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-rw-r--r--src/devices/bus/adam/ram.cpp72
1 files changed, 72 insertions, 0 deletions
diff --git a/src/devices/bus/adam/ram.cpp b/src/devices/bus/adam/ram.cpp
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+++ b/src/devices/bus/adam/ram.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Curt Coder
+/**********************************************************************
+
+ Coleco Adam Internal 64KB RAM Expansion emulation
+
+**********************************************************************/
+
+#include "ram.h"
+
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type ADAM_RAM = &device_creator<adam_ram_expansion_device>;
+
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// adam_ram_expansion_device - constructor
+//-------------------------------------------------
+
+adam_ram_expansion_device::adam_ram_expansion_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ device_t(mconfig, ADAM_RAM, "Adam 64KB RAM expansion", tag, owner, clock, "adam_ram", __FILE__),
+ device_adam_expansion_slot_card_interface(mconfig, *this),
+ m_ram(*this, "ram")
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void adam_ram_expansion_device::device_start()
+{
+ m_ram.allocate(0x10000);
+}
+
+
+//-------------------------------------------------
+// adam_bd_r - buffered data read
+//-------------------------------------------------
+
+UINT8 adam_ram_expansion_device::adam_bd_r(address_space &space, offs_t offset, UINT8 data, int bmreq, int biorq, int aux_rom_cs, int cas1, int cas2)
+{
+ if (!cas2)
+ {
+ data = m_ram[offset];
+ }
+
+ return data;
+}
+
+
+//-------------------------------------------------
+// adam_bd_w - buffered data write
+//-------------------------------------------------
+
+void adam_ram_expansion_device::adam_bd_w(address_space &space, offs_t offset, UINT8 data, int bmreq, int biorq, int aux_rom_cs, int cas1, int cas2)
+{
+ if (!cas2)
+ {
+ m_ram[offset] = data;
+ }
+}