summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/pitronics/beta.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/mame/pitronics/beta.cpp')
-rw-r--r--src/mame/pitronics/beta.cpp392
1 files changed, 392 insertions, 0 deletions
diff --git a/src/mame/pitronics/beta.cpp b/src/mame/pitronics/beta.cpp
new file mode 100644
index 00000000000..4fc624d47e4
--- /dev/null
+++ b/src/mame/pitronics/beta.cpp
@@ -0,0 +1,392 @@
+// license:BSD-3-Clause
+// copyright-holders:Curt Coder
+/***************************************************************************
+
+ Beta Computer
+
+ http://retro.hansotten.nl/index.php?page=beta-computer
+
+ When first started, press G to begin.
+
+ Pasting:
+ 0-F : as is
+ M (inc) : ^
+ AD : -
+ DA : =
+ GO : X
+
+ Test Paste:
+ X-0011=11^22^33^44^55^66^77^88^99^-0011
+ Now press M to confirm the data has been entered.
+
+****************************************************************************/
+
+/*
+
+ TODO:
+
+ - verify whether feeding a 0xff-filled 2K binary file as cart allows
+ to write back correctly EPROM or not
+
+*/
+
+#include "emu.h"
+
+#include "cpu/m6502/m6502.h"
+#include "imagedev/floppy.h"
+#include "machine/mos6530.h"
+#include "machine/ram.h"
+#include "sound/spkrdev.h"
+
+#include "bus/generic/slot.h"
+#include "bus/generic/carts.h"
+
+#include "speaker.h"
+
+#include "beta.lh"
+
+
+namespace {
+
+#define SCREEN_TAG "screen"
+#define M6502_TAG "m6502"
+#define M6532_TAG "m6532"
+#define EPROM_TAG "eprom"
+//#define SPEAKER_TAG "b237"
+
+class beta_state : public driver_device
+{
+public:
+ beta_state(const machine_config &mconfig, device_type type, const char *tag) :
+ driver_device(mconfig, type, tag),
+ m_maincpu(*this, M6502_TAG),
+ m_speaker(*this, "speaker"),
+ m_eprom(*this, EPROM_TAG),
+ m_q(*this, "Q%u", 6U),
+ m_digits(*this, "digit%u", 0U),
+ m_leds(*this, "led%u", 0U)
+ { }
+
+ DECLARE_INPUT_CHANGED_MEMBER( trigger_reset );
+ void beta(machine_config &config);
+
+protected:
+ virtual void machine_start() override ATTR_COLD;
+
+ uint8_t riot_pa_r();
+ void riot_pa_w(uint8_t data);
+ uint8_t riot_pb_r();
+ void riot_pb_w(uint8_t data);
+
+ DECLARE_DEVICE_IMAGE_LOAD_MEMBER(load_beta_eprom);
+ DECLARE_DEVICE_IMAGE_UNLOAD_MEMBER(unload_beta_eprom);
+
+ TIMER_CALLBACK_MEMBER(led_refresh);
+
+ void beta_mem(address_map &map) ATTR_COLD;
+
+private:
+ required_device<cpu_device> m_maincpu;
+ required_device<speaker_sound_device> m_speaker;
+ required_device<generic_slot_device> m_eprom;
+ required_ioport_array<4> m_q;
+ output_finder<6> m_digits;
+ output_finder<2> m_leds;
+
+ /* EPROM state */
+ int m_eprom_oe = 0;
+ int m_eprom_ce = 0;
+ uint16_t m_eprom_addr = 0;
+ uint8_t m_eprom_data = 0;
+ uint8_t m_old_data = 0;
+ std::vector<uint8_t> m_eprom_rom{};
+
+ /* display state */
+ uint8_t m_ls145_p = 0;
+ uint8_t m_segment = 0;
+
+ emu_timer *m_led_refresh_timer = nullptr;
+};
+
+
+/* Memory Maps */
+
+void beta_state::beta_mem(address_map &map)
+{
+ map(0x0000, 0x007f).mirror(0x7f00).m(M6532_TAG, FUNC(mos6532_device::ram_map));
+ map(0x0080, 0x00ff).mirror(0x7f00).m(M6532_TAG, FUNC(mos6532_device::io_map));
+ map(0x8000, 0x87ff).mirror(0x7800).rom();
+}
+
+/* Input Ports */
+
+INPUT_CHANGED_MEMBER( beta_state::trigger_reset )
+{
+ m_maincpu->set_input_line(INPUT_LINE_RESET, newval ? CLEAR_LINE : ASSERT_LINE);
+}
+
+static INPUT_PORTS_START( beta )
+ PORT_START("Q6")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_A) PORT_CHAR('A')
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_1) PORT_CHAR('1')
