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+// license:BSD-3-Clause
+// copyright-holders:Robbbert
+/***************************************************************************
+
+ Processor Technology Corp. SOL-20
+
+ 07/2009 Skeleton driver.
+
+ Info from: http://www.sol20.org/
+
+ The Sol Terminal Computer was the first complete S-100 microcomputer
+ with a built-in keyboard and video output. However, its internal
+ architecture resembles a video display terminal more than anything else.
+
+ Note that the SOLOS dump comes from the Solace emu. Confirmed as ok.
+
+ The roms DPMON and CONSOL are widely available on the net as ENT files,
+ which can be loaded into memory with the Paste option, then exported to
+ binary files with the debugger. They are working, however the ENT files
+ do not indicate the values of unused rom space. Therefore they are marked
+ as BAD_DUMP.
+
+ Note that the CONSOL rom is basically a dumb terminal program and doesn't
+ do anything useful unless the MODE key (whatever that is) is pressed.
+
+ CUTER is a relocatable cassette-based alternative to SOLOS. According
+ to the manual, it should work if the sense switches are set to on. But,
+ it continuously reads port 00 and does nothing.
+
+ Need original dumps of all roms.
+
+ The character roms are built by a script from the Solace source, then the
+ characters moved back to the original 7x9 matrix positions, as shown in
+ the manual. Although they look exactly the same, I've marked them as
+ BAD_DUMP until properly verified.
+
+ Other roms needed:
+ - Dump of U18 in the keyboard
+
+ Hardware variants (ever shipped?):
+ - SOL-10, i.e. a stripped down version without expansion backplane and
+ numeric keypad
+ - SOL-PC, i.e. the single board version, basically it consisted of the
+ SOL-20 board only
+
+ Similarity to Exidy Sorcerer:
+ - Some hardware is the same design (parallel ports, serial ports, 2
+ tape players, the cassette circuits)
+ - The cassette format is totally identical, in fact tapes from one
+ machine can be loaded on the other natively. They won't run of course.
+ - Sorcerer monitor commands are almost identical to the SOLOS ones.
+ example: to change tape speed to 300 baud:
+ SE T=1 (sorcerer) SE TA 1 (SOLOS)
+ Most other commands are identical. The EN command (enter bytes into
+ memory) is rather primitive in SOLOS, better on Sorcerer.
+ - Sol20 has "personality modules" where you could plug a new OS into
+ a special socket on the motherboard. Sorcerer improved upon this by
+ being the first computer to use cartridges.
+ - Some circuits are completely different... the video and keyboard are
+ notable examples, while the addresses of ram and bios on the basic
+ machines is another major difference.
+
+ ToDo:
+ - connect up half/full duplex dipswitch function
+ - connect up the remaining functions of port FE
+ - keyboard (using terminal keyboard for now)
+ - optional floppy disk support and CP/M
+ - parallel i/o and handshake lines
+ - connect serial i/o to something
+ - support for loading the various file formats
+
+ File Formats:
+ - Most files are simple ascii which can be loaded via the Paste handler.
+ These are ASC, ENT, BAS, ROM, BS5 and ECB. Most files require that the
+ correct version of BASIC be loaded first. Paste works, but it is very
+ very slow. Perhaps we need something faster such as what Solace has.
+ - SVT (Solace Virtual Tape) files are a representation of a cassette,
+ usually holding about 4 games, just like a multifile tape. This format
+ is partially supported.
+ - HEX files appear to be the standard Intel format, and can be loaded
+ by Solace.
+ - The remaining formats (OPN, PL, PRN, SMU, SOL, ASM and LIB) appear
+ at first glance to be more specialised, and probably not worth being
+ supported.
+
+ System Setup (to play games etc).
+ - In the Dipswitches (not the Configuration), turn cursor flashing OFF.
+ - Loading via wav files works, so load a tape image in the file manager
+ - In UPPER CASE, enter XE press enter, cassette will load.
+ - At the end, the program will start by itself.
+ - When it says use 2,4,6,8 keys, you can use the keyboard arrow keys.
