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// license:BSD-3-Clause
// copyright-holders:R. Belmont
/*********************************************************************
a2thunderclock.c
Implemention of the Thunderware Thunderclock Plus.
PCB Layout: (B1/B2 are batteries)
_______________________________________________________________
| |
| | | | | uPD1990 CD4050 74LS174 74LS132 |
| | | | | _ _ _ _ _ |
| | | | | | | | | | | | | | | |
| | | | | |_| |_| |_| |_| |_| |
| B1 B2 74LS08 |
| 74LS74 74LS109 74LS126 ____________ 74LS27 |
| _ _ _ | | _ |
| | | | | | | | 2716 | | | |
| |_| |_| |_| |____________| |_| |
|______________________________________ _|
| |
|______________________|
*********************************************************************/
#include "emu.h"
#include "a2thunderclock.h"
#include "machine/upd1990a.h"
namespace {
/***************************************************************************
PARAMETERS
***************************************************************************/
#define THUNDERCLOCK_ROM_REGION "thunclk_rom"
#define THUNDERCLOCK_UPD1990_TAG "thunclk_upd"
ROM_START( thunderclock )
ROM_REGION(0x800, THUNDERCLOCK_ROM_REGION, 0)
ROM_LOAD( "thunderclock plus rom.bin", 0x0000, 0x0800, CRC(1b99c4e3) SHA1(60f434f5325899d7ea257a6e56e6f53eae65146a) )
ROM_END
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
class a2bus_thunderclock_device:
public device_t,
public device_a2bus_card_interface
{
public:
// construction/destruction
a2bus_thunderclock_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock);
protected:
a2bus_thunderclock_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, const XTAL &clock);
virtual void device_start() override;
virtual void device_reset() override;
virtual void device_add_mconfig(machine_config &config) override;
virtual const tiny_rom_entry *device_rom_region() const override;
// overrides of standard a2bus slot functions
virtual uint8_t read_c0nx(uint8_t offset) override;
virtual void write_c0nx(uint8_t offset, uint8_t data) override;
virtual uint8_t read_cnxx(uint8_t offset) override;
virtual uint8_t read_c800(uint16_t offset) override;
required_device<upd1990a_device> m_upd1990ac;
required_region_ptr<uint8_t> m_rom;
private:
DECLARE_WRITE_LINE_MEMBER( upd_dataout_w );
int m_dataout;
};
/***************************************************************************
FUNCTION PROTOTYPES
***************************************************************************/
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void a2bus_thunderclock_device::device_add_mconfig(machine_config &config)
{
UPD1990A(config, m_upd1990ac, 32.768_kHz_XTAL);
m_upd1990ac->data_callback().set(FUNC(a2bus_thunderclock_device::upd_dataout_w));
}
//-------------------------------------------------
// rom_region - device-specific ROM region
//-------------------------------------------------
const tiny_rom_entry *a2bus_thunderclock_device::device_rom_region() const
{
return ROM_NAME( thunderclock );
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
a2bus_thunderclock_device::a2bus_thunderclock_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, const XTAL &clock) :
device_t(mconfig, type, tag, owner, clock),
device_a2bus_card_interface(mconfig, *this),
m_upd1990ac(*this, THUNDERCLOCK_UPD1990_TAG),
m_rom(*this, THUNDERCLOCK_ROM_REGION),
m_dataout(0)
{
}
a2bus_thunderclock_device::a2bus_thunderclock_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) :
a2bus_thunderclock_device(mconfig, A2BUS_THUNDERCLOCK, tag, owner, clock)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void a2bus_thunderclock_device::device_start()
{
save_item(NAME(m_dataout));
}
void a2bus_thunderclock_device::device_reset()
{
m_dataout = 0;
}
/*-------------------------------------------------
read_c0nx - called for reads from this card's c0nx space
-------------------------------------------------*/
uint8_t a2bus_thunderclock_device::read_c0nx(uint8_t offset)
{
return (m_dataout << 7);
}
/*-------------------------------------------------
write_c0nx - called for writes to this card's c0nx space
-------------------------------------------------*/
void a2bus_thunderclock_device::write_c0nx(uint8_t offset, uint8_t data)
{
// uPD1990AC hookup:
// bit 0 = DATA IN?
// bit 1 = CLK
// bit 2 = STB
// bit 3 = C0
// bit 4 = C1
// bit 5 = C2
// bit 7 = data out
if (offset == 0)
{
m_upd1990ac->cs_w(1);
m_upd1990ac->oe_w(1);
m_upd1990ac->data_in_w(data&0x01);
m_upd1990ac->c0_w((data&0x08) >> 3);
m_upd1990ac->c1_w((data&0x10) >> 4);
m_upd1990ac->c2_w((data&0x20) >> 5);
m_upd1990ac->stb_w((data&0x04) >> 2);
m_upd1990ac->clk_w((data&0x02) >> 1);
}
}
/*-------------------------------------------------
read_cnxx - called for reads from this card's cnxx space
-------------------------------------------------*/
uint8_t a2bus_thunderclock_device::read_cnxx(uint8_t offset)
{
// ROM is primarily a c800 image, but the first page is also the CnXX ROM
return m_rom[offset];
}
/*-------------------------------------------------
read_c800 - called for reads from this card's c800 space
-------------------------------------------------*/
uint8_t a2bus_thunderclock_device::read_c800(uint16_t offset)
{
return m_rom[offset];
}
WRITE_LINE_MEMBER( a2bus_thunderclock_device::upd_dataout_w )
{
if (state)
{
m_dataout = 1;
}
else
{
m_dataout = 0;
}
}
} // anonymous namespace
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
DEFINE_DEVICE_TYPE_PRIVATE(A2BUS_THUNDERCLOCK, device_a2bus_card_interface, a2bus_thunderclock_device, "a2thunpl", "ThunderWare ThunderClock Plus")
|