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Diffstat (limited to 'src/devices/bus/odyssey2/ktaa.cpp')
-rw-r--r--src/devices/bus/odyssey2/ktaa.cpp52
1 files changed, 52 insertions, 0 deletions
diff --git a/src/devices/bus/odyssey2/ktaa.cpp b/src/devices/bus/odyssey2/ktaa.cpp
new file mode 100644
index 00000000000..e898f1c1282
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+++ b/src/devices/bus/odyssey2/ktaa.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Wilbert Pol, Fabio Priuli, hap
+/******************************************************************************
+
+Homebrew KTAA(Kill the Attacking Aliens) cartridge emulation
+
+Bankswitched ROM with page size of 3KB.
+
+******************************************************************************/
+
+#include "emu.h"
+#include "ktaa.h"
+
+DEFINE_DEVICE_TYPE(O2_ROM_KTAA, o2_ktaa_device, "o2_ktaa", "Odyssey 2 Homebrew KTAA")
+
+
+//-------------------------------------------------
+// o2_ktaa_device - constructor
+//-------------------------------------------------
+
+o2_ktaa_device::o2_ktaa_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
+ device_t(mconfig, O2_ROM_KTAA, tag, owner, clock),
+ device_o2_cart_interface(mconfig, *this)
+{ }
+
+void o2_ktaa_device::device_start()
+{
+ save_item(NAME(m_bank));
+}
+
+void o2_ktaa_device::cart_init()
+{
+ if (m_rom_size != 0xc00 && m_rom_size != 0xc00*2 && m_rom_size != 0xc00*4)
+ fatalerror("o2_ktaa_device: ROM size must be multiple of 3KB\n");
+
+ m_bank_mask = (m_rom_size / 0xc00) - 1;
+}
+
+
+//-------------------------------------------------
+// mapper specific handlers
+//-------------------------------------------------
+
+u8 o2_ktaa_device::read_rom04(offs_t offset)
+{
+ return m_rom[offset + m_bank * 0xc00];
+}
+
+u8 o2_ktaa_device::read_rom0c(offs_t offset)
+{
+ return m_rom[offset + 0x800 + m_bank * 0xc00];
+}