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Diffstat (limited to 'src/devices/bus/bbc/internal/overlay.h')
-rw-r--r-- | src/devices/bus/bbc/internal/overlay.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/src/devices/bus/bbc/internal/overlay.h b/src/devices/bus/bbc/internal/overlay.h new file mode 100644 index 00000000000..1c11fe9cd18 --- /dev/null +++ b/src/devices/bus/bbc/internal/overlay.h @@ -0,0 +1,57 @@ +// 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, uint32_t clock); + +protected: + // device-level overrides + virtual void device_start() override ATTR_COLD; + + // optional information overrides + virtual void device_add_mconfig(machine_config &config) override ATTR_COLD; + virtual ioport_constructor device_input_ports() const override ATTR_COLD; + + 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<bbc_romslot_device, 3> 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 */ |