einstein: Add support for the Silicon Disc RAM drive
Enable it with "-pipe silicon_disc" and use it as drive 3.master
Dirk Best
parent
e40f2551aa
commit
58b5eab4a8
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@ -3298,6 +3298,8 @@ if (BUSES["TATUNG_PIPE"]~=null) then
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files {
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MAME_DIR .. "src/devices/bus/einstein/pipe/pipe.cpp",
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MAME_DIR .. "src/devices/bus/einstein/pipe/pipe.h",
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MAME_DIR .. "src/devices/bus/einstein/pipe/silicon_disc.cpp",
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MAME_DIR .. "src/devices/bus/einstein/pipe/silicon_disc.h",
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MAME_DIR .. "src/devices/bus/einstein/pipe/tk02.cpp",
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MAME_DIR .. "src/devices/bus/einstein/pipe/tk02.h",
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}
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@ -10,6 +10,7 @@
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#include "pipe.h"
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// supported devices
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#include "silicon_disc.h"
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#include "tk02.h"
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@ -115,5 +116,6 @@ device_tatung_pipe_interface::~device_tatung_pipe_interface()
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//**************************************************************************
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SLOT_INTERFACE_START( tatung_pipe_cards )
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SLOT_INTERFACE("silicon_disc", EINSTEIN_SILICON_DISC)
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SLOT_INTERFACE("tk02", TK02_80COL)
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SLOT_INTERFACE_END
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@ -0,0 +1,119 @@
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// license: GPL-2.0+
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// copyright-holders: Dirk Best
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/***************************************************************************
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Silicon Disc
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***************************************************************************/
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#include "emu.h"
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#include "silicon_disc.h"
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//**************************************************************************
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// DEVICE DEFINITIONS
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//**************************************************************************
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DEFINE_DEVICE_TYPE(EINSTEIN_SILICON_DISC, einstein_silicon_disc_device, "einstein_sd", "Einstein Silicon Disc")
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//-------------------------------------------------
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// device_address_map
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//-------------------------------------------------
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DEVICE_ADDRESS_MAP_START(map, 8, einstein_silicon_disc_device)
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AM_RANGE(0x08, 0x08) AM_MIRROR(0xff00) AM_WRITE(sector_low_w)
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AM_RANGE(0x09, 0x09) AM_MIRROR(0xff00) AM_WRITE(sector_high_w)
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ADDRESS_MAP_END
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//-------------------------------------------------
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// rom_region - device-specific ROM region
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//-------------------------------------------------
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ROM_START( silicon_disc )
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ROM_REGION(0x2000, "rom", 0)
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ROM_LOAD("sd11.bin", 0x0000, 0x2000, CRC(0e4f5e6d) SHA1(d0bc01e533d8963c596154435c5b2d156a96d470))
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ROM_END
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const tiny_rom_entry *einstein_silicon_disc_device::device_rom_region() const
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{
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return ROM_NAME( silicon_disc );
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}
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//**************************************************************************
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// LIVE DEVICE
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//**************************************************************************
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//-------------------------------------------------
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// einstein_silicon_disc_device - constructor
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//-------------------------------------------------
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einstein_silicon_disc_device::einstein_silicon_disc_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
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device_t(mconfig, EINSTEIN_SILICON_DISC, tag, owner, clock),
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device_tatung_pipe_interface(mconfig, *this),
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m_rom(*this, "rom"),
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m_bios(*this, ":bios"),
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m_sector(0)
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{
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}
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//-------------------------------------------------
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// device_start - device-specific startup
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//-------------------------------------------------
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void einstein_silicon_disc_device::device_start()
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{
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// setup ram
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m_ram = std::make_unique<uint8_t[]>(0x40000);
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memset(m_ram.get(), 0xff, 0x40000);
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// register for save states
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save_pointer(NAME(m_ram.get()), 0x40000);
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save_item(NAME(m_sector));
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}
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//-------------------------------------------------
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// device_reset - device-specific reset
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//-------------------------------------------------
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void einstein_silicon_disc_device::device_reset()
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{
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// copy our rom into the main bios region so it will get picked up by the bank switching
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// not really part of the pipe interface cartridge but here for convenience, in reality
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// the rom gets put directly onto the main motherboard into the second empty socket
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memcpy(m_bios->base() + 0x4000, m_rom->base(), 0x2000);
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// install i/o ports
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io_space().install_device(0xf0, 0xff, *this, &einstein_silicon_disc_device::map);
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io_space().install_readwrite_handler(0xfa, 0xfa, 0, 0, 0xff00,
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read8_delegate(FUNC(einstein_silicon_disc_device::ram_r), this),
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write8_delegate(FUNC(einstein_silicon_disc_device::ram_w), this));
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}
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//**************************************************************************
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// IMPLEMENTATION
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//**************************************************************************
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WRITE8_MEMBER( einstein_silicon_disc_device::sector_low_w )
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{
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m_sector &= 0xff00;
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m_sector |= data;
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}
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WRITE8_MEMBER( einstein_silicon_disc_device::sector_high_w )
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{
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m_sector &= 0x00ff;
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m_sector |= ((data & 0x07) << 8);
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}
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// a8 to a14 are used to specify the byte in a 128-byte sector
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READ8_MEMBER( einstein_silicon_disc_device::ram_r )
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{
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return m_ram[(m_sector * 0x80) | ((offset >> 8) & 0x7f)];
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}
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WRITE8_MEMBER( einstein_silicon_disc_device::ram_w )
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{
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m_ram[(m_sector * 0x80) | ((offset >> 8) & 0x7f)] = data;
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}
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@ -0,0 +1,54 @@
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// license: GPL-2.0+
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// copyright-holders: Dirk Best
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/***************************************************************************
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Silicon Disc
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A 256k RAM drive that gets accessed as drive 3.
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***************************************************************************/
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#ifndef MAME_BUS_EINSTEIN_SILICON_DISC_H
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#define MAME_BUS_EINSTEIN_SILICON_DISC_H
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#pragma once
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#include "pipe.h"
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//**************************************************************************
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// TYPE DEFINITIONS
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//**************************************************************************
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// ======================> einstein_silicon_disc_device
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class einstein_silicon_disc_device : public device_t, public device_tatung_pipe_interface
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{
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public:
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// construction/destruction
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einstein_silicon_disc_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
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DECLARE_WRITE8_MEMBER(sector_low_w);
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DECLARE_WRITE8_MEMBER(sector_high_w);
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DECLARE_READ8_MEMBER(ram_r);
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DECLARE_WRITE8_MEMBER(ram_w);
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protected:
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virtual const tiny_rom_entry *device_rom_region() const override;
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virtual void device_start() override;
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virtual void device_reset() override;
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private:
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DECLARE_ADDRESS_MAP(map, 8);
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required_memory_region m_rom;
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required_memory_region m_bios;
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std::unique_ptr<uint8_t[]> m_ram;
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uint16_t m_sector;
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};
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// device type definition
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DECLARE_DEVICE_TYPE(EINSTEIN_SILICON_DISC, einstein_silicon_disc_device)
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#endif // MAME_BUS_EINSTEIN_SILICON_DISC_H
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