+
+ Monitor Commands:
+ - TE - return to terminal mode
+ - DU - dump memory
+ - EN - modify memory
+ - EX - Go (execute)
+ - CU - Insert or remove a custom command
+ - SE - Set parameters (eg tape speed)
+ - SA - Save
+ - GE - Load
+ - XE - Load and run
+ - CA - List the files on a tape
+
+ How to use the music system:
+ 1. Choose the "music" item from the software list
+ 2. Type XEQ press Enter
+ 3. When the program starts, press R, you are back in the monitor
+ 4. Type GET press Enter
+ 5. When this finishes loading, type EX 0 press Enter, there's no response
+ 6. Press F, wait for numbers to appear
+ 7. Press S, wait for numbers to appear
+ 8. Press P, music will be heard (it isn't very loud)
+
+****************************************************************************/
+
+#include "emu.h"
+
+#include "cpu/i8085/i8085.h"
+#include "bus/rs232/rs232.h"
+//#include "bus/s100/s100.h"
+#include "imagedev/cassette.h"
+#include "machine/ay31015.h"
+#include "machine/clock.h"
+#include "machine/keyboard.h"
+#include "sound/spkrdev.h"
+
+#include "emupal.h"
+#include "screen.h"
+#include "softlist_dev.h"
+#include "speaker.h"
+
+#include "formats/sol_cas.h"
+
+
+namespace {
+
+class sol20_state : public driver_device
+{
+public:
+ sol20_state(const machine_config &mconfig, device_type type, const char *tag)
+ : driver_device(mconfig, type, tag)
+ , m_maincpu(*this, "maincpu")
+ , m_rom(*this, "maincpu")
+ , m_ram(*this, "mainram")
+ , m_screen(*this, "screen")
+ , m_cass1(*this, "cassette")
+ , m_cass2(*this, "cassette2")
+ , m_uart(*this, "uart")
+ , m_uart_s(*this, "uart_s")
+ , m_uart_clock(*this, "uart_clock")
+ , m_uart_s_clock(*this, "uart_s_clock")
+ , m_rs232(*this, "rs232")
+ , m_vram(*this, "videoram")
+ , m_p_chargen(*this, "chargen")
+ , m_iop_arrows(*this, "ARROWS")
+ , m_iop_config(*this, "CONFIG")
+ , m_iop_s1(*this, "S1")
+ , m_iop_s2(*this, "S2")
+ , m_iop_s3(*this, "S3")
+ , m_iop_s4(*this, "S4")
+ { }
+
+ void sol20(machine_config &config);
+
+private:
+ virtual void machine_start() override ATTR_COLD;
+ virtual void machine_reset() override ATTR_COLD;
+
+ void mem_map(address_map &map) ATTR_COLD;
+ void io_map(address_map &map) ATTR_COLD;
+
+ struct cass_data_t
+ {
+ struct
+ {
+ int length = 0; /* time cassette level is at input.level */
+ int level = 0; /* cassette level */
+ int bit = 0; /* bit being read */
+ } input;
+ struct
+ {
+ int length = 0; /* time cassette level is at output.level */
+ int level = 0; /* cassette level */
+ int bit = 0; /* bit to output */
+ } output;
+ };
+
+ u8 sol20_f8_r();
+ u8 sol20_fa_r();
+ u8 sol20_fc_r();
+ u8 sol20_fd_r();
+ void sol20_f8_w(u8 data);
+ void sol20_fa_w(u8 data);
+ void sol20_fd_w(u8 data);
+ void sol20_fe_w(u8 data);
+ void kbd_put(u8 data);
+ TIMER_CALLBACK_MEMBER(sol20_cassette_tc);
+ u32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
+
+ u8 m_sol20_fa = 0U;
+ u8 m_sol20_fc = 0U;
+ u8 m_sol20_fe = 0U;
+ u8 m_framecnt = 0U;
+ cass_data_t m_cass_data;
+ emu_timer *m_cassette_timer = nullptr;
+ cassette_image_device *cassette_device_image();
+ memory_passthrough_handler m_rom_shadow_tap;
+ required_device<i8080a_cpu_device> m_maincpu;
+ required_region_ptr<u8> m_rom;
+ required_shared_ptr<u8> m_ram;
+ required_device<screen_device> m_screen;
+ required_device<cassette_image_device> m_cass1;
+ required_device<cassette_image_device> m_cass2;
+ required_device<ay31015_device> m_uart;
+ required_device<ay31015_device> m_uart_s;
+ required_device<clock_device> m_uart_clock;
+ required_device<clock_device> m_uart_s_clock;
+ required_device<rs232_port_device> m_rs232;
+ required_shared_ptr<u8> m_vram;
+ required_region_ptr<u8> m_p_chargen;
+ required_ioport m_iop_arrows;
+ required_ioport m_iop_config;
+ required_ioport m_iop_s1;
+ required_ioport m_iop_s2;
+ required_ioport m_iop_s3;
+ required_ioport m_iop_s4;
+};
+
+
+/* timer to read cassette waveforms */
+
+
+cassette_image_device *sol20_state::cassette_device_image()
+{
+ if (m_sol20_fa & 0x40)
+ return m_cass2;
+ else
+ return m_cass1;
+}
+
+
+// identical to sorcerer
+TIMER_CALLBACK_MEMBER(sol20_state::sol20_cassette_tc)
+{
+ u8 cass_ws = 0;
+ switch (m_sol20_fa & 0x20)
+ {
+ case 0x20: /* Cassette 300 baud */
+
+ /* loading a tape - this is basically the same as the super80.
