// license:BSD-3-Clause
// copyright-holders:Robbbert
/******************************************************************************
Proteus III computer.
2015-10-02 Skeleton [Robbbert]
Chips:
6800 @ 894kHz
6850 (TTY keyboard interface)
6850 (Cassette interface)
6820 (PIA for Keyboard and video
6844 DMA
MC14411 baud rate generator
CRT96364 CRTC @1008kHz
There's an undumped 74S287 prom (M24) in the video section.
It converts ascii control codes into the crtc control codes
Schematic has lots of errors and omissions.
Like many systems of the time, the cassette is grossly over-complicated,
using 12 chips for a standard Kansas-city interface. Speed = 600 baud.
To use the serial keyboard, type in the command: PORT#1
and to go back to the parallel keyboard type in: PORT#0
The Basic seems rather buggy and does odd things from time to time.
bios 0 doesn't seem to have any way to backspace and type over
bios 0 is the only one to have the EDIT command, although no idea how
to use it.
bios 2 is from a compatible system called "Micro Systemes 1", from the
same company.
To Do:
- Cassette (coded but too unreliable to be considered working)
- Add support for k7 cassette files.
- Need software
- Need missing PROM, so that all the CRTC controls can be emulated
- Keyboard may have its own CPU etc, but no info available.
- Missing buttons: BYE, PANIC, SPEED, HERE-IS. Could be more.
- Should be able to type in some low-res graphics from the keyboard, not implemented.
******************************************************************************/
#include "emu.h"
#include "cpu/m6800/m6800.h"
#include "machine/6821pia.h"
#include "machine/6850acia.h"
#include "machine/clock.h"
#include "machine/keyboard.h"
#include "imagedev/cassette.h"
#include "sound/wave.h"
#include "bus/rs232/rs232.h"
class proteus3_state : public driver_device
{
public:
proteus3_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
, m_maincpu(*this, "maincpu")
, m_pia(*this, "pia")
, m_acia1(*this, "acia1")
, m_acia2(*this, "acia2")
, m_cass(*this, "cassette")
{ }
DECLARE_WRITE_LINE_MEMBER(ca2_w);
DECLARE_WRITE8_MEMBER(video_w);
DECLARE_WRITE8_MEMBER(kbd_put);
DECLARE_WRITE_LINE_MEMBER(acia1_txdata_w);
DECLARE_WRITE_LINE_MEMBER(acia1_clock_w);
DECLARE_WRITE_LINE_MEMBER(acia2_clock_w);
TIMER_DEVICE_CALLBACK_MEMBER(timer_c);
TIMER_DEVICE_CALLBACK_MEMBER(timer_p);
UINT32 screen_update_proteus3(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
private:
UINT8 m_video_data;
UINT8 m_flashcnt;
UINT16 m_curs_pos;
UINT8 *m_p_chargen;
UINT8 *m_p_videoram;
UINT8 m_cass_data[4];
bool m_cass_state;
bool m_cassold;
UINT8 m_clockcnt;
virtual void machine_reset() override;
required_device<cpu_device> m_maincpu;
required_device<pia6821_device> m_pia;
required_device<acia6850_device> m_acia1; // cassette uart
required_device<acia6850_device> m_acia2; // tty keyboard uart
required_device<cassette_image_device> m_cass;
};
/******************************************************************************
Address Maps
******************************************************************************/
static ADDRESS_MAP_START(proteus3_mem, AS_PROGRAM, 8, proteus3_state)
ADDRESS_MAP_UNMAP_HIGH
