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+// license:BSD-3-Clause
+// copyright-holders:Joakim Larsson Edstrom
+/*
+ *
+ * History of Didact and Esselte Studium
+ *--------------------------------------
+ * Didact Laromedelsproduktion was started in Linkoping in Sweden by Anders Andersson, Arne Kullbjer and
+ * Lars Bjorklund. They constructed a series of microcomputers for educational purposes such as "Mikrodator 6802",
+ * Esselte 100 and the Candela computer for the swedish schools to educate the students in assembly programming
+ * and BASIC for electro mechanical applications such as stepper motors, simple process control, buttons
+ * and LED:s. Didact designs were marketed by Esselte Studium to the swedish schools. Late designs like the
+ * "Modulab v2" appears to have been owned or licensed to Esselte and enhanced with more modular monitor routines
+ * in a project driven by Alf Karlsson.
+ *
+ * The Esselte 1000 was an educational package based on Apple II plus software and literature
+ * but the relation to Didact is at this point unknown so it is probably a pure Esselte software production.
+ *
+ * Misc links about the boards supported by this driver.
+ *-----------------------------------------------------
+ * http://elektronikforumet.com/forum/viewtopic.php?f=11&t=51424
+ * http://kilroy71.fastmail.fm/gallery/Miscellaneous/20120729_019.jpg
+ * http://elektronikforumet.com/forum/download/file.php?id=63988&mode=view
+ * http://elektronikforumet.com/forum/viewtopic.php?f=2&t=79576&start=150#p1203915
+ *
+ * TODO:
+ * Didact designs: mp68a, md6802, Modulab
+ * ------------------------------------------
+ * - Add PCB layouts OK OK OK
+ * - Dump ROM:s, OK OK OK
+ * - Keyboard OK OK OK
+ * - Display/CRT OK OK OK
+ * - Clickable Artwork RQ RQ OK
+ * - Sound NA NA
+ * - Cassette i/f
+ * - Expansion bus
+ * - Expansion overlay
+ * - Interrupts OK
+ * - Serial XX
+ * XX = needs debug
+ *********************************************/
+
+#include "emu.h"
+#include "cpu/m6800/m6800.h" // For all boards
+#include "machine/6821pia.h" // For all boards
+#include "machine/74145.h" // For the md6802
+#include "video/dm9368.h" // For the mp68a
+#include "machine/ins8154.h" // For the modulab
+#include "machine/mm74c922.h"// For the modulab
+#include "machine/rescap.h" // For the modulab
+
+// Features
+#include "imagedev/cassette.h"
+#include "bus/rs232/rs232.h"
+#include "screen.h"
+#include "speaker.h"
+
+// Generated artwork includes
+#include "mp68a.lh"
+#include "md6802.lh"
+#include "modulab.lh"
+
+//**************************************************************************
+// MACROS / CONSTANTS
+//**************************************************************************
+
+#define LOG_SETUP (1U << 1)
+#define LOG_READ (1U << 2)
+#define LOG_DISPLAY (1U << 3)
+#define LOG_KEYBOARD (1U << 4)
+
+//#define VERBOSE (LOG_KEYBOARD)
+//#define LOG_OUTPUT_FUNC printf
+#include "logmacro.h"
+
+#define LOGSETUP(...) LOGMASKED(LOG_SETUP, __VA_ARGS__)
+#define LOGREAD(...) LOGMASKED(LOG_READ, __VA_ARGS__)
+#define LOGDISPLAY(...) LOGMASKED(LOG_DISPLAY, __VA_ARGS__)
+#define LOGKBD(...) LOGMASKED(LOG_KEYBOARD, __VA_ARGS__)
+
+#ifdef _MSC_VER
+#define FUNCNAME __func__
+#else
+#define FUNCNAME __PRETTY_FUNCTION__
+#endif
+
+
+namespace {
+
+#define PIA1_TAG "pia1"
+#define PIA2_TAG "pia2"
+#define PIA3_TAG "pia3"
+#define PIA4_TAG "pia4"
+#define MM74C923_TAG "74c923"
+
+/* Didact base class */
+class didact_state : public driver_device
+{
+public:
+ didact_state(const machine_config &mconfig, device_type type, const char * tag)
+ : driver_device(mconfig, type, tag)
+ , m_cass(*this, "cassette")
+ , m_io_lines(*this, "LINE%u", 0U)
+ , m_lines{ 0, 0, 0, 0 }
+ , m_rs232(*this, "rs232")
+ , m_led(*this, "led1")
+ { }
+
+ DECLARE_INPUT_CHANGED_MEMBER(trigger_reset);
+ DECLARE_INPUT_CHANGED_MEMBER(trigger_shift);
+
+protected:
+ virtual void machine_start() override { m_led.resolve(); }
+
+ optional_device<cassette_image_device> m_cass;
+ required_ioport_array<5> m_io_lines;
+ uint8_t m_lines[4]{};
+ uint8_t m_reset = 0;
+ uint8_t m_shift = 0;
+ optional_device<rs232_port_device> m_rs232;
+ output_finder<> m_led;
+};
+
+
+/* _____________________________________________________________________________________________ ___________________________________________________________________________
+ * |The Didact Mikrodator 6802 CPU board by Lars Bjorklund 1983 ( ) | |The Didact Mikrodator 6802 TB16 board by Lars Bjorklund 1983 |
+ * | +----= | | +-|||||||-+ ______ |
+ * | | = | | CA2 Tx |terminal | | () | |
+ * | | = | | PA7 Rx +---------+ +----------+ C1nF,<=R18k| | |
+ * | Photo of CPU board mainly covered by TB16 Keypad/Display board +--- = | | CA1 DTR +-----------+ | | CB2->CB1 | E | |
+ * | | | PA4-PA6 | | 1 | BCD | +----+ | X | |
+ * | | | ------->| 74LS145 | | digit 5 | |LS | | P | |
+ * | | | +-----------+ |----------| | 122| | A | |
+ * | +-----=| | | | | | | | N | |
+ * | +-------+ | =| |------ +--------+ | 2 | BCD | | | | S | |
