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Diffstat (limited to 'src/devices/bus/a2bus/prodosromdrive.cpp')
-rw-r--r--src/devices/bus/a2bus/prodosromdrive.cpp119
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diff --git a/src/devices/bus/a2bus/prodosromdrive.cpp b/src/devices/bus/a2bus/prodosromdrive.cpp
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+// license:BSD-3-Clause
+// copyright-holders:R. Belmont
+/*********************************************************************
+
+ prodosromdrive.cpp
+
+ Implementation of the ProDOS ROM Drive card
+
+ This is a hobbyist board which provides a minimal SmartPort API
+ interface to boot from a 1 MiB disk image stored in a 27C080 or
+ compatible EPROM.
+
+ Board and firmware by Terence J. Boldt
+ http://apple2.ca/
+ https://github.com/tjboldt/ProDOS-ROM-Drive
+
+ The firmware requires a IIe or better, and some of the games
+ included require a 65C02 (enhanced IIe).
+
+*********************************************************************/
+
+#include "emu.h"
+#include "prodosromdrive.h"
+
+namespace {
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+class a2bus_pdromdrive_device : public device_t,
+ public device_a2bus_card_interface
+{
+public:
+ // construction/destruction
+ a2bus_pdromdrive_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+protected:
+ a2bus_pdromdrive_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock);
+
+ virtual void device_start() override;
+ virtual const tiny_rom_entry *device_rom_region() const override;
+
+ // overrides of standard a2bus slot functions
+ virtual uint8_t read_c0nx(uint8_t offset) override;
+ virtual void write_c0nx(uint8_t offset, uint8_t data) override;
+ virtual uint8_t read_cnxx(uint8_t offset) override;
+
+private:
+ required_region_ptr<u8> m_rom;
+
+ u16 m_latch;
+};
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+a2bus_pdromdrive_device::a2bus_pdromdrive_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
+ a2bus_pdromdrive_device(mconfig, A2BUS_PRODOSROMDRIVE, tag, owner, clock)
+{
+}
+
+a2bus_pdromdrive_device::a2bus_pdromdrive_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock) :
+ device_t(mconfig, type, tag, owner, clock),
+ device_a2bus_card_interface(mconfig, *this),
+ m_rom(*this, "romdrive")
+{
+}
+
+void a2bus_pdromdrive_device::device_start()
+{
+ save_item(NAME(m_latch));
+}
+
+ROM_START( pdromdrive )
+ ROM_REGION(0x100000, "romdrive", 0)
+ ROM_LOAD( "gameswithfirmware.bin", 0x000000, 0x100000, CRC(a1efd23b) SHA1(f0733b7a68126adc5247a1008de2ea4f65ad645a) )
+ROM_END
+
+const tiny_rom_entry *a2bus_pdromdrive_device::device_rom_region() const
+{
+ return ROM_NAME(pdromdrive);
+}
+
+uint8_t a2bus_pdromdrive_device::read_c0nx(uint8_t offset)
+{
+ return m_rom[(m_latch << 4) | (offset & 0xf)];
+}
+
+void a2bus_pdromdrive_device::write_c0nx(uint8_t offset, uint8_t data)
+{
+ switch (offset)
+ {
+ case 0:
+ m_latch &= 0xff00;
+ m_latch |= data;
+ break;
+
+ case 1:
+ m_latch &= 0x00ff;
+ m_latch |= (data << 8);
+ break;
+ }
+}
+
+uint8_t a2bus_pdromdrive_device::read_cnxx(uint8_t offset)
+{
+ return m_rom[offset + 0x300];
+}
+
+} // anonymous namespace
+
+
+//**************************************************************************
+// GLOBAL VARIABLES
+//**************************************************************************
+
+DEFINE_DEVICE_TYPE_PRIVATE(A2BUS_PRODOSROMDRIVE, device_a2bus_card_interface, a2bus_pdromdrive_device, "a2pdromdr", "ProDOS ROM Drive")