+ We convert the 1200/2400 Hz signal to a 0 or 1, and send it to the uart. */
+
+ m_cass_data.input.length++;
+
+ cass_ws = ((cassette_device_image())->input() > +0.02) ? 1 : 0;
+
+ if (cass_ws != m_cass_data.input.level)
+ {
+ m_cass_data.input.level = cass_ws;
+ m_cass_data.input.bit = ((m_cass_data.input.length < 0x6) || (m_cass_data.input.length > 0x20)) ? 1 : 0;
+ m_cass_data.input.length = 0;
+ m_uart->write_si(m_cass_data.input.bit);
+ }
+
+ /* saving a tape - convert the serial stream from the uart, into 1200 and 2400 Hz frequencies.
+ Synchronisation of the frequency pulses to the uart is extremely important. */
+
+ m_cass_data.output.length++;
+ if (!(m_cass_data.output.length & 0x1f))
+ {
+ cass_ws = m_uart->so_r();
+ if (cass_ws != m_cass_data.output.bit)
+ {
+ m_cass_data.output.bit = cass_ws;
+ m_cass_data.output.length = 0;
+ }
+ }
+
+ if (!(m_cass_data.output.length & 3))
+ {
+ if (!((m_cass_data.output.bit == 0) && (m_cass_data.output.length & 4)))
+ {
+ m_cass_data.output.level ^= 1; // toggle output this, except on 2nd half of low bit
+ cassette_device_image()->output(m_cass_data.output.level ? -1.0 : +1.0);
+ }
+ }
+ return;
+
+ case 0x00: /* Cassette 1200 baud */
+ /* loading a tape */
+ m_cass_data.input.length++;
+
+ cass_ws = ((cassette_device_image())->input() > +0.02) ? 1 : 0;
+
+ if (cass_ws != m_cass_data.input.level || m_cass_data.input.length == 10)
+ {
+ m_cass_data.input.bit = ((m_cass_data.input.length < 10) || (m_cass_data.input.length > 0x20)) ? 1 : 0;
+ if ( cass_ws != m_cass_data.input.level )
+ {
+ m_cass_data.input.length = 0;
+ m_cass_data.input.level = cass_ws;
+ }
+ m_uart->write_si(m_cass_data.input.bit);
+ }
+
+ /* saving a tape - convert the serial stream from the uart, into 600 and 1200 Hz frequencies. */
+
+ m_cass_data.output.length++;
+ if (!(m_cass_data.output.length & 7))
+ {
+ cass_ws = m_uart->so_r();
+ if (cass_ws != m_cass_data.output.bit)
+ {
+ m_cass_data.output.bit = cass_ws;
+ m_cass_data.output.length = 0;
+ }
+ }
+
+ if (!(m_cass_data.output.length & 7))
+ {
+ if (!((m_cass_data.output.bit == 0) && (m_cass_data.output.length & 8)))
+ {
+ m_cass_data.output.level ^= 1; // toggle output this, except on 2nd half of low bit
+ cassette_device_image()->output(m_cass_data.output.level ? -1.0 : +1.0);
+ }
+ }
+ return;
+ }
+}
+
+u8 sol20_state::sol20_f8_r()
+{
+ // d7 - TBMT; d6 - DAV; d5 - CTS; d4 - OE; d3 - PE; d2 - FE; d1 - DSR; d0 - CD
+ u8 data = 0;
+
+ m_uart_s->write_swe(0);
+ data |= m_uart_s->tbmt_r() ? 0x80 : 0;
+ data |= m_uart_s->dav_r( ) ? 0x40 : 0;
+ data |= m_rs232->cts_r( ) ? 0x20 : 0;
+ data |= m_uart_s->or_r( ) ? 0x10 : 0;
+ data |= m_uart_s->pe_r( ) ? 0x08 : 0;
+ data |= m_uart_s->fe_r( ) ? 0x04 : 0;
+ data |= m_rs232->dsr_r( ) ? 0x02 : 0;
+ data |= m_rs232->dcd_r( ) ? 0x01 : 0;
+ m_uart_s->write_swe(1);
+
+ return data;
+}
+
+u8 sol20_state::sol20_fa_r()
+{
+ /* set unused bits high */
+ u8 data = 0x26;
+
+ m_uart->write_swe(0);
