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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/**********************************************************************
Aries B12 Sideways ROM Expansion
http://chrisacorns.computinghistory.org.uk/8bit_Upgrades/Aries_B12.html
Aries B20 20K RAM expansion
http://chrisacorns.computinghistory.org.uk/8bit_Upgrades/Aries_B20.html
Aries-B32 32K RAM expansion
http://chrisacorns.computinghistory.org.uk/8bit_Upgrades/Aries_B32.html
**********************************************************************/
#ifndef MAME_BUS_BBC_INTERNAL_ARIES_H
#define MAME_BUS_BBC_INTERNAL_ARIES_H
#include "internal.h"
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
class bbc_ariesb12_device :
public device_t,
public device_bbc_internal_interface
{
public:
// construction/destruction
bbc_ariesb12_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
protected:
bbc_ariesb12_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock);
// device-level overrides
virtual void device_start() override;
// optional information overrides
virtual void device_add_mconfig(machine_config &config) override;
virtual bool overrides_rom() override { return true; }
virtual void romsel_w(offs_t offset, uint8_t data) override { m_romsel = data & 0x0f; }
virtual uint8_t paged_r(offs_t offset) override;
virtual void paged_w(offs_t offset, uint8_t data) override;
optional_device_array<bbc_romslot_device, 16> m_rom;
uint8_t m_romsel = 0;
};
class bbc_ariesb20_device : public bbc_ariesb12_device
{
public:
// construction/destruction
bbc_ariesb20_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
// optional information overrides
virtual const tiny_rom_entry *device_rom_region() const override;
virtual bool overrides_ram() override { return true; }
virtual uint8_t ram_r(offs_t offset) override;
virtual void ram_w(offs_t offset, uint8_t data) override;
private:
void control_w(offs_t offset, uint8_t data);
bool m_shadow = false;
std::unique_ptr<uint8_t[]> m_ram;
};
class bbc_ariesb32_device : public bbc_ariesb12_device
{
public:
// construction/destruction
bbc_ariesb32_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
protected:
// device-level overrides
virtual void device_start() override;
// optional information overrides
virtual void device_add_mconfig(machine_config &config) override;
virtual const tiny_rom_entry *device_rom_region() const override;
virtual bool overrides_ram() override { return true; }
virtual uint8_t ram_r(offs_t offset) override;
virtual void ram_w(offs_t offset, uint8_t data) override;
virtual void romsel_w(offs_t offset, uint8_t data) override;
virtual uint8_t paged_r(offs_t offset) override;
virtual void paged_w(offs_t offset, uint8_t data) override;
private:
required_memory_region m_aries_rom;
bool m_shadow = false;
std::unique_ptr<uint8_t[]> m_ram;
uint8_t m_ramsel = 0;
};
// device type definition
DECLARE_DEVICE_TYPE(BBC_ARIESB12, bbc_ariesb12_device);
DECLARE_DEVICE_TYPE(BBC_ARIESB20, bbc_ariesb20_device);
DECLARE_DEVICE_TYPE(BBC_ARIESB32, bbc_ariesb32_device);
#endif /* MAME_BUS_BBC_INTERNAL_ARIES_H */
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