// license:BSD-3-Clause
// copyright-holders:Miodrag Milanovic
/***************************************************************************
Microsystems International Limited MOD-8
M.I.L. was formed in 1968 from a joint venture between the Canadian
Government and Northern Telecom. It produced a variety of computer
chips, eproms, etc, plus parts for the telephone company. It folded
in 1975.
(Info from http://www.cse.yorku.ca/museum/v_tour/artifacts/artifacts.htm)
2009-11-18 Skeleton driver.
2009-12-02 Working driver [Miodrag Milanovic]
2011-06-14 Modernised & above notes added.
Commands:
All commands consist of 3 uppercase letters. If further info is required
then a * prompt is printed on a new line, where you will enter the data.
All numbers are OCTAL (3/6 digits with leading zeros). Since a teletypewriter
is being used, there is no cursor. Do NOT press Enter except after these
commands, otherwise things get confusing.
LOC - set current location pointer (the CLP)
DLP - display CLP
DPS - dump symbolic
LDO - load octal
DPO - dump octal
LBF - load BNPF format
DBF - dump BNPF format
EDT - enter Edit Mode
XQT - initiate program execution
CPY - copy routine
TRN - translate routine
SBP - set breakpoint
CBP - clear breakpoint
PRG - program PROM
Pressing Ctrl-A will escape back to the monitor. You will see 8 dashes.
Commands in the Edit Mode:
When you enter the Edit Mode it displays the CLP followed by a slash.
nnn - enter a new value into this memory location and increment the CLP
` (tic) - decrement CLP
@ - same as XQT
R - return to monitor
*nnnnnn - change CLP to this value
space - display current contents of memory
While in 'space' mode, press a letter to increment CLP, or shift-delete
(underscore character) followed by a new byte for this location.
****************************************************************************/
#include "emu.h"
#include "cpu/i8008/i8008.h"
#include "machine/teleprinter.h"
class mod8_state : public driver_device
{
public:
mod8_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
, m_teleprinter(*this, TELEPRINTER_TAG)
, m_maincpu(*this, "maincpu")
{ }
void mod8(machine_config &config);
private:
DECLARE_WRITE8_MEMBER(out_w);
DECLARE_WRITE8_MEMBER(tty_w);
void kbd_put(u8 data);
DECLARE_READ8_MEMBER(tty_r);
IRQ_CALLBACK_MEMBER(mod8_irq_callback);
void mod8_io(address_map &map);
void mod8_mem(address_map &map);
uint16_t m_tty_data;
uint8_t m_tty_key_data;
int m_tty_cnt;
virtual void machine_reset() override;
required_device<teleprinter_device> m_teleprinter;
required_device<cpu_device> m_maincpu;
};
WRITE8_MEMBER( mod8_state::out_w )
{
m_tty_data >>= 1;
m_tty_data |= BIT(data, 0) ? 0x8000 : 0;
m_tty_cnt++;
if (m_tty_cnt == 10)
{
m_teleprinter->write((m_tty_data >> 7) & 0x7f);
m_tty_cnt = 0;
}
}
WRITE8_MEMBER( mod8_state::tty_w )
{
m_tty_data = 0;
m_tty_cnt = 0;
}
READ8_MEMBER( mod8_state::tty_r )
{
uint8_t d = m_tty_key_data & 1;
m_tty_key_data >>= 1;
return d;
}
void mod8_state::mod8_mem(address_map &map)
{
map.unmap_value_high();
map(0x000, 0x6ff).rom();
map(0x700, 0xfff).ram();
}
void mod8_state::mod8_io(address_map &map)
{
map.unmap_value_high();
map(0x00, 0x00).r(FUNC(mod8_state::tty_r));
map(0x0a, 0x0a).w(FUNC(mod8_state::out_w));
map(0x0b, 0x0b).w(FUNC(mod8_state::tty_w));
}
/* Input ports */
static INPUT_PORTS_START( mod8 )
INPUT_PORTS_END
IRQ_CALLBACK_MEMBER(mod8_state::mod8_irq_callback)
{
return 0xC0; // LAA - NOP equivalent
}
void mod8_state::machine_reset()
{
}
void mod8_state::kbd_put(u8 data)
{
m_tty_key_data = data ^ 0xff;
m_maincpu->set_input_line(0, HOLD_LINE);
}
void mod8_state::mod8(machine_config &config)
{
/* basic machine hardware */
I8008(config, m_maincpu, 800000);
m_maincpu->set_addrmap(AS_PROGRAM, &mod8_state::mod8_mem);
m_maincpu->set_addrmap(AS_IO, &mod8_state::mod8_io);
m_maincpu->set_irq_acknowledge_callback(FUNC(mod8_state::mod8_irq_callback));
/* video hardware */
TELEPRINTER(config, m_teleprinter, 0);
m_teleprinter->set_keyboard_callback(FUNC(mod8_state::kbd_put));
}
/* ROM definition */
ROM_START( mod8 )
ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
ROM_LOAD( "mon8.001", 0x0000, 0x0100, CRC(b82ac6b8) SHA1(fbea5a6dd4c779ca1671d84089f857a3f548ffcb))
ROM_LOAD( "mon8.002", 0x0100, 0x0100, CRC(8b82bc3c) SHA1(66222511527b27e56a5a1f9656d424d407eac7d3))
ROM_LOAD( "mon8.003", 0x0200, 0x0100, CRC(679ae913) SHA1(22423efcb9051c9812fcbac9a27af70415d0dd81))
ROM_LOAD( "mon8.004", 0x0300, 0x0100, CRC(2a4e580f) SHA1(8b0cb9660fde3cacd299faaa31724e4f3262d77f))
ROM_LOAD( "mon8.005", 0x0400, 0x0100, CRC(e281bb1a) SHA1(cc7c2746e075512dbf5eed88ae3aea009558dbd0))
ROM_LOAD( "mon8.006", 0x0500, 0x0100, CRC(b7e2f585) SHA1(5408adabc3df6e6ea8dcfb2327b2883b435ab85e))
ROM_LOAD( "mon8.007", 0x0600, 0x0100, CRC(49a5c626) SHA1(66c1865db9151818d3b20ec3c68dd793cb98a221))
ROM_END
/* Driver */
// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS
COMP( 1974, mod8, 0, 0, mod8, mod8, mod8_state, empty_init, "Microsystems International Ltd", "MOD-8", MACHINE_NO_SOUND_HW )