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-rw-r--r--src/devices/bus/pasopia/rampac2.cpp151
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diff --git a/src/devices/bus/pasopia/rampac2.cpp b/src/devices/bus/pasopia/rampac2.cpp
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+// license:BSD-3-Clause
+// copyright-holders:AJR, Angelo Salese
+/****************************************************************************
+
+ Toshiba Pasopia RAM PAC2 emulation
+
+ This emulates the later, larger cartridges, but not the original 4K
+ model which used a 8255 PPI to latch the RAM address.
+
+****************************************************************************/
+
+#include "emu.h"
+#include "rampac2.h"
+
+//**************************************************************************
+// GLOBAL VARIABLES
+//**************************************************************************
+
+// device type definitions
+DEFINE_DEVICE_TYPE(PASOPIA_PA7243, pasopia_pa7243_device, "pa7243", "PA7243 Pasopia RAM PAC2 (16KB)")
+DEFINE_DEVICE_TYPE(PASOPIA_PA7245, pasopia_pa7245_device, "pa7245", "PA7245 Pasopia RAM PAC2 (32KB)")
+DEFINE_DEVICE_TYPE(PASOPIA_PA7248, pasopia_pa7248_device, "pa7248", "PA7248 Pasopia RAM PAC2 (64KB)")
+
+//**************************************************************************
+// DEVICE DEFINITION
+//**************************************************************************
+
+//-------------------------------------------------
+// pasopia_rampac2_device - construction
+//-------------------------------------------------
+
+pasopia_rampac2_device::pasopia_rampac2_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock, u32 ram_size)
+ : device_t(mconfig, type, tag, owner, clock)
+ , pac2_card_interface(mconfig, *this)
+ , device_nvram_interface(mconfig, *this)
+ , m_ram_size(ram_size)
+ , m_ram_index(0)
+{
+}
+
+
+//-------------------------------------------------
+// pasopia_pa7243_device - construction
+//-------------------------------------------------
+
+pasopia_pa7243_device::pasopia_pa7243_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+ : pasopia_rampac2_device(mconfig, PASOPIA_PA7243, tag, owner, clock, 0x4000)
+{
+}
+
+
+//-------------------------------------------------
+// pasopia_pa7245_device - construction
+//-------------------------------------------------
+
+pasopia_pa7245_device::pasopia_pa7245_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+ : pasopia_rampac2_device(mconfig, PASOPIA_PA7245, tag, owner, clock, 0x8000)
+{
+}
+
+
+//-------------------------------------------------
+// pasopia_pa7248_device - construction
+//-------------------------------------------------
+
+pasopia_pa7248_device::pasopia_pa7248_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+ : pasopia_rampac2_device(mconfig, PASOPIA_PA7248, tag, owner, clock, 0x10000)
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void pasopia_rampac2_device::device_start()
+{
+ m_ram = std::make_unique<u8[]>(m_ram_size);
+
+ save_pointer(NAME(m_ram), m_ram_size);
+ save_item(NAME(m_ram_index));
+}
+
+
+//-------------------------------------------------
+// nvram_read - read NVRAM from the file
+//-------------------------------------------------
+
+bool pasopia_rampac2_device::nvram_read(util::read_stream &file)
+{
+ auto const [err, actual] = read(file, &m_ram[0], m_ram_size);
+ return !err && (actual == m_ram_size);
+}
+
+
+//-------------------------------------------------
+// nvram_write - write NVRAM to the file
+//-------------------------------------------------
+
+bool pasopia_rampac2_device::nvram_write(util::write_stream &file)
+{
+ auto const [err, actual] = write(file, &m_ram[0], m_ram_size);
+ return !err;
+}
+
+
+//-------------------------------------------------
+// nvram_default - initialize NVRAM to its
+// default state
+//-------------------------------------------------
+
+void pasopia_rampac2_device::nvram_default()
+{
+ std::fill_n(&m_ram[0], m_ram_size, 0);
+}
+
+//**************************************************************************
+// PAC2 INTERFACE
+//**************************************************************************
+
+//-------------------------------------------------
+// pac2_read - I/O read access
+//-------------------------------------------------
+
+u8 pasopia_rampac2_device::pac2_read(offs_t offset)
+{
+ return m_ram[m_ram_index & (m_ram_size - 1)];
+}
+
+
+//-------------------------------------------------
+// pac2_write - I/O write access
+//-------------------------------------------------
+
+void pasopia_rampac2_device::pac2_write(offs_t offset, u8 data)
+{
+ switch (offset)
+ {
+ case 0:
+ m_ram_index = (m_ram_index & 0xff00) | (data & 0xff);
+ break;
+
+ case 1:
+ m_ram_index = (m_ram_index & 0xff) | ((data & 0xff) << 8);
+ break;
+
+ case 2: // PAC2 RAM write
+ m_ram[m_ram_index & (m_ram_size - 1)] = data;
+ break;
+ }
+}