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_4) PORT_CHAR('4')
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_7) PORT_CHAR('7')
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("GO") PORT_CODE(KEYCODE_G) PORT_CODE(KEYCODE_X) PORT_CHAR('X')
+ PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )
+
+ PORT_START("Q7")
+ 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_2) PORT_CHAR('2')
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_5) PORT_CHAR('5')
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_8) PORT_CHAR('8')
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_M) PORT_CODE(KEYCODE_UP) PORT_CHAR('^')
+ PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )
+
+ PORT_START("Q8")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_B) PORT_CHAR('B')
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_3) PORT_CHAR('3')
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_6) PORT_CHAR('6')
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_9) PORT_CHAR('9')
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("DA") PORT_CODE(KEYCODE_EQUALS) PORT_CHAR('=')
+ PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )
+
+ PORT_START("Q9")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_C) PORT_CHAR('C')
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_D) PORT_CHAR('D')
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_E) PORT_CHAR('E')
+ 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("AD") PORT_CODE(KEYCODE_MINUS) PORT_CHAR('-')
+ PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )
+
+ PORT_START("SPECIAL")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("RESET") PORT_CODE(KEYCODE_R) PORT_CHANGED_MEMBER(DEVICE_SELF, FUNC(beta_state::trigger_reset), 0)
+INPUT_PORTS_END
+
+/* M6532 Interface */
+
+TIMER_CALLBACK_MEMBER(beta_state::led_refresh)
+{
+ if (m_ls145_p < 6)
+ m_digits[m_ls145_p] = m_segment;
+}
+
+uint8_t beta_state::riot_pa_r()
+{
+ /*
+
+ bit description
+
+ PA0 2716 D0, segment D, key bit 0
+ PA1 2716 D1, segment E, key bit 1
+ PA2 2716 D2, segment C, key bit 2
+ PA3 2716 D3, segment G, key bit 3
+ PA4 2716 D4, segment F, key bit 4
+ PA5 2716 D5, segment B
+ PA6 2716 D6, segment A
+ PA7 2716 D7
+
+ */
+
+ uint8_t data = 0xff;
+
+ switch (m_ls145_p)
+ {
+ case 6:
+ case 7:
+ case 8:
+ case 9:
+ data &= m_q[m_ls145_p - 6]->read();
+ break;
+ default:
+ if (!m_eprom_oe && !m_eprom_ce)
+ {
+ data = m_eprom_rom[m_eprom_addr & 0x7ff];
+ popmessage("EPROM read %04x = %02x\n", m_eprom_addr & 0x7ff, data);
+ }
+ }
+
+ return data;
+}
+
+void beta_state::riot_pa_w(uint8_t data)
+{
+ /*
+
+ bit description
+
+ PA0 2716 D0, segment D, key bit 0
+ PA1 2716 D1, segment E, key bit 1
+ PA2 2716 D2, segment C, key bit 2
+ PA3 2716 D3, segment G, key bit 3
+ PA4 2716 D4, segment F, key bit 4
+ PA5 2716 D5, segment B
+ PA6 2716 D6, segment A
+ PA7 2716 D7
+
+ */
+
+// logerror("PA %02x\n", data);
+
+ /* display */
+ m_segment = bitswap<8>(data, 7, 3, 4, 1, 0, 2, 5, 6) & 0x7f;
+ m_led_refresh_timer->adjust(attotime::from_usec(70));
+
+ /* EPROM data */
+ m_eprom_data = data;
+}
+
+uint8_t beta_state::riot_pb_r()
+{
+ return 0;
+}
+
+void beta_state::riot_pb_w(uint8_t data)
+{
+ /*
+
+ bit description
+
+ PB0 74LS145 P0
+ PB1 74LS145 P1
+ PB2 74LS145 P2
+ PB3 74LS145 P3, 74LS164 D
+ PB4 loudspeaker, data led
+ PB5 address led, 74LS164 CP
+ PB6 2716 _OE
+ PB7 2716 _CE
+
+ */
+
+ //logerror("PB %02x %02x\n", data, olddata);
+
+ /* display */
+ m_ls145_p = data & 0x0f;
+
+ /* speaker */