+ * | | | | =| | RES* | SHIFT | LED( ) | | digit 4 | | | | I | |
+ * | | | | =| | | '*' | CA2 v |----------| +----+ | O | |
+ * | | 6821 | | =| | PA3 |PA7 PA2 | PA1 PA0 | | +----| N | |
+ * | | PIA | | =| |----|--+-----|--+--|-----+--|---+ 3 | | PB0-|LS | | |
+ * | | | | =| | v | v | v | v | | BCD | PB7| 244| C | |
+ * | | | | =| | ADR | RUN | SST | CON | 1 | digit 3 | --->| | O | |
+ * | | | | =| | 0 | 4 | 8 | C | |----------| | | N | |
+ * | | | | =| |-------+--------+--------+------+ | |<-------| | N | |
+ * | | | | =| | | | | | 4 | | +----| E | |
+ * | | | | =| | STA | BPS | USERV | | 2 | BCD | | C | |
+ * | | | | =| | 1 | 5 | 9 | D | | digit 2 | | T | |
+ * | | | | =| |-------+--------+--------+------+ |----------| | O | |
+ * | | | | =| | | | | | | | | R | |
+ * | | | | =| | EXF | EXB | MOV | LOAD | 3 5 | BCD | | | |
+ * | | | | =| | 2 | 6 | A | E | | digit 1 | | | |
+ * | +-------+ | =| |-------+--------+--------+------+ |----------| | | |
+ * | | =| | | | | | | | | | |
+ * | +-----=| | CLR | SP | USERJ | FLAG | 4 6 | BCD | | | |
+ * | | | 3 | 7 | B | F | | digit 0 | | () | |
+ * | | |-------+--------+--------+------+ +----------+ +------+ |
+ * | | | |
+ * | | | |
+ * |____________________________________________________________________________________________| |___________________________________________________________________________|
+ */
+
+/* Mikrodator 6802 driver class */
+class md6802_state : public didact_state
+{
+public:
+ md6802_state(const machine_config &mconfig, device_type type, const char * tag)
+ : didact_state(mconfig, type, tag)
+ , m_maincpu(*this, "maincpu")
+ , m_tb16_74145(*this, "tb16_74145")
+ , m_pia1(*this, PIA1_TAG)
+ , m_pia2(*this, PIA2_TAG)
+ , m_7segs(*this, "digit%u", 0U)
+ , m_segments(0)
+ { }
+
+ void md6802(machine_config &config);
+
+protected:
+ uint8_t pia2_kbA_r();
+ void pia2_kbA_w(uint8_t data);
+ uint8_t pia2_kbB_r();
+ void pia2_kbB_w(uint8_t data);
+ void pia2_ca2_w(int state);
+
+ virtual void machine_reset() override ATTR_COLD;
+ virtual void machine_start() override ATTR_COLD;
+
+ void md6802_map(address_map &map) ATTR_COLD;
+
+private:
+ required_device<m6802_cpu_device> m_maincpu;
+ required_device<ttl74145_device> m_tb16_74145;
+ required_device<pia6821_device> m_pia1;
+ required_device<pia6821_device> m_pia2;
+ output_finder<6> m_7segs;
+ uint8_t m_segments;
+};
+
+/* Keyboard */
+uint8_t md6802_state::pia2_kbA_r()
+{
+ uint8_t ls145;
+ uint8_t pa = 0xff;
+
+ // Read out the selected column
+ ls145 = m_tb16_74145->read() & 0x0f;
+
+ // read out the artwork, line04 is handled by the timer
+ for (unsigned i = 0U; 4U > i; ++i)
+ {
+ m_lines[i] = m_io_lines[i]->read();
+
+ // Mask out those rows that has a button pressed
+ pa &= ~(((~m_lines[i] & ls145) != 0) ? (1 << i) : 0);
+ }
+
+ if (m_shift)
+ {
+ pa &= 0x7f; // Clear shift bit if button being pressed (PA7) to ground (internal pullup)
+ LOGKBD("SHIFT is pressed\n");
+ }
+
+ // Serial IN - needs debug/verification
+ pa &= (m_rs232->rxd_r() != 0 ? 0xff : 0x7f);
+
+ return pa;
+}
+
+/* Pull the cathodes low enabling the correct digit and lit the segments held by port B */
+void md6802_state::pia2_kbA_w(uint8_t data)
+{
+// LOG("--->%s(%02x)\n", FUNCNAME, data);
+
+ uint8_t const digit_nbr((data >> 4) & 0x07);
+ m_tb16_74145->write(digit_nbr);
+ if (digit_nbr < 6)
+ m_7segs[digit_nbr] = m_segments;
+}
+
+/* PIA 2 Port B is all outputs to drive the display so it is very unlikely that this function is called */
+uint8_t md6802_state::pia2_kbB_r()
+{
+ LOG("Warning, trying to read from Port B designated to drive the display, please check why\n");
+ logerror("Warning, trying to read from Port B designated to drive the display, please check why\n");
+ return 0;
+}
+
+/* Port B is fully used outputting the segment pattern to the display */
+void md6802_state::pia2_kbB_w(uint8_t data)
+{
+// LOG("--->%s(%02x)\n", FUNCNAME, data);
+
+ /* Store the segment pattern but do not lit up the digit here, done by pulling the correct cathode low on Port A */
+ m_segments = bitswap<8>(data, 0, 4, 5, 3, 2, 1, 7, 6);
+}
+
+void md6802_state::pia2_ca2_w(int state)
+{
+ LOGKBD("--->%s(%02x) LED is connected through resisitor to +5v so logical 0 will lit it\n", FUNCNAME, state);
+ m_led = state ? 0 :1;
+
+ // Serial Out - needs debug/verification
+ m_rs232->write_txd(state);
+
+ m_shift = !state;
+}
+
+void md6802_state::machine_start()
+{
+ LOG("--->%s()\n", FUNCNAME);
+
+ didact_state::machine_start();
+ m_7segs.resolve();
+
+ save_item(NAME(m_reset));
+ save_item(NAME(m_shift));
+}
+
+void md6802_state::machine_reset()
+{
+ LOG("--->%s()\n", FUNCNAME);
+ m_maincpu->reset();
+}
+
+// This address map is traced from schema
+void md6802_state::md6802_map(address_map &map)
+{
+ map(0x0000, 0x07ff).ram().mirror(0x1800);
+ map(0xa000, 0xa003).rw(m_pia1, FUNC(pia6821_device::read), FUNC(pia6821_device::write)).mirror(0x1ffc);
+ map(0xc000, 0xc003).rw(m_pia2, FUNC(pia6821_device::read), FUNC(pia6821_device::write)).mirror(0x1ffc);
+ map(0xe000, 0xe7ff).rom().mirror(0x1800).region("maincpu", 0xe000);
