// license:BSD-3-Clause
// copyright-holders:Robbbert
/***************************************************************************
MCS BASIC 52 and MCS BASIC 31 board
03/12/2009 Skeleton driver.
2012-08-08 Made to work [Robbbert]
BASIC-52 is an official Intel release.
BASIC-31 (and variants) as found on the below url, are homebrews.
http://dsaprojects.110mb.com/electronics/8031-ah/8031-bas.html
The driver is working, however there are issues with the cpu serial code.
When started, you are supposed to press Space and the system works out
the baud rate and boots up.
However, the way the cpu is written, it actually passes bytes around, so
the auto-speed detection doesn't work as intended. Also the cpu interface
is horribly outdated and needs to be brought up to date.
So, as it stands, start the driver, then press d and g in turn until
something starts happening. Basic-52 usually starts at a very slow rate,
about 1 character per second, while Basic-31 is much faster.
Once the system starts, all input must be in uppercase. Read the manual
to discover the special features of this Basic.
****************************************************************************/
#include "emu.h"
#include "cpu/mcs51/mcs51.h"
#include "machine/i8255.h"
#include "machine/terminal.h"
#define TERMINAL_TAG "terminal"
class basic52_state : public driver_device
{
public:
basic52_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag),
m_maincpu(*this, "maincpu"),
m_terminal(*this, TERMINAL_TAG)
{
}
DECLARE_WRITE8_MEMBER(kbd_put);
DECLARE_READ8_MEMBER(unk_r);
UINT8 m_term_data;
required_device<mcs51_cpu_device> m_maincpu;
required_device<generic_terminal_device> m_terminal;
virtual void machine_reset() override;
DECLARE_WRITE8_MEMBER(to_term);
DECLARE_READ8_MEMBER(from_term);
};
static ADDRESS_MAP_START(basic52_mem, AS_PROGRAM, 8, basic52_state)
ADDRESS_MAP_UNMAP_HIGH
AM_RANGE(0x0000, 0x1fff) AM_ROM
AM_RANGE(0x2000, 0x7fff) AM_RAM
//AM_RANGE(0x8000, 0x9fff) AM_ROM // EPROM
//AM_RANGE(0xc000, 0xdfff) // Expansion block
//AM_RANGE(0xe000, 0xffff) // Expansion block
ADDRESS_MAP_END
static ADDRESS_MAP_START(basic52_io, AS_IO, 8, basic52_state)
ADDRESS_MAP_UNMAP_HIGH
AM_RANGE(0x0000, 0x7fff) AM_RAM
AM_RANGE(0x8000, 0x9fff) AM_ROM // EPROM
AM_RANGE(0xa000, 0xa003) AM_DEVREADWRITE("ppi8255", i8255_device, read, write) // PPI-8255
//AM_RANGE(0xc000, 0xdfff) // Expansion block
//AM_RANGE(0xe000, 0xffff) // Expansion block
AM_RANGE(0x20003, 0x20003) AM_READ(unk_r);
ADDRESS_MAP_END
/* Input ports */
static INPUT_PORTS_START( basic52 )
INPUT_PORTS_END
// won't compile unless these are static
WRITE8_MEMBER( basic52_state::to_term)
{
m_terminal->write(space, 0, data);
}
READ8_MEMBER(basic52_state::from_term)
{
return m_term_data;
}
READ8_MEMBER( basic52_state::unk_r)
{
return m_term_data; // won't boot without this
}
void basic52_state::machine_reset()
{
m_maincpu->i8051_set_serial_tx_callback(write8_delegate(FUNC(basic52_state::to_term),this));
m_maincpu->i8051_set_serial_rx_callback(read8_delegate(FUNC(basic52_state::from_term),this));
}
WRITE8_MEMBER( basic52_state::kbd_put )
{
m_maincpu->set_input_line(MCS51_RX_LINE, ASSERT_LINE);
m_maincpu->set_input_line(MCS51_RX_LINE, CLEAR_LINE);
m_term_data = data;
}
static MACHINE_CONFIG_START( basic31, basic52_state )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu", I8031, XTAL_11_0592MHz)
MCFG_CPU_PROGRAM_MAP(basic52_mem)
MCFG_CPU_IO_MAP(basic52_io)
/* video hardware */
MCFG_DEVICE_ADD(TERMINAL_TAG, GENERIC_TERMINAL, 0)
MCFG_GENERIC_TERMINAL_KEYBOARD_CB(WRITE8(basic52_state, kbd_put))
MCFG_DEVICE_ADD("ppi8255", I8255, 0)
MACHINE_CONFIG_END
static MACHINE_CONFIG_DERIVED( basic52, basic31 )
/* basic machine hardware */
MCFG_CPU_REPLACE("maincpu", I8052, XTAL_11_0592MHz)
MCFG_CPU_PROGRAM_MAP(basic52_mem)
MCFG_CPU_IO_MAP(basic52_io)
MACHINE_CONFIG_END
/* ROM definition */
ROM_START( basic52 )
ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
ROM_SYSTEM_BIOS(0, "v11", "v 1.1")
ROMX_LOAD( "mcs-51-11.bin", 0x0000, 0x2000, CRC(4157b22b) SHA1(bd9e6869b400cc1c9b163243be7bdcf16ce72789), ROM_BIOS(1))
ROM_SYSTEM_BIOS(1, "v11b", "v 1.1b")
ROMX_LOAD( "mcs-51-11b.bin", 0x0000, 0x2000, CRC(a60383cc) SHA1(9515cc435e2ca3d3adb19631c03a62dfbeab0826), ROM_BIOS(2))
ROM_SYSTEM_BIOS(2, "v131", "v 1.3.1")
ROMX_LOAD( "mcs-51-131.bin", 0x0000, 0x2000, CRC(6a493162) SHA1(ed1079a6b4d4dbf448e15238c5a9e4dd004e401c), ROM_BIOS(3))
ROM_END
ROM_START( basic31 )
ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
ROM_SYSTEM_BIOS(0, "v12", "v 1.2")
ROMX_LOAD( "mcs-51-12.bin", 0x0000, 0x2000, CRC(ee667c7c) SHA1(e69b32e69ecda2012c7113649634a3a64e984bed), ROM_BIOS(1))
ROM_SYSTEM_BIOS(1, "v12a", "v 1.2a")
ROMX_LOAD( "mcs-51-12a.bin", 0x0000, 0x2000, CRC(225bb2f0) SHA1(46e97643a7a5cb4c278f9e3c73d18cd93209f8bf), ROM_BIOS(2))
ROM_END
/* Driver */
/* YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS */
COMP( 1985, basic52, 0, 0, basic52, basic52, driver_device, 0, "Intel", "MCS BASIC 52", MACHINE_NO_SOUND_HW)
COMP( 1985, basic31, basic52, 0, basic31, basic52, driver_device, 0, "Intel", "MCS BASIC 31", MACHINE_NO_SOUND_HW)