// license:BSD-3-Clause // copyright-holders:Nigel Barnes /********************************************************************** Vine Micros Romboard '3' (Master OS Overlay Board) http://chrisacorns.computinghistory.org.uk/8bit_Upgrades/Vine_MasterOSoverlay.html **********************************************************************/ #ifndef MAME_BUS_BBC_INTERNAL_OVERLAY_H #define MAME_BUS_BBC_INTERNAL_OVERLAY_H #include "internal.h" //************************************************************************** // TYPE DEFINITIONS //************************************************************************** class bbc_overlay_device : public device_t, public device_bbc_internal_interface { public: // construction/destruction bbc_overlay_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock); 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 bool overrides_rom() override { return true; } virtual bool overrides_mos() 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; virtual uint8_t mos_r(offs_t offset) override; private: required_device_array m_rom; required_ioport_array<3> m_link_rom; uint8_t m_romsel; }; // device type definition DECLARE_DEVICE_TYPE(BBC_OVERLAY, bbc_overlay_device); #endif /* MAME_BUS_BBC_INTERNAL_OVERLAY_H */