+ data |= m_uart->tbmt_r() ? 0x80 : 0;
+ data |= m_uart->dav_r( ) ? 0x40 : 0;
+ data |= m_uart->or_r( ) ? 0x10 : 0;
+ data |= m_uart->fe_r( ) ? 0x08 : 0;
+ m_uart->write_swe(1);
+
+ bool arrowkey = m_iop_arrows->read() ? 0 : 1;
+ bool keydown = m_sol20_fa & 1;
+
+ return data | (arrowkey & keydown);
+}
+
+u8 sol20_state::sol20_fc_r()
+{
+ u8 data = m_iop_arrows->read();
+ if (BIT(data, 0)) return 0x32;
+ if (BIT(data, 1)) return 0x34;
+ if (BIT(data, 2)) return 0x36;
+ if (BIT(data, 3)) return 0x38;
+
+ m_sol20_fa |= 1;
+ return m_sol20_fc;
+}
+
+u8 sol20_state::sol20_fd_r()
+{
+// Return a byte from parallel interface
+ return 0;
+}
+
+void sol20_state::sol20_f8_w(u8 data)
+{
+// The only function seems to be to send RTS from bit 4
+ m_rs232->write_rts(BIT(data, 4));
+}
+
+void sol20_state::sol20_fa_w(u8 data)
+{
+ m_sol20_fa &= 1;
+ m_sol20_fa |= (data & 0xf0);
+
+ /* cassette 1 motor */
+ m_cass1->change_state(
+ (BIT(data,7)) ? CASSETTE_MOTOR_ENABLED : CASSETTE_MOTOR_DISABLED, CASSETTE_MASK_MOTOR);
+
+ /* cassette 2 motor */
+ m_cass2->change_state(
+ (BIT(data,6)) ? CASSETTE_MOTOR_ENABLED : CASSETTE_MOTOR_DISABLED, CASSETTE_MASK_MOTOR);
+
+ if (data & 0xc0)
+ m_cassette_timer->adjust(attotime::zero, 0, attotime::from_hz(19200));
+ else
+ m_cassette_timer->adjust(attotime::zero);
+
+ // bit 5 baud rate */
+ m_uart_clock->set_unscaled_clock(BIT(data, 5) ? 4800 : 19200);
+}
+
+void sol20_state::sol20_fd_w(u8 data)
+{
+// Output a byte to parallel interface
+}
+
+void sol20_state::sol20_fe_w(u8 data)
+{
+ m_sol20_fe = data;
+}
+
+void sol20_state::mem_map(address_map &map)
+{
+ map(0x0000, 0xbfff).ram().share("mainram"); // optional s100 ram
+ map(0xc000, 0xc7ff).rom().region("maincpu", 0);
+ map(0xc800, 0xcbff).ram(); // system ram
+ map(0xcc00, 0xcfff).ram().share("videoram");
+ map(0xd000, 0xffff).ram(); // optional s100 ram
+}
+
+void sol20_state::io_map(address_map &map)
+{
+ map.unmap_value_high();
+ map.global_mask(0xff);
+ map(0xf8, 0xf8).rw(FUNC(sol20_state::sol20_f8_r), FUNC(sol20_state::sol20_f8_w));
+ map(0xf9, 0xf9).rw(m_uart_s, FUNC(ay51013_device::receive), FUNC(ay51013_device::transmit));
+ map(0xfa, 0xfa).rw(FUNC(sol20_state::sol20_fa_r), FUNC(sol20_state::sol20_fa_w));
+ map(0xfb, 0xfb).rw(m_uart, FUNC(ay51013_device::receive), FUNC(ay51013_device::transmit));
+ map(0xfc, 0xfc).r(FUNC(sol20_state::sol20_fc_r));
+ map(0xfd, 0xfd).rw(FUNC(sol20_state::sol20_fd_r), FUNC(sol20_state::sol20_fd_w));
+ map(0xfe, 0xfe).w(FUNC(sol20_state::sol20_fe_w));
+ map(0xff, 0xff).portr("S2");
+/* map(0xf8, 0xf8) serial status in (bit 6=data av, bit 7=tmbe)
+ map(0xf9, 0xf9) serial data in, out
+ map(0xfa, 0xfa) general status in (bit 0=keyb data av, bit 1=parin data av, bit 2=parout ready)
+ map(0xfb, 0xfb) tape
+ map(0xfc, 0xfc) keyboard data in
+ map(0xfd, 0xfd) parallel data in, out
+ map(0xfe, 0xfe) scroll register
+ map(0xff, 0xff) sense switches */
+}
+
+/* Input ports */
+static INPUT_PORTS_START( sol20 )
+ PORT_START("ARROWS")
+ PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYPAD ) PORT_CODE(KEYCODE_DOWN) PORT_CHAR(UCHAR_MAMEKEY(DOWN))
+ PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYPAD ) PORT_CODE(KEYCODE_LEFT) PORT_CHAR(UCHAR_MAMEKEY(LEFT))
+ PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYPAD ) PORT_CODE(KEYCODE_RIGHT) PORT_CHAR(UCHAR_MAMEKEY(RIGHT))
+ PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYPAD ) PORT_CODE(KEYCODE_UP) PORT_CHAR(UCHAR_MAMEKEY(UP))
+ PORT_BIT( 0xf0, IP_ACTIVE_HIGH, IPT_UNUSED)
+
+ PORT_START("S1")
+ PORT_DIPNAME( 0x04, 0x00, "Ctrl Chars")
+ PORT_DIPSETTING( 0x04, DEF_STR(Off))
+ PORT_DIPSETTING( 0x00, DEF_STR(On))
+ PORT_DIPNAME( 0x08, 0x00, "Polarity")
+ PORT_DIPSETTING( 0x00, DEF_STR( Normal ))
+ PORT_DIPSETTING( 0x08, "Inverse")
+ PORT_DIPNAME( 0x30, 0x10, "Cursor Type")
+ PORT_DIPSETTING( 0x10, "Blinking")
+ PORT_DIPSETTING( 0x20, "Solid")
+ PORT_DIPSETTING( 0x30, DEF_STR(None))
+
+ PORT_START("S2") // Sense Switches
+ PORT_DIPNAME( 0x01, 0x01, "FF bit 0")
+ PORT_DIPSETTING( 0x01, DEF_STR(Off))
+ PORT_DIPSETTING( 0x00, DEF_STR(On))
+ PORT_DIPNAME( 0x02, 0x02, "FF bit 1")
+ PORT_DIPSETTING( 0x02, DEF_STR(Off))
+ PORT_DIPSETTING( 0x00, DEF_STR(On))
+ PORT_DIPNAME( 0x04, 0x04, "FF bit 2")
+ PORT_DIPSETTING( 0x04, DEF_STR(Off))
+ PORT_DIPSETTING( 0x00, DEF_STR(On))
+ PORT_DIPNAME( 0x08, 0x08, "FF bit 3")
+ PORT_DIPSETTING( 0x08, DEF_STR(Off))
+ PORT_DIPSETTING( 0x00, DEF_STR(On))
+ PORT_DIPNAME( 0x10, 0x10, "FF bit 4")
+ PORT_DIPSETTING( 0x10, DEF_STR(Off))
+ PORT_DIPSETTING( 0x00, DEF_STR(On))
+ PORT_DIPNAME( 0x20, 0x20, "FF bit 5")
+ PORT_DIPSETTING( 0x20, DEF_STR(Off))
+ PORT_DIPSETTING( 0x00, DEF_STR(On))
+ PORT_DIPNAME( 0x40, 0x40, "FF bit 6")
+ PORT_DIPSETTING( 0x40, DEF_STR(Off))
+ PORT_DIPSETTING( 0x00, DEF_STR(On))
+ PORT_DIPNAME( 0x80, 0x80, "FF bit 7")
+ PORT_DIPSETTING( 0x80, DEF_STR(Off))
+ PORT_DIPSETTING( 0x00, DEF_STR(On))
+
+ PORT_START("S3")
+ PORT_DIPNAME( 0xff, 0x08, "Baud Rate")
+ PORT_DIPSETTING( 0x01, "75")
+ PORT_DIPSETTING( 0x02, "110")
+ PORT_DIPSETTING( 0x04, "180")
+ PORT_DIPSETTING( 0x08, "300")
+ PORT_DIPSETTING( 0x10, "600")
+ PORT_DIPSETTING( 0x20, "1200")
+ PORT_DIPSETTING( 0x40, "2400")
+ PORT_DIPSETTING( 0x80, "4800/9600")
+
+ PORT_START("S4")
+ PORT_DIPNAME( 0x11, 0x10, "Parity")
+ PORT_DIPSETTING( 0x00, "Even")
+ PORT_DIPSETTING( 0x01, "Odd")
+ PORT_DIPSETTING( 0x10, DEF_STR(None))
+ PORT_DIPNAME( 0x06, 0x06, "Data Bits")
+ PORT_DIPSETTING( 0x00, "5")
+ PORT_DIPSETTING( 0x02, "6")
+ PORT_DIPSETTING( 0x04, "7")
+ PORT_DIPSETTING( 0x06, "8")
+ PORT_DIPNAME( 0x08, 0x08, "Stop Bits")
+ PORT_DIPSETTING( 0x00, "1")
+ PORT_DIPSETTING( 0x08, "2")
+ PORT_DIPNAME( 0x20, 0x00, "Duplex")
+ PORT_DIPSETTING( 0x00, "Half")
+ PORT_DIPSETTING( 0x20, "Full")
+
+ PORT_START("CONFIG")
+ PORT_CONFNAME( 0x01, 0x01, "High Baud Rate") // jumper on the board
+ PORT_CONFSETTING( 0x00, "4800")
+ PORT_CONFSETTING( 0x01, "9600")
+ PORT_CONFNAME( 0x02, 0x00, "Character Rom")