+}
+
+/*
+ * ___________________________________________________________________________________________________________ _____________________________________________________
+ * | The Didact Mp68A CPU board, by Anders Andersson 1979 | |The Didact Mp68A keypad/display PB6 +oooo+ |
+ * | +------+ +-------+ +--+ | | by Anders Andersson 1979 +-------+ |cass| |
+ * | | 7402 | | 74490 | | | +-------+ +--+ | | +--+ | 9368 | +----+ +--+|
+ * | +-------+ +------+ +-------+ | | | | | | | |+-------+ 2x5082-|B | +-------+ | ||
+ * | | | 2112 2112 | | | EXP | | | | || 74132 | 7433|CD| 145 PA0-PA3 |E ||
+ * | | ROM | +--+ +--+ +--+ | ANS | |P | | |+-------+ |DI| +--+ 132 |X ||
+ * | | 7641 | | | | | | ION | |I | | |+------+------+ | S| | | +--+ |P ||
+ * | | | |A | |B | +-----+ | BUSES | |A | | || |SHIFT | | P| | | PA4-PA6 | | |A ||
+ * | | 512x8 | | | | | | | | (2 x) | | | | || RES |(led) | +--+ | | | | |N ||
+ * | | | +--+ +--+ | | | FOR | |A | | || | * | +--+ | | |S ||
+ * | +-------+ RAMS 4x256x4 | | | | | | | |+------+------+------+------+ +--+ |I ||
+ * | ROMS 2x512x8 2112 2112 | | | KEY | |E | | || | | | | |O ||
+ * | +-------+ +--+ +--+ |CPU | | BOARD | +------+ |X | | || ADR | RUN | SST | REG | |N ||
+ * | | | | | | | |6800 | | | | | |P | | || 0 | 4 | 8 | C | | ||
+ * | | ROM | |A | |B | | | | AND | | | |A | | |+------+------+------+------+ |C ||
+ * | | 7641 | | | | | | | | | | | |N | | || | | | | |O ||
+ * | | | +--+ +--+ | | | I/O | | 6820 | |S | | || STA | STO | BPR | BPS | |N ||
+ * | | 512x8 | 512 bytes RAM | | | BOARDS| | PIA | |I | | || 1 | 5 | 9 | D | |N ||
+ * | +-------+ | | | | | #1 | |O | +-----+ |+------+------+------+------+ +------+ |E ||
+ * | 1024 bytes ROM | | | | | | |N | | | || | | | | | | |C ||
+ * | +-----+ | | | | | | PIA A | | || EXF | EXB | MOV | PRM | | | |T ||
+ * | 7402 7412 | | | | |B | EXPANSION| | || 2 | 6 | A | E | | | |O ||
+ * | +--+ +--+ | | | | |U | CONNECTOR| | |+------+------+------+------+ | 6820 | |R ||
+ * | | | | | | | | | |S | | _| || | | | | | PIA | | ||
+ * | | | | | | | | | | | J4 | | || CLR | REL | REC | PLA | | #2 | | ||
+ * | | | | | | | +------+ | | | |_ || 3 | 7 | B | F | | | | ||
+ * | +--+ +--+ +--------+ | | | | | | |+------+------+------+------+ | | | ||
+ * | +-+ | 96LS02 | | | | | | | | +-------+ +-------+ +------+ | | | ||
+ * | R * * * R |T| +--------+ | | | | | | | | 74148 | | 74148 | | 7400 | | | | ||
+ * | O X A |R| | | | | | | | +-------+ +-------+ +------+ | | +--+|
+ * | M * * * M |M| Oscillator circuits +-------+ +--+ | | | PB3 PB0-PB2 | | |
+ * | |_| J1 J2 J3 +-----+ | +---------+ +------+ J1 |
+ * |____________________________________________________________________________________________________________| |______ | _|||_ |___________________________________|
+ *
+ */
+/* Didact mp68a driver class */
+
+// The real mp68a hardware was designed with 6820 and not 6821.
+// They are functional equivalents BUT has different electrical characteristics.
+// 2019-07-27 Cassette added: saves ok, load is unreliable, probably an original design problem.
+class mp68a_state : public didact_state
+{
+public:
+ mp68a_state(const machine_config &mconfig, device_type type, const char * tag)
+ : didact_state(mconfig, type, tag)
+ , m_maincpu(*this, "maincpu")
+ , m_digits(*this, "digit%u", 0U)
+ , m_7segs(*this, "digit%u", 0U)
+ , m_pia1(*this, PIA1_TAG)
+ , m_pia2(*this, PIA2_TAG)
+ { }
+
+ required_device<m6800_cpu_device> m_maincpu;
+
+ // The display segment driver device (there is actually just one, needs rewrite to be correct)
+ required_device_array<dm9368_device, 6> m_digits;
+ output_finder<6> m_7segs;
+
+ uint8_t pia2_kbA_r();
+ void pia2_kbA_w(uint8_t data);
+ uint8_t pia2_kbB_r();
+ void pia2_kbB_w(uint8_t data);
+ int pia2_cb1_r();
+ template <unsigned N> void digit_w(uint8_t data) { m_7segs[N] = data; }
+
+ virtual void machine_reset() override ATTR_COLD;
+ virtual void machine_start() override ATTR_COLD;
+ void mp68a(machine_config &config);
+ void mp68a_map(address_map &map) ATTR_COLD;
+
+protected:
+ required_device<pia6821_device> m_pia1;
+ required_device<pia6821_device> m_pia2;
+};
+
+INPUT_CHANGED_MEMBER(didact_state::trigger_shift)
+{
+ if (newval == CLEAR_LINE)
+ {
+ LOGKBD("SHIFT is released\n");
+ }
+ else
+ {
+ LOGKBD("SHIFT is pressed\n");
+ m_shift = 1;
+ m_led = 1;
+ }
+}
+
+uint8_t mp68a_state::pia2_kbA_r()
+{
+ LOG("--->%s\n", FUNCNAME);
+
+ return 0;
+}
+
+void mp68a_state::pia2_kbA_w(uint8_t data)
+{
+ /* Display memory is at $702 to $708 in AAAADD format (A=address digit, D=Data digit)
+ but we are using data read from the port. */
+ uint8_t const digit_nbr = (data >> 4) & 0x07;
+
+ /* There is actually only one 9368 and a 74145 to drive the cathode of the right digit low */
+ /* This can be emulated by pretending there are one 9368 per digit, at least for now */
+ switch (digit_nbr)
+ {
+ case 0:
+ case 1:
+ case 2:
+ case 3:
+ case 4:
+ case 5:
+ m_digits[digit_nbr]->a_w(data & 0x0f);
+ break;
+ case 7: // used as an 'unselect' by the ROM between digit accesses.
