diff options
Diffstat (limited to 'src/devices/bus/bbc/1mhzbus/ramdisc.h')
-rw-r--r-- | src/devices/bus/bbc/1mhzbus/ramdisc.h | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/src/devices/bus/bbc/1mhzbus/ramdisc.h b/src/devices/bus/bbc/1mhzbus/ramdisc.h new file mode 100644 index 00000000000..52b26284e06 --- /dev/null +++ b/src/devices/bus/bbc/1mhzbus/ramdisc.h @@ -0,0 +1,60 @@ +// license:BSD-3-Clause +// copyright-holders:Nigel Barnes +/********************************************************************** + + Morley Electronics RAM Disc + +**********************************************************************/ + + +#ifndef MAME_BUS_BBC_1MHZBUS_RAMDISC_H +#define MAME_BUS_BBC_1MHZBUS_RAMDISC_H + +#include "1mhzbus.h" +#include "machine/nvram.h" + +//************************************************************************** +// TYPE DEFINITIONS +//************************************************************************** + +class bbc_ramdisc_device: + public device_t, + public device_bbc_1mhzbus_interface +{ +public: + // construction/destruction + bbc_ramdisc_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); + + DECLARE_INPUT_CHANGED_MEMBER(power_changed); + +protected: + // device-level overrides + virtual void device_start() override; + + // optional information overrides + virtual void device_add_mconfig(machine_config &config) override; + virtual ioport_constructor device_input_ports() const override; + virtual const tiny_rom_entry *device_rom_region() const override; + + virtual uint8_t fred_r(offs_t offset) override; + virtual void fred_w(offs_t offset, uint8_t data) override; + virtual uint8_t jim_r(offs_t offset) override; + virtual void jim_w(offs_t offset, uint8_t data) override; + +private: + static const size_t RAM_SIZE = 0x200000; + + required_device<bbc_1mhzbus_slot_device> m_1mhzbus; + required_device<nvram_device> m_nvram; + required_ioport m_power; + + std::unique_ptr<uint8_t[]> m_ram; + uint16_t m_sector; +}; + + +// device type definition +DECLARE_DEVICE_TYPE(BBC_RAMDISC, bbc_ramdisc_device); + + +#endif /* MAME_BUS_BBC_1MHZBUS_RAMDISC_H */ |