+ PORT_CONFSETTING( 0x00, "6574")
+ PORT_CONFSETTING( 0x02, "6575")
+ PORT_CONFNAME( 0x04, 0x04, "Field Rate") // modification described on page III-40 of Sol Systems Manual
+ PORT_CONFSETTING( 0x00, "50 Hz")
+ PORT_CONFSETTING( 0x04, "60 Hz")
+ PORT_CONFNAME( 0x18, 0x18, "CPU Clock")
+ PORT_CONFSETTING( 0x18, "2.04 MHz (8080A)")
+ PORT_CONFSETTING( 0x10, "2.36 MHz (8080A-2)")
+ PORT_CONFSETTING( 0x08, "2.86 MHz (8080A-1)")
+INPUT_PORTS_END
+
+
+void sol20_state::machine_start()
+{
+ m_cassette_timer = timer_alloc(FUNC(sol20_state::sol20_cassette_tc), this);
+ save_item(NAME(m_sol20_fa));
+ save_item(NAME(m_sol20_fc));
+ save_item(NAME(m_sol20_fe));
+ save_item(NAME(m_framecnt)); // unimportant
+}
+
+void sol20_state::machine_reset()
+{
+ u8 data = 0, s_count = 0;
+ int s_clock;
+ const u16 s_bauds[8]={ 75, 110, 180, 300, 600, 1200, 2400, 4800 };
+ m_sol20_fe=0;
+ m_sol20_fa=1;
+
+ // set hard-wired uart pins
+ m_uart->write_cs(0);
+ m_uart->write_nb1(1);
+ m_uart->write_nb2(1);
+ m_uart->write_tsb(1);
+ m_uart->write_eps(1);
+ m_uart->write_np(1);
+ m_uart->write_cs(1);
+
+ // set switched uart pins
+ data = m_iop_s4->read();
+ m_uart_s->write_cs(0);
+ m_uart_s->write_nb1(BIT(data, 1));
+ m_uart_s->write_nb2(BIT(data, 2));
+ m_uart_s->write_tsb(BIT(data, 3));
+ m_uart_s->write_eps(BIT(data, 0));
+ m_uart_s->write_np(BIT(data, 4));
+ m_uart_s->write_cs(1);
+
+ // set rs232 baud rate
+ data = m_iop_s3->read();
+
+ if (data > 1)
+ do
+ {
+ s_count++;
+ data >>= 1;
+ }
+ while (!(data & 1) && (s_count < 7)); // find which switch is used
+
+ if ( (s_count == 7) & BIT(m_iop_config->read(), 0) ) // if highest, look at jumper
+ s_clock = 9600 << 4;
+ else
+ s_clock = s_bauds[s_count] << 4;
+
+ m_uart_s_clock->set_unscaled_clock(s_clock);
+
+ m_rs232->write_dtr(0);
+ m_rs232->write_rts(1);
+
+ int lines = BIT(m_iop_config->read(), 2) ? 260 : 312;
+ m_screen->configure(918, lines, m_screen->visible_area(), attotime::from_ticks(918 * lines, 14.318181_MHz_XTAL).as_attoseconds());
+
+ // set CPU speed (TODO: also present on bus pin 49)
+ double freq = (14.318181_MHz_XTAL / (4 + ((m_iop_config->read() >> 3) & 3))).dvalue();
+ m_maincpu->set_unscaled_clock(freq);
+
+ // Boot tap
+ address_space &program = m_maincpu->space(AS_PROGRAM);
+ program.install_rom(0x0000, 0x07ff, m_rom); // do it here for F3
+ m_rom_shadow_tap.remove();
+ m_rom_shadow_tap = program.install_read_tap(
+ 0xc000, 0xc7ff,
+ "rom_shadow_r",
+ [this] (offs_t offset, u8 &data, u8 mem_mask)
+ {
+ if (!machine().side_effects_disabled())
+ {
+ // delete this tap
+ m_rom_shadow_tap.remove();
+
+ // reinstall RAM over the ROM shadow
+ m_maincpu->space(AS_PROGRAM).install_ram(0x0000, 0x07ff, m_ram);
+ }
+ },
+ &m_rom_shadow_tap);
+}
+
+
+u32 sol20_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
+{
+// Visible screen is 64 x 16, with start position controlled by scroll register.
+// Each character is 9 pixels wide (blank ones at the right) and 13 lines deep.
