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author Miodrag Milanovic <mmicko@gmail.com>2012-08-21 10:41:19 +0000
committer Miodrag Milanovic <mmicko@gmail.com>2012-08-21 10:41:19 +0000
commit7285b359d259b2ae0fdf85096571c386ec8c991a (patch)
treea027aff57f1a255f9ec6cfd3b68cabe4b6683998 /src/mess/machine/c64_sw8k.c
parent67c425e90757876a6716b7867df30c0149912e74 (diff)
Merge of MESS sources (no whatsnew)
Diffstat (limited to 'src/mess/machine/c64_sw8k.c')
-rw-r--r--src/mess/machine/c64_sw8k.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/src/mess/machine/c64_sw8k.c b/src/mess/machine/c64_sw8k.c
new file mode 100644
index 00000000000..848a78d229e
--- /dev/null
+++ b/src/mess/machine/c64_sw8k.c
@@ -0,0 +1,116 @@
+/**********************************************************************
+
+ C64 switchable 8K cartridge emulation
+
+ Copyright MESS Team.
+ Visit http://mamedev.org for licensing and usage restrictions.
+
+**********************************************************************/
+
+/*
+
+ 4040 + Fast Hack'em
+
+ PCB Layout
+ ----------
+
+ |===========================|
+ |=| |
+ |=| SW1 |
+ |=| ROM0 |
+ |=| |
+ |=| |
+ |=| ROM1 |
+ |=| |
+ |=| |
+ |===========================|
+
+ ROM0,1 - National Semiconductor NMC27C64Q 8Kx8 EPROM
+ SW1 - ROM selection switch
+
+*/
+
+#include "c64_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),
+ device_c64_expansion_card_interface(mconfig, *this)
+{
+}
+
+
+//-------------------------------------------------
+// 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 = ioport("SW")->read();
+}
+
+
+//-------------------------------------------------
+// c64_cd_r - cartridge data read
+//-------------------------------------------------
+
+UINT8 c64_switchable_8k_cartridge_device::c64_cd_r(address_space &space, offs_t offset, int ba, int roml, int romh, int io1, int io2)
+{
+ UINT8 data = 0;
+
+ if (!roml)
+ {
+ offs_t addr = (m_bank << 13) | (offset & 0x1fff);
+ data = m_roml[addr];
+ }
+
+ return data;
+}