AM_RANGE(0x0000, 0x7fff) AM_RAM
AM_RANGE(0x8004, 0x8007) AM_DEVREADWRITE("pia", pia6821_device, read, write)
AM_RANGE(0x8008, 0x8008) AM_DEVREADWRITE("acia1", acia6850_device, status_r, control_w) // cassette
AM_RANGE(0x8009, 0x8009) AM_DEVREADWRITE("acia1", acia6850_device, data_r, data_w)
AM_RANGE(0x8010, 0x8010) AM_DEVREADWRITE("acia2", acia6850_device, status_r, control_w) // serial keyboard
AM_RANGE(0x8011, 0x8011) AM_DEVREADWRITE("acia2", acia6850_device, data_r, data_w) // never writes data
AM_RANGE(0xc000, 0xffff) AM_ROM
ADDRESS_MAP_END
/******************************************************************************
Input Ports
******************************************************************************/
static INPUT_PORTS_START(proteus3)
INPUT_PORTS_END
WRITE8_MEMBER( proteus3_state::kbd_put )
{
if (data == 0x08)
data = 0x0f; // take care of backspace (bios 1 and 2)
m_pia->portb_w(data);
m_pia->cb1_w(1);
m_pia->cb1_w(0);
}
WRITE_LINE_MEMBER( proteus3_state::acia2_clock_w )
{
m_acia2->write_txc(state);
m_acia2->write_rxc(state);
}
/******************************************************************************
Cassette
******************************************************************************/
TIMER_DEVICE_CALLBACK_MEMBER( proteus3_state::timer_c )
{
m_cass_data[3]++;
if (m_cass_state != m_cassold)
{
m_cass_data[3] = 0;
m_cassold = m_cass_state;
}
if (m_cass_state)
m_cass->output(BIT(m_cass_data[3], 0) ? -1.0 : +1.0); // 2400Hz
else
m_cass->output(BIT(m_cass_data[3], 1) ? -1.0 : +1.0); // 1200Hz
}
TIMER_DEVICE_CALLBACK_MEMBER( proteus3_state::timer_p )
{
/* cassette - turn 1200/2400Hz to a bit */
m_cass_data[1]++;
UINT8 cass_ws = (m_cass->input() > +0.01) ? 1 : 0;
if (cass_ws != m_cass_data[0])
{
m_cass_data[0] = cass_ws;
m_acia1->write_rxd((m_cass_data[1] < 12) ? 1 : 0);
m_cass_data[1] = 0;
}
}
WRITE_LINE_MEMBER( proteus3_state::acia1_txdata_w )
{
m_cass_state = state;
}
WRITE_LINE_MEMBER( proteus3_state::acia1_clock_w )
{
m_clockcnt++;
m_acia1->write_txc(BIT(m_clockcnt, 0)); // divide by 16 selected in the acia
if ((m_clockcnt & 0x0f) == 0x04)
m_acia1->write_rxc(BIT(m_clockcnt, 4)); // divide by 1 selected
}
/******************************************************************************
Video
******************************************************************************/
WRITE8_MEMBER( proteus3_state::video_w )
{
m_video_data = data;
}
WRITE_LINE_MEMBER( proteus3_state::ca2_w )
{
if (state)
{
switch(m_video_data)
{
case 0x0a: // Line Feed
if (m_curs_pos > 959) // on bottom line?
{
memmove(m_p_videoram, m_p_videoram+64, 960); // scroll
memset(m_p_videoram+960, 0x20, 64); // blank bottom line
}
else
m_curs_pos += 64;
break;
case 0x0d: // Carriage Return
m_curs_pos &= 0x3c0;
break;
case 0x0c: // CLS
m_curs_pos = 0; // home cursor
memset(m_p_videoram, 0x20, 1024); // clear screen
break;
case 0x0f: // Cursor Left
if (m_curs_pos)
m_curs_pos--;
break;
case 0x7f: // Erase character under cursor
m_p_videoram[m_curs_pos] = 0x20;
break;
default: // If a displayable character, show it
if ((m_video_data > 0x1f) && (m_video_data < 0x7f))
{
m_p_videoram[m_curs_pos] = m_video_data;
m_curs_pos++;
if (m_curs_pos > 1023) // have we run off the bottom?