+// Note on blinking characters:
+// any character with bit 7 set will blink. With DPMON, do DA C000 C2FF to see what happens
+ u16 which = (m_iop_config->read() & 2) << 10;
+ u8 s1 = m_iop_s1->read();
+ u16 sy=0;
+ u8 polarity = (s1 & 8) ? 0xff : 0;
+
+ bool cursor_inv = false;
+ if (((s1 & 0x30) == 0x20) || (((s1 & 0x30) == 0x10) && (m_framecnt & 0x08)))
+ cursor_inv = true;
+
+ m_framecnt++;
+
+ u16 ma = m_sol20_fe << 6; // scroll register
+
+ for (u8 y = 0; y < 16; y++)
+ {
+ for (u8 ra = 0; ra < 13; ra++)
+ {
+ u16 *p = &bitmap.pix(sy++);
+
+ for (u16 x = ma; x < ma + 64; x++)
+ {
+ u16 inv = polarity;
+ u8 chr = m_vram[x & 0x3ff];
+
+ // cursor
+ if (BIT(chr, 7) && cursor_inv)
+ inv ^= 0xff;
+
+ chr &= 0x7f;
+
+ u8 gfx;
+ if ((ra == 0) || ((s1 & 4) && (chr < 0x20)))
+ gfx = inv;
+ else if ((chr==0x2C) || (chr==0x3B) || (chr==0x67) || (chr==0x6A) || (chr==0x70) || (chr==0x71) || (chr==0x79))
+ {
+ if (ra < 4)
+ gfx = inv;
+ else
+ gfx = m_p_chargen[which | (chr<<4) | (ra-4) ] ^ inv;
+ }
+ else
+ {
+ if (ra < 10)
+ gfx = m_p_chargen[which | (chr<<4) | (ra-1) ] ^ inv;
+ else
+ gfx = inv;
+ }
+
+ /* Display a scanline of a character */
+ *p++ = BIT(gfx, 7);
+ *p++ = BIT(gfx, 6);
+ *p++ = BIT(gfx, 5);
+ *p++ = BIT(gfx, 4);
+ *p++ = BIT(gfx, 3);
+ *p++ = BIT(gfx, 2);
+ *p++ = BIT(gfx, 1);
+ *p++ = BIT(gfx, 0);
+ *p++ = BIT(inv, 0);
+ }
+ }
+ ma+=64;
+ }
+ return 0;
+}
+
+/* F4 Character Displayer */
+static const gfx_layout sol20_charlayout =
+{
+ 7, 9, /* 7 x 9 characters */
+ 128*2, /* 128 characters per rom */
+ 1, /* 1 bits per pixel */
+ { 0 }, /* no bitplanes */
+ /* x offsets */
+ { 0, 1, 2, 3, 4, 5, 6 },
+ /* y offsets */
+ { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8 },
+ 8*16 /* every char takes 16 bytes */
+};
+
+static GFXDECODE_START( gfx_sol20 )
+ GFXDECODE_ENTRY( "chargen", 0x0000, sol20_charlayout, 0, 1 )
+GFXDECODE_END
+
+void sol20_state::kbd_put(u8 data)
+{
+ if (data)
+ {
+ m_sol20_fa &= 0xfe;
+ m_sol20_fc = data;
+ }
+}
+
+void sol20_state::sol20(machine_config &config)
+{
+ /* basic machine hardware */
+ I8080A(config, m_maincpu, 14.318181_MHz_XTAL / 7); // divider selectable as 5, 6 or 7 through jumpers
+ m_maincpu->set_addrmap(AS_PROGRAM, &sol20_state::mem_map);
+ m_maincpu->set_addrmap(AS_IO, &sol20_state::io_map);
+ m_maincpu->out_inte_func().set("speaker", FUNC(speaker_sound_device::level_w));
+
+ /* video hardware */
+ SCREEN(config, m_screen, SCREEN_TYPE_RASTER);
+ m_screen->set_raw(14.318181_MHz_XTAL, 918, 0, 576, 260, 0, 208);
+ m_screen->set_screen_update(FUNC(sol20_state::screen_update));
+ m_screen->set_palette("palette");
+
+ GFXDECODE(config, "gfxdecode", "palette", gfx_sol20);
+ PALETTE(config, "palette", palette_device::MONOCHROME);
+
+ /* sound hardware */
+ SPEAKER(config, "mono").front_center();
+ SPEAKER_SOUND(config, "speaker").add_route(ALL_OUTPUTS, "mono", 2.00); // music board
+
+ // devices
+ CASSETTE(config, m_cass1).set_formats(sol20_cassette_formats);
+ m_cass1->set_default_state(CASSETTE_PLAY | CASSETTE_MOTOR_ENABLED | CASSETTE_SPEAKER_ENABLED);
+ m_cass1->add_route(ALL_OUTPUTS, "mono", 0.05); // cass1 speaker
+ m_cass1->set_interface("sol20_cass");
+
