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// license:BSD-3-Clause
// copyright-holders:R. Belmont
/*********************************************************************
prodosromdrive.cpp
Implementation of the ProDOS ROM Drive card
This is a hobbyist board which provides a minimal SmartPort API
interface to boot from a 1 MiB disk image stored in a 27C080 or
compatible EPROM.
Board and firmware by Terence J. Boldt
http://apple2.ca/
https://github.com/tjboldt/ProDOS-ROM-Drive
The firmware requires a IIe or better, and some of the games
included require a 65C02 (enhanced IIe).
*********************************************************************/
#include "emu.h"
#include "prodosromdrive.h"
namespace {
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
class a2bus_pdromdrive_device : public device_t,
public device_a2bus_card_interface
{
public:
// construction/destruction
a2bus_pdromdrive_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock);
protected:
a2bus_pdromdrive_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, const XTAL &clock);
virtual void device_start() 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;
private:
required_region_ptr<u8> m_rom;
u16 m_latch;
};
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
a2bus_pdromdrive_device::a2bus_pdromdrive_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) :
a2bus_pdromdrive_device(mconfig, A2BUS_PRODOSROMDRIVE, tag, owner, clock)
{
}
a2bus_pdromdrive_device::a2bus_pdromdrive_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_rom(*this, "romdrive")
{
}
void a2bus_pdromdrive_device::device_start()
{
save_item(NAME(m_latch));
}
ROM_START( pdromdrive )
ROM_REGION(0x100000, "romdrive", 0)
ROM_LOAD( "gameswithfirmware.bin", 0x000000, 0x100000, CRC(a1efd23b) SHA1(f0733b7a68126adc5247a1008de2ea4f65ad645a) )
ROM_END
const tiny_rom_entry *a2bus_pdromdrive_device::device_rom_region() const
{
return ROM_NAME(pdromdrive);
}
uint8_t a2bus_pdromdrive_device::read_c0nx(uint8_t offset)
{
return m_rom[(m_latch << 4) | (offset & 0xf)];
}
void a2bus_pdromdrive_device::write_c0nx(uint8_t offset, uint8_t data)
{
switch (offset)
{
case 0:
m_latch &= 0xff00;
m_latch |= data;
break;
case 1:
m_latch &= 0x00ff;
m_latch |= (data << 8);
break;
}
}
uint8_t a2bus_pdromdrive_device::read_cnxx(uint8_t offset)
{
return m_rom[offset + 0x300];
}
} // anonymous namespace
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
DEFINE_DEVICE_TYPE_PRIVATE(A2BUS_PRODOSROMDRIVE, device_a2bus_card_interface, a2bus_pdromdrive_device, "a2pdromdr", "ProDOS ROM Drive")
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