// 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/mos6530n.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"
#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;
DECLARE_READ8_MEMBER( riot_pa_r );
DECLARE_WRITE8_MEMBER( riot_pa_w );
DECLARE_READ8_MEMBER( riot_pb_r );
DECLARE_WRITE8_MEMBER( riot_pb_w );
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);
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;
int m_eprom_ce;
uint16_t m_eprom_addr;
uint8_t m_eprom_data;
uint8_t m_old_data;
std::vector<uint8_t> m_eprom_rom;
/* display state */
uint8_t m_ls145_p;
uint8_t m_segment;
emu_timer *m_led_refresh_timer;
};
/* Memory Maps */
void beta_state::beta_mem(address_map &map)
{
map(0x0000, 0x007f).mirror(0x7f00).m(M6532_TAG, FUNC(mos6532_new_device::ram_map));
map(0x0080, 0x00ff).mirror(0x7f00).m(M6532_TAG, FUNC(mos6532_new_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, 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;
}
READ8_MEMBER( 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;
}
WRITE8_MEMBER( beta_state::riot_pa_w )
{
/*
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;
}
READ8_MEMBER( beta_state::riot_pb_r )
{
return 0;
}
WRITE8_MEMBER( beta_state::riot_pb_w )
{
/*
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 size = m_eprom->common_get_size("rom");
if (size != 0x800)
{
image.seterror(IMAGE_ERROR_UNSPECIFIED, "Unsupported cartridge size");
return image_init_result::FAIL;
}
m_eprom->rom_alloc(size, GENERIC_ROM8_WIDTH, ENDIANNESS_LITTLE);
m_eprom->common_load_rom(m_eprom->get_rom_base(), size, "rom");
return image_init_result::PASS;
}
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 = machine().scheduler().timer_alloc(timer_expired_delegate(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_new_device &m6532(MOS6532_NEW(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
/* 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 )