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Diffstat (limited to 'src/devices/bus/c64/vizastar.c')
-rw-r--r--src/devices/bus/c64/vizastar.c89
1 files changed, 89 insertions, 0 deletions
diff --git a/src/devices/bus/c64/vizastar.c b/src/devices/bus/c64/vizastar.c
new file mode 100644
index 00000000000..d635ffec656
--- /dev/null
+++ b/src/devices/bus/c64/vizastar.c
@@ -0,0 +1,89 @@
+// license:BSD-3-Clause
+// copyright-holders:Curt Coder
+/**********************************************************************
+
+ VizaStar 64 XL4 cartridge emulation
+
+**********************************************************************/
+
+/*
+
+ PCB Layout
+ ----------
+ RB84 (C) MICROPORT
+ |===========================|
+ |=| |
+ |=| |
+ |=| |
+ |=| |
+ |=| ROM |
+ |=| |
+ |=| |
+ |=| |
+ |===========================|
+
+ ROM - Hitachi HN462732G 4Kx8 EPROM "V"
+
+*/
+
+#include "vizastar.h"
+
+
+
+//**************************************************************************
+// MACROS/CONSTANTS
+//**************************************************************************
+
+#define UNSCRAMBLE_ADDRESS(_offset) \
+ BITSWAP16(_offset,15,14,13,12,5,0,7,10,11,9,8,6,4,3,2,1)
+
+#define UNSCRAMBLE_DATA(_data) \
+ BITSWAP8(_data,7,6,0,5,1,4,2,3)
+
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type C64_VIZASTAR = &device_creator<c64_vizastar_cartridge_device>;
+
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// c64_vizastar_cartridge_device - constructor
+//-------------------------------------------------
+
+c64_vizastar_cartridge_device::c64_vizastar_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ device_t(mconfig, C64_VIZASTAR, "VizaStar 64 XL4", tag, owner, clock, "c64_vizastar", __FILE__),
+ device_c64_expansion_card_interface(mconfig, *this)
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void c64_vizastar_cartridge_device::device_start()
+{
+}
+
+
+//-------------------------------------------------
+// c64_cd_r - cartridge data read
+//-------------------------------------------------
+
+UINT8 c64_vizastar_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)
+ {
+ data = UNSCRAMBLE_DATA(m_roml[UNSCRAMBLE_ADDRESS(offset & 0xfff)]);
+ }
+
+ return data;
+}