+ break;
+ default:
+ logerror("Invalid digit index %d\n", digit_nbr);
+ }
+}
+
+uint8_t mp68a_state::pia2_kbB_r()
+{
+ uint8_t a012, line, pb;
+
+ LOGKBD("--->%s %02x %02x %02x %02x %02x => ", FUNCNAME, m_lines[0], m_lines[1], m_lines[2], m_lines[3], m_shift);
+
+ a012 = 0;
+ if ((line = (m_lines[0] | m_lines[1])) != 0)
+ {
+ a012 = 8;
+ while (a012 > 0 && !(line & (1 << --a012)));
+ a012 += 8;
+ }
+ if (a012 == 0 && (line = ((m_lines[2]) | m_lines[3])) != 0)
+ {
+ a012 = 8;
+ while (a012 > 0 && !(line & (1 << --a012)));
+ }
+
+ pb = a012; // A0-A2 -> PB0-PB3
+
+ if (m_shift)
+ {
+ pb |= 0x80; // Set shift bit (PB7)
+ m_shift = 0; // Reset flip flop
+ m_led = 0;
+ LOGKBD(" SHIFT is released\n");
+ }
+
+ pb |= (m_cass->input() < 0.04) ? 0x20 : 0;
+ LOGKBD("%02x\n", pb);
+
+ return pb;
+}
+
+void mp68a_state::pia2_kbB_w(uint8_t data)
+{
+ LOG("--->%s(%02x)\n", FUNCNAME, data);
+ m_cass->output(BIT(data, 4) ? -1.0 : +1.0);
+}
+
+int mp68a_state::pia2_cb1_r()
+{
+ for (unsigned i = 0U; 4U > i; ++i)
+ m_lines[i] = m_io_lines[i]->read();
+
+ if ((VERBOSE & LOG_GENERAL) && (m_lines[0] | m_lines[1] | m_lines[2] | m_lines[3]))
+ LOG("%s()-->%02x %02x %02x %02x\n", FUNCNAME, m_lines[0], m_lines[1], m_lines[2], m_lines[3]);
+
+ return (m_lines[0] | m_lines[1] | m_lines[2] | m_lines[3]) ? 0 : 1;
+}
+
+void mp68a_state::machine_reset()
+{
+ LOG("--->%s()\n", FUNCNAME);
+ m_maincpu->reset();
+}
+
+void mp68a_state::machine_start()
+{
+ LOG("--->%s()\n", FUNCNAME);
+
+ didact_state::machine_start();
+ m_7segs.resolve();
+
+ /* register for state saving */
+ save_item(NAME(m_shift));
+ save_item(NAME(m_reset));
+}
+
+// This address map is traced from pcb
+void mp68a_state::mp68a_map(address_map &map)
+{
+ map(0x0000, 0x00ff).ram().mirror(0xf000);
+ map(0x0500, 0x0503).rw(m_pia1, FUNC(pia6821_device::read), FUNC(pia6821_device::write)).mirror(0xf0fc);
+ map(0x0600, 0x0603).rw(m_pia2, FUNC(pia6821_device::read), FUNC(pia6821_device::write)).mirror(0xf0fc);
+ map(0x0700, 0x07ff).ram().mirror(0xf000);
+ map(0x0800, 0x0bff).rom().mirror(0xf400).region("maincpu", 0x0800);
+}
+
+//===================
+
+/* The Modulab CPU board, by Didact/Esselte ca 1984
+ * __________________________________________________________________________________________
+ * | ADRESS DATA |
+ * | PORT A +-_--++-_--++-_--++-_--+ +-_--++-_--+ VCC |
+ * | o o o o o o o o || | ||| | ||| | ||| | | || | ||| | | O |
+ * | 7 6 5 4 3 2 1 0 | - || - || - || - | | - || - | |
+ * | o o o o o o o o ||_|.|||_|.|||_|.|||_|.| ||_|.|||_|.| GND |
+ * | PORT B +----++----++----++----+ +----++----+ O |
+ * | o VCC +--+ +--+ +--+ +--+ +--+ +--+ |
+ * | |LS| |LS| |LS| |LS| |LS| |LS| |
+ * | o GND |164 |164 |164 |164 |164 |164 |
+ * \\ |-5|<-|-4|<-|-3|<-|-2| <- |-1|<-|-0|<- DB0 |
+ * |\\ ____ +--+ +--+ +--+ +--+ +--+ +--+ |
+ * | \/o O| +-------+-------+-------+-------+-------+
+ * | | |E +--------------------+ +--+ | | | | | |
+ * | | |X +----+ | PIA + 128x8 SRAM | |LS| | RUN | ADS | FWD | C/B | RESET |
+ * | | |P |4MHz| | INS8154N | |14| | | | | | |
+ * | | |A |XTAL| +--------------------+ | | +-------+-------+-------+-------+-------+
+ * | | |N |____| +--+ | | | | | |
+ * | |__ |S | | +--------------------+ +--+ | C | D | E | F | |
+ * | __| |I | CPU | |LS| | | | | | |
+ * | | |O | MC6802P | |138 +-------+-------+-------+-------+ |
+ * | | |N +--------------------+ | | | | | | | |
+ * | | |B +--+ | 8 | 9 | A | B | |
+ * | | |U IRQ +-------------+ +--+ | | | | | |
+ * | | |S o | EPROM | |74| +-------+-------+-------+-------+ |
+ * | /\o O| | 2764 | |C | | | | | | |
+ * |// ---- +-------------+ |923 | 4 | 5 | 6 | 7 | |
+ * // +-----------+ | | | | | | | |
+ * | | 2KB SRAM | +--+ +-------+-------+-------+-------+ |
+ * | | 6116 | +--+ | | | | | |
+ * | +-----------+ |LS| | 0 | 1 | 2 | 3 | |
+ * | ESSELTE +-------+ +---+ +--------+ |138 | | | | | |
+ * | STUDIUM |74LS123| |TRM| |SN74367 | | | +-------+-------+-------+-------+ |
+ * | +-------+ +---+ +--------+ +--+
+ * |__________________________________________________________________________________________|
+ *
+ */
+
+/* Didact modulab driver class */
+class modulab_state : public didact_state
+{
+public:
+ modulab_state(const machine_config &mconfig, device_type type, const char * tag)
+ : didact_state(mconfig, type, tag)
+ , m_maincpu(*this, "maincpu")
+ , m_7segs(*this, "digit%u", 0U)