{
m_curs_pos -= 64;
memmove(m_p_videoram, m_p_videoram+64, 960); // scroll
memset(m_p_videoram+960, 0x20, 64); // blank bottom line
}
}
}
}
}
UINT32 proteus3_state::screen_update_proteus3(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
UINT8 y,ra,chr,gfx;
UINT16 sy=0,ma=0,x;
m_flashcnt++;
for(y = 0; y < 16; y++ )
{
for (ra = 0; ra < 12; ra++)
{
UINT16 *p = &bitmap.pix16(sy++);
for (x = ma; x < ma + 64; x++)
{
gfx = 0;
if (ra < 8)
{
chr = m_p_videoram[x]; // get char in videoram
gfx = m_p_chargen[(chr<<3) | ra]; // get dot pattern in chargen
}
else
if ((ra == 9) && (m_curs_pos == x) && BIT(m_flashcnt, 4))
gfx = 0xff;
/* Display a scanline of a character */
*p++ = BIT(gfx, 0);
*p++ = BIT(gfx, 1);
*p++ = BIT(gfx, 2);
*p++ = BIT(gfx, 3);
*p++ = BIT(gfx, 4);
*p++ = BIT(gfx, 5);
*p++ = BIT(gfx, 6);
*p++ = BIT(gfx, 7);
}
}
ma+=64;
}
return 0;
}
/* F4 Character Displayer */
static const gfx_layout charlayout =
{
8, 8, /* 8 x 8 characters */
128, /* 128 characters */
1, /* 1 bits per pixel */
{ 0 }, /* no bitplanes */
/* x offsets */
{ 7, 6, 5, 4, 3, 2, 1, 0 },
/* y offsets */
{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8 },
8*8 /* every char takes 8 bytes */
};
static GFXDECODE_START( proteus3 )
GFXDECODE_ENTRY( "chargen", 0, charlayout, 0, 1 )
GFXDECODE_END
void proteus3_state::machine_reset()
{
m_p_chargen = memregion("chargen")->base();
m_p_videoram = memregion("vram")->base();
m_curs_pos = 0;
m_cass_data[0] = m_cass_data[1] = m_cass_data[2] = m_cass_data[3] = 0;
m_cass_state = 1;
m_cassold = 1;
m_acia1->write_rxd(1);
}
/******************************************************************************
Machine Drivers
******************************************************************************/
static MACHINE_CONFIG_START( proteus3, proteus3_state )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu", M6800, XTAL_3_579545MHz) /* Divided by 4 internally */
MCFG_CPU_PROGRAM_MAP(proteus3_mem)
/* video hardware */
MCFG_SCREEN_ADD("screen", RASTER)
MCFG_SCREEN_REFRESH_RATE(50)
MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(200))
MCFG_SCREEN_SIZE(64*8, 16*12)
MCFG_SCREEN_VISIBLE_AREA(0, 64*8-1, 0, 16*12-1)
MCFG_SCREEN_UPDATE_DRIVER(proteus3_state, screen_update_proteus3)
MCFG_SCREEN_PALETTE("palette")
MCFG_GFXDECODE_ADD("gfxdecode", "palette", proteus3)
MCFG_PALETTE_ADD_MONOCHROME("palette")
/* Devices */
MCFG_DEVICE_ADD("pia", PIA6821, 0)
MCFG_PIA_WRITEPA_HANDLER(WRITE8(proteus3_state, video_w))
MCFG_PIA_CA2_HANDLER(WRITELINE(proteus3_state, ca2_w))
MCFG_PIA_IRQB_HANDLER(DEVWRITELINE("maincpu", m6800_cpu_device, irq_line))
MCFG_DEVICE_ADD("keyboard", GENERIC_KEYBOARD, 0)
MCFG_GENERIC_KEYBOARD_CB(WRITE8(proteus3_state, kbd_put))
/* cassette */
MCFG_DEVICE_ADD ("acia1", ACIA6850, 0)
MCFG_ACIA6850_TXD_HANDLER(WRITELINE(proteus3_state, acia1_txdata_w))
MCFG_DEVICE_ADD("acia1_clock", CLOCK, 9600) // this controls cassette baud rate
MCFG_CLOCK_SIGNAL_HANDLER(WRITELINE(proteus3_state, acia1_clock_w))
MCFG_CASSETTE_ADD("cassette")
MCFG_CASSETTE_DEFAULT_STATE(CASSETTE_PLAY | CASSETTE_MOTOR_ENABLED | CASSETTE_SPEAKER_ENABLED)
MCFG_SPEAKER_STANDARD_MONO("mono")
MCFG_SOUND_WAVE_ADD(WAVE_TAG, "cassette")
MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25)
