diff options
Diffstat (limited to 'src/devices/bus/bbc/internal/aries.h')
-rw-r--r-- | src/devices/bus/bbc/internal/aries.h | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/src/devices/bus/bbc/internal/aries.h b/src/devices/bus/bbc/internal/aries.h new file mode 100644 index 00000000000..9dc7383ff21 --- /dev/null +++ b/src/devices/bus/bbc/internal/aries.h @@ -0,0 +1,117 @@ +// 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; +}; + + +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; + 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; + std::unique_ptr<uint8_t[]> m_ram; + uint8_t m_ramsel; +}; + + +// 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 */ |