+ CASSETTE(config, m_cass2).set_formats(sol20_cassette_formats);
+ m_cass2->set_default_state(CASSETTE_PLAY | CASSETTE_MOTOR_ENABLED | CASSETTE_SPEAKER_ENABLED);
+ m_cass2->add_route(ALL_OUTPUTS, "mono", 0.05); // cass2 speaker
+ m_cass2->set_interface("sol20_cass");
+
+ AY51013(config, m_uart); // TMS6011NC
+ m_uart->set_auto_rdav(true); // ROD (pin 4) tied to RDD (pin 18)
+
+ CLOCK(config, m_uart_clock, 4800);
+ m_uart_clock->signal_handler().set(m_uart, FUNC(ay51013_device::write_rcp));
+ m_uart_clock->signal_handler().append(m_uart, FUNC(ay51013_device::write_tcp));
+
+ RS232_PORT(config, m_rs232, default_rs232_devices, nullptr);
+
+ AY51013(config, m_uart_s); // TMS6011NC
+ m_uart_s->read_si_callback().set(m_rs232, FUNC(rs232_port_device::rxd_r));
+ m_uart_s->write_so_callback().set(m_rs232, FUNC(rs232_port_device::write_txd));
+ m_uart_s->set_auto_rdav(true); // ROD (pin 4) tied to RDD (pin 18)
+
+ CLOCK(config, m_uart_s_clock, 4800);
+ m_uart_s_clock->signal_handler().set(m_uart_s, FUNC(ay51013_device::write_rcp));
+ m_uart_s_clock->signal_handler().append(m_uart_s, FUNC(ay51013_device::write_tcp));
+
+ generic_keyboard_device &keyboard(GENERIC_KEYBOARD(config, "keyboard", 0));
+ keyboard.set_keyboard_callback(FUNC(sol20_state::kbd_put));
+
+ SOFTWARE_LIST(config, "cass_list").set_original("sol20_cass");
+}
+
+/* ROM definition */
+ROM_START( sol20 )
+ ROM_REGION( 0x0800, "maincpu", 0 )
+ ROM_SYSTEM_BIOS(0, "solos", "SOLOS")
+ ROMX_LOAD( "solos.bin", 0x0000, 0x0800, CRC(4d0af383) SHA1(ac4510c3380ed4a31ccf4f538af3cb66b76701ef), ROM_BIOS(0) ) // from solace emu
+ ROM_SYSTEM_BIOS(1, "dpmon", "DPMON")
+ ROMX_LOAD( "dpmon.bin", 0x0000, 0x0800, BAD_DUMP CRC(2a84f099) SHA1(60ff6e38082c50afcf0f40707ef65668a411008b), ROM_BIOS(1) )
+ ROM_SYSTEM_BIOS(2, "consol", "CONSOL")
+ ROMX_LOAD( "consol.bin", 0x0000, 0x0400, BAD_DUMP CRC(80bf6d85) SHA1(84b81c60bb08a3a5435ec1be56a67aa695bce099), ROM_BIOS(2) )
+ ROM_SYSTEM_BIOS(3, "solos2", "Solos Patched")
+ ROMX_LOAD( "solos2.bin", 0x0000, 0x0800, CRC(7776cc7d) SHA1(c4739a9ea7e8146ce7ae3305ed526b6045efa9d6), ROM_BIOS(3) ) // from Nama
+ ROM_SYSTEM_BIOS(4, "bootload", "BOOTLOAD")
+ ROMX_LOAD( "bootload.bin", 0x0000, 0x0800, BAD_DUMP CRC(4261ac71) SHA1(4752408ac85d88857e8e9171c7f42bd623c9271e), ROM_BIOS(4) ) // from Nama
+ // This one doesn't work
+ ROM_SYSTEM_BIOS(5, "cuter", "CUTER")
+ ROMX_LOAD( "cuter.bin", 0x0000, 0x0800, BAD_DUMP CRC(39cca901) SHA1(33725d6da63e295552ee13f0a735d33aee8f0d17), ROM_BIOS(5) ) // from Nama
+
+ ROM_REGION( 0x1000, "chargen", 0 )
+ ROM_LOAD( "6574.bin", 0x0000, 0x0800, BAD_DUMP CRC(fd75df4f) SHA1(4d09aae2f933478532b7d3d1a2dee7123d9828ca) )
+ ROM_LOAD( "6575.bin", 0x0800, 0x0800, BAD_DUMP CRC(cfdb76c2) SHA1(ab00798161d13f07bee3cf0e0070a2f0a805591f) )
+
+ ROM_REGION( 0x100, "keyboard", 0 )
+ ROM_LOAD( "8574.u18", 0x000, 0x100, NO_DUMP ) // 256x4 bipolar PROM or mask ROM; second half unused
+ROM_END
+
+} // anonymous namespace
+
+/* Driver */
+// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS
+COMP( 1976, sol20, 0, 0, sol20, sol20, sol20_state, empty_init, "Processor Technology Corporation", "Sol-20 Terminal Computer", MACHINE_SUPPORTS_SAVE )