+ , m_pia1(*this, PIA1_TAG)
+ , m_kb(*this, MM74C923_TAG)
+ , m_da(0)
+ { }
+
+ required_device<m6802_cpu_device> m_maincpu;
+
+ output_finder<6> m_7segs;
+
+ virtual void machine_reset() override ATTR_COLD;
+ virtual void machine_start() override ATTR_COLD;
+ void modulab(machine_config &config);
+
+protected:
+ uint8_t io_r(offs_t offset);
+ void io_w(offs_t offset, u8 data);
+ void da_w(int state);
+
+private:
+ void modulab_map(address_map &map) ATTR_COLD;
+ // Offsets for display and keyboard i/o
+ enum
+ {
+ DISPLAY = 0,
+ KEY_DATA = 2,
+ KEY_STROBE = 3
+ };
+
+ // Simple emulation of 6 cascaded 74164 that drives the AAAADD BCD display elements, right to left
+ class shift8
+ {
+ public:
+ shift8() { byte = 0; }
+ void shiftIn(uint8_t in){ byte = ((byte << 1) & 0xfe) | (in & 1 ? 1 : 0); }
+ uint8_t byte;
+ };
+ shift8 m_74164[6];
+
+ required_device<ins8154_device> m_pia1;
+ required_device<mm74c922_device> m_kb;
+ uint8_t m_da;
+};
+
+void modulab_state::da_w(int state)
+{
+ LOG("--->%s()\n", FUNCNAME);
+ m_da = state == CLEAR_LINE ? 0 : 1; // Capture data available signal
+}
+
+uint8_t modulab_state::io_r(offs_t offset)
+{
+ switch (offset)
+ {
+ case 3: // Poll Data available signal
+ return m_da & 0x01; // Data Available signal gated by an 8097 hexbuffer to DB0
+ break;
+ case 2:
+ LOG("--->%s Read Keyboard @ %04x\n", FUNCNAME, offset);
+ return m_kb->read();
+ break;
+ default:
+ LOG("--->%s BAD access @ %04x\n", FUNCNAME, offset);
+ break;
+ }
+ return 0;
+}
+
+void modulab_state::io_w(offs_t offset, u8 data)
+{
+ LOG("--->%s()\n", FUNCNAME);
+ uint8_t b = data & 1;
+ switch (offset)
+ {
+ case DISPLAY:
+ // Update the BCD elements with a data bit b shifted in right to left, CS is used as clock for all 164's
+ for (int i = 0; i < 6; i++)
+ {
+ uint8_t c = (m_74164[i].byte & 0x80) ? 1 : 0; // Bit 7 is connected to the next BCD right to left
+ m_74164[i].shiftIn(b);
+ m_7segs[i] = ~m_74164[i].byte & 0x7f; // Bit 0 to 6 drives the 7 seg display
+ b = c; // bit 7 prior shift will be shifted in next (simultaneous in real life)
+ }
+ LOGDISPLAY("Shifted: %02x %02x %02x %02x %02x %02x\n",
+ ~m_74164[0].byte & 0x7f, ~m_74164[1].byte & 0x7f, ~m_74164[2].byte & 0x7f,
+ ~m_74164[3].byte & 0x7f, ~m_74164[4].byte & 0x7f, ~m_74164[5].byte & 0x7f);
+ break;
+ default:
+ break;
+ };
+}
+
+void modulab_state::machine_reset()
+{
+ LOG("--->%s()\n", FUNCNAME);
+
+ m_maincpu->reset();
+}
+
+void modulab_state::machine_start()
+{
+ LOG("--->%s()\n", FUNCNAME);
+
+ didact_state::machine_start();
+ m_7segs.resolve();
+
+ /* register for state saving */
+ save_item(NAME(m_shift));
+ save_item(NAME(m_reset));
+}
+
+// This address map is traced from pcb
+void modulab_state::modulab_map(address_map &map)
+{
+ map(0x0000, 0x03ff).ram().mirror(0xe000); // RAM0 always present 2114
+ map(0x0400, 0x07ff).ram().mirror(0xe000); // RAM1 optional 2114
+ // map(0x0800, 0x13ff).ram().mirror(0xe000); // expansion port area consisting of 3 chip selects each selecting 0x3ff byte addresses
+ map(0x1400, 0x17ff).rom().mirror(0xe000).region("maincpu", 0x0000);
+ map(0x1800, 0x187f).rw(FUNC(modulab_state::io_r), FUNC(modulab_state::io_w)).mirror(0xe200);
+ map(0x1900, 0x197f).rw(m_pia1, FUNC(ins8154_device::read_io), FUNC(ins8154_device::write_io)).mirror(0xe200);
+ map(0x1980, 0x19ff).rw(m_pia1, FUNC(ins8154_device::read_ram), FUNC(ins8154_device::write_ram)).mirror(0xe200);
+ map(0x1c00, 0x1fff).rom().mirror(0xe000).region("maincpu", 0x0400);
+}
+
+//===================
+
+static INPUT_PORTS_START( modulab )
+ PORT_START("LINE0") // X1
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_0) PORT_CHAR('0')
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_4) PORT_CHAR('4')
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_8) PORT_CHAR('8')
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_C) PORT_CHAR('C')
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("RUN") PORT_CODE(KEYCODE_R) PORT_CHAR('R')
+
+ PORT_START("LINE1") // X2
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_1) PORT_CHAR('1')
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_5) PORT_CHAR('5')
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_9) PORT_CHAR('9')
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_D) PORT_CHAR('D')
