// license:BSD-3-Clause
// copyright-holders:Nigel Barnes,Ryan Holtz
/***************************************************************************
Intel SDK-80
The 8080 System Design Kit (SDK-80) is a complete microcomputer system in
kit form, and provides a excellent prototype vehicle for evaluation of the
8080 microcomputer system (MCS-80).
An extensive system monitor is included in a pre-programmed ROM for general
software utilities and system diagnostics.
Download the User Manual to get the operating procedures.
Monitor Commands:
D<low address>,<high address> Display memory contents
G<entry point> Go to address (execute program at address)
I<address> Insert instructions into RAM
M<low address>,<high address>,<destination> Move blocks of memory
S<address> Substitute memory locations
X<register identifier> Examine and modify registers
****************************************************************************/
#include "emu.h"
#include "cpu/i8085/i8085.h"
#include "machine/i8255.h"
#include "machine/i8251.h"
#include "machine/clock.h"
#include "bus/rs232/rs232.h"
#define I8255A_0_TAG "ppi8255_0"
#define I8255A_1_TAG "ppi8255_1"
#define I8251A_TAG "usart"
#define I8251A_BAUD_TAG "usart_baud"
#define RS232_TAG "rs232"
class sdk80_state : public driver_device
{
public:
sdk80_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
, m_maincpu(*this, "maincpu")
, m_usart(*this, I8251A_TAG)
, m_ppi_0(*this, I8255A_0_TAG)
, m_ppi_1(*this, I8255A_1_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_WRITE_LINE_MEMBER( usart_clock_tick );
private:
required_device<cpu_device> m_maincpu;
required_device<i8251_device> m_usart;
required_device<i8255_device> m_ppi_0;
required_device<i8255_device> m_ppi_1;
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)
ADDRESS_MAP_UNMAP_HIGH
AM_RANGE(0x0000, 0x0fff) AM_ROM
AM_RANGE(0x1000, 0x13ff) AM_RAM
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, 0xef) AM_DEVREADWRITE(I8255A_1_TAG, i8255_device, read, write)
AM_RANGE(0xf4, 0xf7) AM_DEVREADWRITE(I8255A_0_TAG, i8255_device, read, write)
AM_RANGE(0xfa, 0xfa) AM_DEVREADWRITE(I8251A_TAG, i8251_device, data_r, data_w)
AM_RANGE(0xfb, 0xfb) 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
WRITE_LINE_MEMBER( sdk80_state::usart_clock_tick )
{
UINT8 old_counter = m_usart_divide_counter;
m_usart_divide_counter++;
UINT8 transition = (old_counter ^ m_usart_divide_counter) & m_usart_baud_rate->read();
if (transition)
{
m_usart->write_txc(m_usart_clock_state);
m_usart->write_rxc(m_usart_clock_state);
m_usart_clock_state ^= 1;
}
}
static DEVICE_INPUT_DEFAULTS_START( terminal ) // set up terminal to default to 4800
DEVICE_INPUT_DEFAULTS( "RS232_RXBAUD", 0xff, RS232_BAUD_4800 )
DEVICE_INPUT_DEFAULTS( "RS232_TXBAUD", 0xff, RS232_BAUD_4800 )
DEVICE_INPUT_DEFAULTS( "RS232_STARTBITS", 0xff, RS232_STARTBITS_1 )
DEVICE_INPUT_DEFAULTS( "RS232_DATABITS", 0xff, RS232_DATABITS_8 )
DEVICE_INPUT_DEFAULTS( "RS232_PARITY", 0xff, RS232_PARITY_NONE )
DEVICE_INPUT_DEFAULTS( "RS232_STOPBITS", 0xff, RS232_STOPBITS_1 )
DEVICE_INPUT_DEFAULTS_END
static MACHINE_CONFIG_START( sdk80, sdk80_state )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu", I8080A, XTAL_18_432MHz/9)
MCFG_CPU_PROGRAM_MAP(sdk80_mem)
MCFG_CPU_IO_MAP(sdk80_io)
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_DEVICE_ADD(I8255A_0_TAG, I8255A, 0)
MCFG_DEVICE_ADD(I8255A_1_TAG, I8255A, 0)
MCFG_RS232_PORT_ADD(RS232_TAG, default_rs232_devices, "terminal")
MCFG_RS232_RXD_HANDLER(DEVWRITELINE(I8251A_TAG, i8251_device, write_rxd))
MCFG_RS232_DSR_HANDLER(DEVWRITELINE(I8251A_TAG, i8251_device, write_dsr))
MCFG_RS232_CTS_HANDLER(DEVWRITELINE(I8251A_TAG, i8251_device, write_cts))
MCFG_DEVICE_CARD_DEVICE_INPUT_DEFAULTS("terminal", terminal)
MCFG_DEVICE_ADD("usart_clock", CLOCK, XTAL_18_432MHz/60)
MCFG_CLOCK_SIGNAL_HANDLER(WRITELINE(sdk80_state, usart_clock_tick))
MACHINE_CONFIG_END
/* ROM definition */
ROM_START( sdk80 )
ROM_REGION( 0x01400, "maincpu", ROMREGION_ERASEFF )
ROM_LOAD( "mcs80.a14", 0x0000, 0x0400, BAD_DUMP CRC(3ce7bd37) SHA1(04cc67875b53d4cdfefce07041af12be3acedf4f)) // Compiled from manual listing
ROM_END
/* YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS */
COMP( 1975, sdk80, 0, 0, sdk80, sdk80, driver_device, 0, "Intel", "SDK-80", MACHINE_NO_SOUND_HW )