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-rw-r--r--src/devices/cpu/rw5000/a5000.cpp86
1 files changed, 86 insertions, 0 deletions
diff --git a/src/devices/cpu/rw5000/a5000.cpp b/src/devices/cpu/rw5000/a5000.cpp
new file mode 100644
index 00000000000..bb39455cc18
--- /dev/null
+++ b/src/devices/cpu/rw5000/a5000.cpp
@@ -0,0 +1,86 @@
+// license:BSD-3-Clause
+// copyright-holders:hap
+/*
+
+ Rockwell A5000 MCU
+
+*/
+
+#include "emu.h"
+#include "a5000.h"
+
+#include "rw5000d.h"
+
+
+DEFINE_DEVICE_TYPE(A5000, a5000_cpu_device, "a5000", "Rockwell A5000")
+
+
+// constructor
+a5000_cpu_device::a5000_cpu_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock, int prgwidth, address_map_constructor program, int datawidth, address_map_constructor data) :
+ b5000_cpu_device(mconfig, type, tag, owner, clock, prgwidth, program, datawidth, data)
+{ }
+
+a5000_cpu_device::a5000_cpu_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) :
+ a5000_cpu_device(mconfig, A5000, tag, owner, clock, 9, address_map_constructor(FUNC(a5000_cpu_device::program_448x8), this), 6, address_map_constructor(FUNC(a5000_cpu_device::data_45x4), this))
+{ }
+
+
+// disasm
+std::unique_ptr<util::disasm_interface> a5000_cpu_device::create_disassembler()
+{
+ return std::make_unique<a5000_disassembler>();
+}
+
+
+//-------------------------------------------------
+// execute
+//-------------------------------------------------
+
+void a5000_cpu_device::execute_one()
+{
+ switch (m_op)
+ {
+ case 0x02: op_illegal(); break;
+ case 0x03: op_tkb(); break;
+ case 0x76: m_mtd_step = 1; break;
+ case 0x77: op_atb(); break;
+
+ // rest is same as B5000
+ default: b5000_cpu_device::execute_one(); break;
+ }
+}
+
+
+//-------------------------------------------------
+// changed opcodes (no need for separate file)
+//-------------------------------------------------
+
+void a5000_cpu_device::op_mtd_step()
+{
+ assert(m_mtd_step > 0);
+
+ // MTD: load strobe + segments (multi step)
+ switch (m_mtd_step)
+ {
+ // step 1: disable strobe and segment drivers
+ case 1:
+ m_write_str(0);
+ op_kseg();
+ break;
+
+ // step 2: load strobe from Bl
+ case 2:
+ m_write_str(1 << m_prev_bl);
+ break;
+
+ // step 4: load segment drivers
+ case 4:
+ seg_w(m_seg | decode_digit(m_prev3_c << 4 | ram_r()));
+ m_mtd_step = 0;
+ return;
+
+ default:
+ break;
+ }
+ m_mtd_step++;
+}