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("ADS") PORT_CODE(KEYCODE_Z) PORT_CHAR('Z')
+
+ PORT_START("LINE2") // X3
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_2) PORT_CHAR('2')
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_6) PORT_CHAR('6')
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_A) PORT_CHAR('A')
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_E) PORT_CHAR('E')
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("FWD") PORT_CODE(KEYCODE_W) PORT_CHAR('W')
+
+ PORT_START("LINE3") // X4
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_3) PORT_CHAR('3')
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_7) PORT_CHAR('7')
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_B) PORT_CHAR('B')
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_F) PORT_CHAR('F')
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("C/B") PORT_CODE(KEYCODE_X) PORT_CHAR('X')
+
+ PORT_START("LINE4") /* Special KEY ROW for reset key */
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Reset") PORT_CODE(KEYCODE_F12) PORT_CHANGED_MEMBER(DEVICE_SELF, FUNC(modulab_state::trigger_reset), 0)
+ PORT_BIT(0xfb, 0x00, IPT_UNUSED )
+INPUT_PORTS_END
+
+static INPUT_PORTS_START( md6802 )
+ PORT_START("LINE0") /* KEY ROW 0 */
+ PORT_BIT(0x01, 0x01, IPT_KEYBOARD) PORT_NAME("0") PORT_CODE(KEYCODE_0) PORT_CHAR('0')
+ PORT_BIT(0x02, 0x02, IPT_KEYBOARD) PORT_NAME("1") PORT_CODE(KEYCODE_1) PORT_CHAR('1')
+ PORT_BIT(0x04, 0x04, IPT_KEYBOARD) PORT_NAME("2") PORT_CODE(KEYCODE_2) PORT_CHAR('2')
+ PORT_BIT(0x08, 0x08, IPT_KEYBOARD) PORT_NAME("3") PORT_CODE(KEYCODE_3) PORT_CHAR('3')
+ PORT_BIT(0xf0, 0x00, IPT_UNUSED )
+
+ PORT_START("LINE1") /* KEY ROW 1 */
+ PORT_BIT(0x01, 0x01, IPT_KEYBOARD) PORT_NAME("4") PORT_CODE(KEYCODE_4) PORT_CHAR('4')
+ PORT_BIT(0x02, 0x02, IPT_KEYBOARD) PORT_NAME("5") PORT_CODE(KEYCODE_5) PORT_CHAR('5')
+ PORT_BIT(0x04, 0x04, IPT_KEYBOARD) PORT_NAME("6") PORT_CODE(KEYCODE_6) PORT_CHAR('6')
+ PORT_BIT(0x08, 0x08, IPT_KEYBOARD) PORT_NAME("7") PORT_CODE(KEYCODE_7) PORT_CHAR('7')
+ PORT_BIT(0xf0, 0x00, IPT_UNUSED )
+
+ PORT_START("LINE2") /* KEY ROW 2 */
+ PORT_BIT(0x01, 0x01, IPT_KEYBOARD) PORT_NAME("8") PORT_CODE(KEYCODE_8) PORT_CHAR('8')
+ PORT_BIT(0x02, 0x02, IPT_KEYBOARD) PORT_NAME("9") PORT_CODE(KEYCODE_9) PORT_CHAR('9')
+ PORT_BIT(0x04, 0x04, IPT_KEYBOARD) PORT_NAME("A") PORT_CODE(KEYCODE_A) PORT_CHAR('A')
+ PORT_BIT(0x08, 0x08, IPT_KEYBOARD) PORT_NAME("B") PORT_CODE(KEYCODE_B) PORT_CHAR('B')
+ PORT_BIT(0xf0, 0x00, IPT_UNUSED )
+
+ PORT_START("LINE3") /* KEY ROW 3 */
+ PORT_BIT(0x01, 0x01, IPT_KEYBOARD) PORT_NAME("C") PORT_CODE(KEYCODE_C) PORT_CHAR('C')
+ PORT_BIT(0x02, 0x02, IPT_KEYBOARD) PORT_NAME("D") PORT_CODE(KEYCODE_D) PORT_CHAR('D')
+ PORT_BIT(0x04, 0x04, IPT_KEYBOARD) PORT_NAME("E") PORT_CODE(KEYCODE_E) PORT_CHAR('E')
+ PORT_BIT(0x08, 0x08, IPT_KEYBOARD) PORT_NAME("F") PORT_CODE(KEYCODE_F) PORT_CHAR('F')
+ PORT_BIT(0xf0, 0x00, IPT_UNUSED )
+
+ PORT_START("LINE4") /* Special KEY ROW for reset and Shift/'*' keys */
+ PORT_BIT(0x08, 0x00, IPT_KEYBOARD) PORT_NAME("*") PORT_CODE(KEYCODE_LSHIFT) PORT_CODE(KEYCODE_RSHIFT) PORT_CHAR('*') PORT_CHANGED_MEMBER(DEVICE_SELF, FUNC(md6802_state::trigger_shift), 0)
+ PORT_BIT(0x04, 0x00, IPT_KEYBOARD) PORT_NAME("Reset") PORT_CODE(KEYCODE_F12) PORT_CHANGED_MEMBER(DEVICE_SELF, FUNC(md6802_state::trigger_reset), 0)
+ PORT_BIT(0xf3, 0x00, IPT_UNUSED )
+INPUT_PORTS_END
+
+static INPUT_PORTS_START( mp68a )
+ PORT_START("LINE0") /* KEY ROW 0 */
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("C") PORT_CODE(KEYCODE_C) PORT_CHAR('C')
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("D") PORT_CODE(KEYCODE_D) PORT_CHAR('D')
+ PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("E") PORT_CODE(KEYCODE_E) PORT_CHAR('E')
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("F") PORT_CODE(KEYCODE_F) PORT_CHAR('F')
+ PORT_BIT(0x0f, IP_ACTIVE_HIGH, IPT_UNUSED )
+
+ PORT_START("LINE1") /* KEY ROW 1 */
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("8") PORT_CODE(KEYCODE_8) PORT_CHAR('8')
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("9") PORT_CODE(KEYCODE_9) PORT_CHAR('9')
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("A") PORT_CODE(KEYCODE_A) PORT_CHAR('A')
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("B") PORT_CODE(KEYCODE_B) PORT_CHAR('B')
+ PORT_BIT(0xf0, IP_ACTIVE_HIGH, IPT_UNUSED )
+
