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-rw-r--r--src/devices/bus/c64/sw8k.cpp114
1 files changed, 114 insertions, 0 deletions
diff --git a/src/devices/bus/c64/sw8k.cpp b/src/devices/bus/c64/sw8k.cpp
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index 00000000000..9b0cce8c55d
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+++ b/src/devices/bus/c64/sw8k.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Curt Coder
+/**********************************************************************
+
+ C64 switchable 8K cartridge emulation
+
+**********************************************************************/
+
+/*
+
+ 4040 + Fast Hack'em
+
+ PCB Layout
+ ----------
+
+ |===========================|
+ |=| |
+ |=| SW1 |
+ |=| ROM0 |
+ |=| |
+ |=| |
+ |=| ROM1 |
+ |=| |
+ |=| |
+ |===========================|
+
+ ROM0,1 - National Semiconductor NMC27C64Q 8Kx8 EPROM
+ SW1 - ROM selection switch
+
+*/
+
+#include "sw8k.h"
+
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type C64_SW8K = &device_creator<c64_switchable_8k_cartridge_device>;
+
+
+//-------------------------------------------------
+// INPUT_PORTS( c64_easyflash )
+//-------------------------------------------------
+
+static INPUT_PORTS_START( c64_switchable_8k )
+ PORT_START("SW")
+ PORT_DIPNAME( 0x01, 0x00, "ROM Select" )
+ PORT_DIPSETTING( 0x00, "ROM 0" )
+ PORT_DIPSETTING( 0x01, "ROM 1" )
+INPUT_PORTS_END
+
+
+//-------------------------------------------------
+// input_ports - device-specific input ports
+//-------------------------------------------------
+
+ioport_constructor c64_switchable_8k_cartridge_device::device_input_ports() const
+{
+ return INPUT_PORTS_NAME( c64_switchable_8k );
+}
+
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// c64_switchable_8k_cartridge_device - constructor
+//-------------------------------------------------
+
+c64_switchable_8k_cartridge_device::c64_switchable_8k_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ device_t(mconfig, C64_SW8K, "C64 Switchable 8K cartridge", tag, owner, clock, "c64_sw8k", __FILE__),
+ device_c64_expansion_card_interface(mconfig, *this),
+ m_sw(*this, "SW")
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void c64_switchable_8k_cartridge_device::device_start()
+{
+}
+
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void c64_switchable_8k_cartridge_device::device_reset()
+{
+ m_bank = m_sw->read();
+}
+
+
+//-------------------------------------------------
+// c64_cd_r - cartridge data read
+//-------------------------------------------------
+
+UINT8 c64_switchable_8k_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)
+ {
+ offs_t addr = (m_bank << 13) | (offset & 0x1fff);
+ data = m_roml[addr];
+ }
+
+ return data;
+}