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-rw-r--r--src/devices/bus/c64/ocean.cpp115
1 files changed, 115 insertions, 0 deletions
diff --git a/src/devices/bus/c64/ocean.cpp b/src/devices/bus/c64/ocean.cpp
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+++ b/src/devices/bus/c64/ocean.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Curt Coder
+/**********************************************************************
+
+ Ocean Software cartridge emulation
+
+**********************************************************************/
+
+/*
+
+ Chase H.Q. 2: Special Criminal Investigation
+
+ PCB Layout
+ ----------
+
+ |===========================|
+ |=| LS02 |
+ |=| |
+ |=| |
+ |=| ROM0 ROM1 |
+ |=| LS273 |
+ |=| |
+ |=| |
+ |=| |
+ |===========================|
+
+ ROM0,1 - 28-pin ROM (Toshiba TC531000 pinout, markings scratched off)
+
+*/
+
+#include "ocean.h"
+
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type C64_OCEAN = &device_creator<c64_ocean_cartridge_device>;
+
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// c64_ocean_cartridge_device - constructor
+//-------------------------------------------------
+
+c64_ocean_cartridge_device::c64_ocean_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ device_t(mconfig, C64_OCEAN, "C64 Ocean cartridge", tag, owner, clock, "c64_ocean", __FILE__),
+ device_c64_expansion_card_interface(mconfig, *this),
+ m_bank(0)
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void c64_ocean_cartridge_device::device_start()
+{
+ // state saving
+ save_item(NAME(m_bank));
+}
+
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void c64_ocean_cartridge_device::device_reset()
+{
+ m_bank = 0;
+}
+
+
+//-------------------------------------------------
+// c64_cd_r - cartridge data read
+//-------------------------------------------------
+
+UINT8 c64_ocean_cartridge_device::c64_cd_r(address_space &space, offs_t offset, UINT8 data, int sphi2, int ba, int roml, int romh, int io1, int io2)
+{
+ if (!roml && m_roml.bytes())
+ {
+ offs_t addr = (m_bank << 13) | (offset & 0x1fff);
+ data = m_roml[addr & m_roml.mask()];
+ }
+ else if (!romh && m_romh.bytes())
+ {
+ offs_t addr = (m_bank << 13) | (offset & 0x1fff);
+ data = m_romh[addr & m_romh.mask()];
+ }
+ else if (!io1)
+ {
+ return m_bank;
+ }
+
+ return data;
+}
+
+
+//-------------------------------------------------
+// c64_cd_w - cartridge data write
+//-------------------------------------------------
+
+void c64_ocean_cartridge_device::c64_cd_w(address_space &space, offs_t offset, UINT8 data, int sphi2, int ba, int roml, int romh, int io1, int io2)
+{
+ if (!io1)
+ {
+ m_bank = data & 0x3f;
+ }
+}