+ PORT_START("LINE2") /* KEY ROW 2 */
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("4") PORT_CODE(KEYCODE_4) PORT_CHAR('4')
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("5") PORT_CODE(KEYCODE_5) PORT_CHAR('5')
+ PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("6") PORT_CODE(KEYCODE_6) PORT_CHAR('6')
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("7") PORT_CODE(KEYCODE_7) PORT_CHAR('7')
+ PORT_BIT(0x0f, IP_ACTIVE_HIGH, IPT_UNUSED )
+
+ PORT_START("LINE3") /* KEY ROW 3 */
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("0") PORT_CODE(KEYCODE_0) PORT_CHAR('0')
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("1") PORT_CODE(KEYCODE_1) PORT_CHAR('1')
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("2") PORT_CODE(KEYCODE_2) PORT_CHAR('2')
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("3") PORT_CODE(KEYCODE_3) PORT_CHAR('3')
+ PORT_BIT(0xf0, IP_ACTIVE_HIGH, IPT_UNUSED )
+
+ PORT_START("LINE4") /* Special KEY ROW for reset and Shift/'*' keys, they are hard wired */
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("*") PORT_CODE(KEYCODE_LSHIFT) PORT_CODE(KEYCODE_RSHIFT) PORT_CHAR('*') PORT_CHANGED_MEMBER(DEVICE_SELF, FUNC(mp68a_state::trigger_shift), 0)
+ //PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Reset") PORT_CODE(KEYCODE_F12)
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Reset") PORT_CODE(KEYCODE_F12) PORT_CHANGED_MEMBER(DEVICE_SELF, FUNC(mp68a_state::trigger_reset), 0)
+ PORT_BIT(0xf3, IP_ACTIVE_HIGH, IPT_UNUSED )
+INPUT_PORTS_END
+
+INPUT_CHANGED_MEMBER(didact_state::trigger_reset)
+{
+ if (newval == CLEAR_LINE)
+ {
+ LOGKBD("RESET is released, resetting the CPU\n");
+ machine_reset();
+ m_shift = 0;
+ m_led = 0;
+ }
+}
+
+
+void modulab_state::modulab(machine_config &config)
+{
+ m6802_cpu_device &maincpu(M6802(config, m_maincpu, XTAL(4'000'000)));
+ maincpu.set_ram_enable(false); // Schematics holds RAM enable low so that the M6802 internal RAM is disabled.
+ maincpu.set_addrmap(AS_PROGRAM, &modulab_state::modulab_map);
+ config.set_default_layout(layout_modulab);
+
+ /* Devices */
+ MM74C923(config, m_kb, 0);
+ m_kb->set_cap_osc(CAP_U(0.10));
+ m_kb->set_cap_debounce(CAP_U(1));
+ m_kb->da_wr_callback().set(FUNC(modulab_state::da_w));
+ m_kb->x1_rd_callback().set_ioport("LINE0");
+ m_kb->x2_rd_callback().set_ioport("LINE1");
+ m_kb->x3_rd_callback().set_ioport("LINE2");
+ m_kb->x4_rd_callback().set_ioport("LINE3");
+
+ /* PIA #1 0x????-0x??? - */
+ INS8154(config, m_pia1);
+ //m_ins8154->in_a().set(FUNC(modulab_state::ins8154_pa_r));
+ //m_ins8154->out_a().set(FUNC(modulab_state::ins8154_pa_w));
+
+ //RS232_PORT(config, m_rs232, default_rs232_devices, nullptr);
+}
+
+void md6802_state::md6802(machine_config &config)
+{
+ m6802_cpu_device &maincpu(M6802(config, m_maincpu, XTAL(4'000'000)));
+ maincpu.set_ram_enable(false);
+ maincpu.set_addrmap(AS_PROGRAM, &md6802_state::md6802_map);
+ config.set_default_layout(layout_md6802);
+
+ /* Devices */
+ TTL74145(config, m_tb16_74145, 0);
+ /* PIA #1 0xA000-0xA003 - used differently by laborations and loaded software */
+ PIA6821(config, m_pia1);
+
+ /* PIA #2 Keyboard & Display 0xC000-0xC003 */
+ PIA6821(config, m_pia2);
+ /* --PIA init----------------------- */
+ /* 0xE007 0xC002 (DDR B) = 0xFF - Port B all outputs and set to 0 (zero) */
+ /* 0xE00B 0xC000 (DDR A) = 0x70 - Port A three outputs and set to 0 (zero) */
+ /* 0xE00F 0xC001 (Control A) = 0x3C - */
+ /* 0xE013 0xC003 (Control B) = 0x3C - */
+ /* --execution-wait for key loop-- */
+ /* 0xE026 0xC000 = (Reading Port A) */
+ /* 0xE033 0xC000 = (Reading Port A) */
+ /* 0xE068 0xC000 (Port A) = 0x60 */
+ /* 0xE08A 0xC002 (Port B) = 0xEE - updating display */
+ /* 0xE090 0xC000 (Port A) = 0x00 - looping in 0x10,0x20,0x30,0x40,0x50 */
+ m_pia2->writepa_handler().set(FUNC(md6802_state::pia2_kbA_w));
+ m_pia2->readpa_handler().set(FUNC(md6802_state::pia2_kbA_r));
+ m_pia2->writepb_handler().set(FUNC(md6802_state::pia2_kbB_w));
+ m_pia2->readpb_handler().set(FUNC(md6802_state::pia2_kbB_r));
+ m_pia2->ca2_handler().set(FUNC(md6802_state::pia2_ca2_w));
+
+ RS232_PORT(config, m_rs232, default_rs232_devices, nullptr);
+}
+
+void mp68a_state::mp68a(machine_config &config)
+{
+ // Clock source is based on a N9602N Dual Retriggerable Resettable Monostable Multivibrator oscillator at aprox 505KHz.