+ m_speaker->level_w(!BIT(data, 4));
+
+ /* address led */
+ m_leds[0] = BIT(data, 5);
+
+ /* data led */
+ m_leds[1] = !BIT(data, 5);
+
+ /* EPROM address shift */
+ if (!BIT(m_old_data, 5) && BIT(data, 5))
+ {
+ m_eprom_addr <<= 1;
+ m_eprom_addr |= BIT(m_old_data, 3);
+ }
+
+ /* EPROM output enable */
+ m_eprom_oe = BIT(data, 6);
+
+ /* EPROM chip enable */
+ m_eprom_ce = BIT(data, 7);
+
+ if (BIT(data, 6) && (!BIT(m_old_data, 7) && BIT(data, 7)))
+ {
+ popmessage("EPROM write %04x = %02x\n", m_eprom_addr & 0x7ff, m_eprom_data);
+ m_eprom_rom[m_eprom_addr & 0x7ff] &= m_eprom_data;
+ }
+
+ m_old_data = data;
+}
+
+/* EPROM socket */
+
+DEVICE_IMAGE_LOAD_MEMBER(beta_state::load_beta_eprom)
+{
+ uint32_t const size = m_eprom->common_get_size("rom");
+
+ if (size != 0x800)
+ return std::make_pair(image_error::INVALIDLENGTH, "Unsupported cartridge size (only 2K cartridges are supported)");
+
+ m_eprom->rom_alloc(size, GENERIC_ROM8_WIDTH, ENDIANNESS_LITTLE);
+ m_eprom->common_load_rom(m_eprom->get_rom_base(), size, "rom");
+
+ return std::make_pair(std::error_condition(), std::string());
+}
+
+DEVICE_IMAGE_UNLOAD_MEMBER(beta_state::unload_beta_eprom)
+{
+ if (!image.loaded_through_softlist())
+ image.fwrite(&m_eprom_rom[0], 0x800);
+}
+
+/* Machine Initialization */
+
+void beta_state::machine_start()
+{
+ m_digits.resolve();
+ m_leds.resolve();
+
+ m_led_refresh_timer = timer_alloc(FUNC(beta_state::led_refresh), this);
+
+ m_eprom_rom.resize(0x800);
+
+ if (!m_eprom->exists())
+ memset(&m_eprom_rom[0], 0xff, 0x800);
+ else
+ {
+ std::string region_tag;
+ memcpy(&m_eprom_rom[0], memregion(region_tag.assign(m_eprom->tag()).append(GENERIC_ROM_REGION_TAG).c_str())->base(), 0x800);
+ }
+
+ // state saving
+ save_item(NAME(m_eprom_oe));
+ save_item(NAME(m_eprom_ce));
+ save_item(NAME(m_eprom_addr));
+ save_item(NAME(m_eprom_data));
+ save_item(NAME(m_old_data));
+ save_item(NAME(m_eprom_rom));
+ save_item(NAME(m_ls145_p));
+ save_item(NAME(m_segment));
+}
+
+/* Machine Driver */
+
+void beta_state::beta(machine_config &config)
+{
+ /* basic machine hardware */
+ M6502(config, m_maincpu, XTAL(4'000'000)/4);
+ m_maincpu->set_addrmap(AS_PROGRAM, &beta_state::beta_mem);
+
+ /* video hardware */
+ config.set_default_layout(layout_beta);
+
+ /* sound hardware */
+ SPEAKER(config, "mono").front_center();
+ SPEAKER_SOUND(config, m_speaker).add_route(ALL_OUTPUTS, "mono", 0.25);
+
+ /* devices */
+ mos6532_device &m6532(MOS6532(config, M6532_TAG, XTAL(4'000'000)/4));
+ m6532.pa_rd_callback().set(FUNC(beta_state::riot_pa_r));
+ m6532.pa_wr_callback().set(FUNC(beta_state::riot_pa_w));
+ m6532.pb_rd_callback().set(FUNC(beta_state::riot_pb_r));
+ m6532.pb_wr_callback().set(FUNC(beta_state::riot_pb_w));
+ m6532.irq_wr_callback().set_inputline(m_maincpu, M6502_IRQ_LINE);
+
+ /* EPROM socket */
+ generic_cartslot_device &cartslot(GENERIC_CARTSLOT(config, EPROM_TAG, generic_plain_slot, nullptr, "bin,rom"));
+ cartslot.set_device_load(FUNC(beta_state::load_beta_eprom));
+ cartslot.set_device_unload(FUNC(beta_state::unload_beta_eprom));
+
+ /* internal ram */
+ RAM(config, RAM_TAG).set_default_size("256");
+}
+
+/* ROMs */
+
+ROM_START( beta )
+ ROM_REGION( 0x10000, M6502_TAG, 0 )
+ ROM_LOAD( "beta.rom", 0x8000, 0x0800, CRC(d42fdb17) SHA1(595225a0cd43dd76c46b2aff6c0f27d5991cc4f0))
+ROM_END
+
+} // anonymous namespace
+
+
+/* System Drivers */
+
+// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS
+COMP( 1984, beta, 0, 0, beta, beta, beta_state, empty_init, "Pitronics", "Beta", MACHINE_SUPPORTS_SAVE )