MCFG_TIMER_DRIVER_ADD_PERIODIC("timer_c", proteus3_state, timer_c, attotime::from_hz(4800))
MCFG_TIMER_DRIVER_ADD_PERIODIC("timer_p", proteus3_state, timer_p, attotime::from_hz(40000))
// optional tty keyboard
MCFG_DEVICE_ADD ("acia2", ACIA6850, 0)
MCFG_ACIA6850_TXD_HANDLER(DEVWRITELINE("rs232", rs232_port_device, write_txd))
MCFG_ACIA6850_RTS_HANDLER(DEVWRITELINE("rs232", rs232_port_device, write_rts))
MCFG_RS232_PORT_ADD("rs232", default_rs232_devices, "keyboard")
MCFG_RS232_RXD_HANDLER(DEVWRITELINE("acia2", acia6850_device, write_rxd))
MCFG_RS232_CTS_HANDLER(DEVWRITELINE("acia2", acia6850_device, write_cts))
MCFG_DEVICE_ADD("acia2_clock", CLOCK, 153600/8)
MCFG_CLOCK_SIGNAL_HANDLER(WRITELINE(proteus3_state, acia2_clock_w))
MACHINE_CONFIG_END
/******************************************************************************
ROM Definitions
******************************************************************************/
ROM_START(proteus3)
ROM_REGION(0x10000, "maincpu", 0)
ROM_SYSTEM_BIOS( 0, "14k", "14k BASIC")
ROMX_LOAD( "bas1.bin", 0xc800, 0x0800, CRC(016bf2d6) SHA1(89605dbede3b6fd101ee0548e5c545a0824fcfd3), ROM_BIOS(1) )
ROMX_LOAD( "bas2.bin", 0xd000, 0x0800, CRC(39d3e543) SHA1(dd0fe220e3c2a48ce84936301311cbe9f1597ca7), ROM_BIOS(1) )
ROMX_LOAD( "bas3.bin", 0xd800, 0x0800, CRC(3a41617d) SHA1(175406f4732389e226bc50d27ada39e6ea48de34), ROM_BIOS(1) )
ROMX_LOAD( "bas4.bin", 0xe000, 0x0800, CRC(ee9d77ee) SHA1(f7e60a1ab88a3accc8ffdc545657c071934d09d2), ROM_BIOS(1) )
ROMX_LOAD( "bas5.bin", 0xe800, 0x0800, CRC(bd81bb34) SHA1(6325735e5750a9536e63b67048f74711fae1fa42), ROM_BIOS(1) )
ROMX_LOAD( "bas6.bin", 0xf000, 0x0800, CRC(60cd006b) SHA1(28354f78490da1eb5116cbbc43eaca0670f7f398), ROM_BIOS(1) )
ROMX_LOAD( "bas7.bin", 0xf800, 0x0800, CRC(84c3dc22) SHA1(8fddba61b5f0270ca2daef32ab5edfd60300c776), ROM_BIOS(1) )
ROM_FILL( 0xc000, 1, 0x00 ) // if c000 isn't 0 it assumes a rom is there and jumps to it
ROM_SYSTEM_BIOS( 1, "8k", "8k BASIC")
ROMX_LOAD( "proteus3_basic8k.m0", 0xe000, 0x2000, CRC(7d9111c2) SHA1(3c032c9c7f87d22a1a9819b3b812be84404d2ad2), ROM_BIOS(2) )
ROM_RELOAD( 0xc000, 0x2000 )
ROM_SYSTEM_BIOS( 2, "8kms", "8k Micro-Systemes BASIC")
ROMX_LOAD( "ms1_basic8k.bin", 0xe000, 0x2000, CRC(b5476e28) SHA1(c8c2366d549b2645c740be4ab4237e05c3cab4a9), ROM_BIOS(3) )
ROM_RELOAD( 0xc000, 0x2000 )
ROM_REGION(0x400, "chargen", 0)
ROM_LOAD( "proteus3_font.m25", 0x0200, 0x0100, CRC(6a3a30a5) SHA1(ab39bf09722928483e497b87ac2dbd870828893b) )
ROM_CONTINUE( 0x100, 0x100 )
ROM_CONTINUE( 0x300, 0x100 )
ROM_CONTINUE( 0x000, 0x100 )
ROM_REGION(0x400, "vram", ROMREGION_ERASE00)
ROM_REGION(0x0800, "user1", 0) // roms not used yet
// Proteus III - pbug F800-FFFF, expects RAM at F000-F7FF
ROM_LOAD( "proteus3_pbug.bin", 0x0000, 0x0800, CRC(1118694d) SHA1(2dfc08d405e8f2936f5b0bd1c4007995151abbba) )
ROM_END
/******************************************************************************
Drivers
******************************************************************************/
/* YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS */
COMP( 1978, proteus3, 0, 0, proteus3, proteus3, driver_device, 0, "Proteus International", "Proteus III", MACHINE_NOT_WORKING | MACHINE_NO_SOUND_HW)