+ // Trimpot seems broken/stuck at 5K Ohm thu. ROM code 1Ms delay loops suggest 1MHz+
+ M6800(config, m_maincpu, 505000);
+ m_maincpu->set_addrmap(AS_PROGRAM, &mp68a_state::mp68a_map);
+ config.set_default_layout(layout_mp68a);
+
+ /* Devices */
+ /* PIA #1 0x500-0x503 - used differently by laborations and loaded software */
+ PIA6821(config, m_pia1, 0); // actually 6820
+
+ /* PIA #2 Keyboard & Display 0x600-0x603 */
+ PIA6821(config, m_pia2, 0); // actually 6820
+ /* --PIA inits----------------------- */
+ /* 0x0BAF 0x601 (Control A) = 0x30 - CA2 is low and enable DDRA */
+ /* 0x0BB1 0x603 (Control B) = 0x30 - CB2 is low and enable DDRB */
+ /* 0x0BB5 0x600 (DDR A) = 0xFF - Port A all outputs and set to 0 (zero) */
+ /* 0x0BB9 0x602 (DDR B) = 0x50 - Port B two outputs and set to 0 (zero) */
+ /* 0x0BBD 0x601 (Control A) = 0x34 - CA2 is low and lock DDRA */
+ /* 0x0BBF 0x603 (Control B) = 0x34 - CB2 is low and lock DDRB */
+ /* 0x0BC3 0x602 (Port B) = 0x40 - Turn on display via RBI* on */
+ /* --execution-wait for key loop-- */
+ /* 0x086B Update display sequnc, see below */
+ /* 0x0826 CB1 read = 0x603 (Control B) - is a key pressed? */
+ m_pia2->writepa_handler().set(FUNC(mp68a_state::pia2_kbA_w));
+ m_pia2->readpa_handler().set(FUNC(mp68a_state::pia2_kbA_r));
+ m_pia2->writepb_handler().set(FUNC(mp68a_state::pia2_kbB_w));
+ m_pia2->readpb_handler().set(FUNC(mp68a_state::pia2_kbB_r));
+ m_pia2->readcb1_handler().set(FUNC(mp68a_state::pia2_cb1_r));
+ m_pia2->irqa_handler().set_inputline("maincpu", M6800_IRQ_LINE); /* Not used by ROM. Combined trace to CPU IRQ with IRQB */
+ m_pia2->irqb_handler().set_inputline("maincpu", M6800_IRQ_LINE); /* Not used by ROM. Combined trace to CPU IRQ with IRQA */
+
+ /* Display - sequence outputting all '0':s at start */
+ /* 0x086B 0x600 (Port A) = 0x00 */
+ /* 0x086B 0x600 (Port A) = 0x70 */
+ /* 0x086B 0x600 (Port A) = 0x10 */
+ /* 0x086B 0x600 (Port A) = 0x70 */
+ /* 0x086B 0x600 (Port A) = 0x20 */
+ /* 0x086B 0x600 (Port A) = 0x70 */
+ /* 0x086B 0x600 (Port A) = 0x30 */
+ /* 0x086B 0x600 (Port A) = 0x70 */
+ /* 0x086B 0x600 (Port A) = 0x40 */
+ /* 0x086B 0x600 (Port A) = 0x70 */
+ /* 0x086B 0x600 (Port A) = 0x50 */
+ /* 0x086B 0x600 (Port A) = 0x70 */
+ DM9368(config, m_digits[0]).update_cb().set(FUNC(mp68a_state::digit_w<0>));
+ DM9368(config, m_digits[1]).update_cb().set(FUNC(mp68a_state::digit_w<1>));
+ DM9368(config, m_digits[2]).update_cb().set(FUNC(mp68a_state::digit_w<2>));
+ DM9368(config, m_digits[3]).update_cb().set(FUNC(mp68a_state::digit_w<3>));
+ DM9368(config, m_digits[4]).update_cb().set(FUNC(mp68a_state::digit_w<4>));
+ DM9368(config, m_digits[5]).update_cb().set(FUNC(mp68a_state::digit_w<5>));
+
+ /* Cassette */
+ SPEAKER(config, "mono").front_center();
+ CASSETTE(config, m_cass);
+ m_cass->set_default_state(CASSETTE_STOPPED | CASSETTE_MOTOR_ENABLED | CASSETTE_SPEAKER_ENABLED);
+ m_cass->add_route(ALL_OUTPUTS, "mono", 0.05);
+}
+
+ROM_START( modulab )
+ ROM_REGION(0x10000, "maincpu", 0)
+ ROM_DEFAULT_BIOS("modulabvl")
+
+ ROM_SYSTEM_BIOS(0, "modulabv1", "Modulab Version 1")
+ ROMX_LOAD( "mlab1_00.bin", 0x0000, 0x0800, NO_DUMP, ROM_BIOS(0) )
+
+ ROM_SYSTEM_BIOS(1, "modulabv2", "Modulab Version 2")
+ ROMX_LOAD( "mlab2_00.bin", 0x0000, 0x0800, NO_DUMP, ROM_BIOS(1) )
+
+ ROM_SYSTEM_BIOS(2, "modulabvl", "Modulab Prototype")
+ ROMX_LOAD( "modulab_levererad.bin", 0x0000, 0x0800, CRC(40774ef4) SHA1(9cf188342993fbcff13dbbecc62d1ee49010d6f4), ROM_BIOS(2) )
+ROM_END
+
+// TODO split ROM image into proper ROM set
+ROM_START( md6802 ) // ROM image from http://elektronikforumet.com/forum/viewtopic.php?f=2&t=79576&start=135#p1203640
+ ROM_REGION(0x10000, "maincpu", 0)
+ ROM_LOAD( "didact.bin", 0xe000, 0x0800, CRC(50430b1d) SHA1(8e2172a9ae95b04f20aa14177df2463a286c8465) )
+ROM_END
+
+ROM_START( mp68a ) // ROM image from http://elektronikforumet.com/forum/viewtopic.php?f=2&t=79576&start=135#p1203640
+ ROM_REGION(0x10000, "maincpu", 0)
+ ROM_LOAD( "didacta.bin", 0x0800, 0x0200, CRC(aa05e1ce) SHA1(9ce8223efd274045b43ceca3529e037e16e99fdf) )
+ ROM_LOAD( "didactb.bin", 0x0a00, 0x0200, CRC(592898dc) SHA1(2962f4817712cae97f3ab37b088fc73e66535ff8) )
+ROM_END
+
+} // anonymous namespace
+
+
+// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS
+COMP( 1979, mp68a, 0, 0, mp68a, mp68a, mp68a_state, empty_init, "Didact AB", "mp68a", MACHINE_NO_SOUND_HW )
+COMP( 1983, md6802, 0, 0, md6802, md6802, md6802_state, empty_init, "Didact AB", "Mikrodator 6802", MACHINE_NO_SOUND_HW )
+COMP( 1984, modulab, 0, 0, modulab, modulab, modulab_state, empty_init, "Esselte Studium AB", "Modulab", MACHINE_NO_SOUND_HW )