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// license:BSD-3-Clause
// copyright-holders:Michael Zapf
/*
Texas Instruments TI990/10 CPU board
The first member of the family was actually the ti990/10 minicomputer,
released in 1975. tms9900 was released in 1976, and has the same
instruction set as ti990/10: however, tms9900 is slower, it does not
support privileges and memory mapping, and illegal instructions do not
cause an error interrupt.
The ti990 family later evoluted into the huge ti990/12 system, with support
for 144 different instructions, and microcode programming in case some user
found it was not enough. ti990/10 was eventually replaced by a cheaper
ti990/10a board, built around a tms99000 microprocessor.
tms99000 is the successor to both ti9900 and ti990/10. It supports
privileges, and has a coprocessor interface which enables the use of an
external memory mapper. Additionally, it can use a Macrostore ROM to
emulate additional instructions.
**** This is WORK IN PROGRESS ****
*/
#include "emu.h"
#include "ti990_10.h"
#include "9900dasm.h"
/*
The following defines can be set to 0 or 1 to disable or enable certain
output in the log.
*/
// Emulation setup
#define TRACE_SETUP 0
// Emulation details
#define TRACE_EMU 0
/****************************************************************************
Constructor for TI 990/10
The CRU mask is related to the bits, not to their addresses which are
twice their number. Accordingly, the TMS9900 has a CRU bitmask 0x0fff.
****************************************************************************/
ti990_10_device::ti990_10_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: cpu_device(mconfig, TI990_10, tag, owner, clock),
m_program_config("program", ENDIANNESS_BIG, 16, 21),
m_io_config("cru", ENDIANNESS_BIG, 8, 12),
m_prgspace(nullptr),
m_cru(nullptr)
{
}
ti990_10_device::~ti990_10_device()
{
}
void ti990_10_device::device_start()
{
m_prgspace = &space(AS_PROGRAM);
m_cru = &space(AS_IO);
// set our instruction counter
set_icountptr(m_icount);
state_add(STATE_GENPC, "GENPC", PC).formatstr("%4s").noshow();
state_add(STATE_GENPCBASE, "CURPC", PC).formatstr("%4s").noshow();
state_add(STATE_GENFLAGS, "status", m_state_any).callimport().callexport().formatstr("%16s").noshow();
}
void ti990_10_device::device_stop()
{
if (TRACE_SETUP) logerror("ti990_10: Deleting lookup tables\n");
}
/*
TI990_10 hard reset
The device reset is just the emulator's trigger for the reset procedure
which is invoked via the main loop.
*/
void ti990_10_device::device_reset()
{
if (TRACE_EMU) logerror("ti990_10: Device reset by emulator\n");
}
device_memory_interface::space_config_vector ti990_10_device::memory_space_config() const
{
return space_config_vector {
std::make_pair(AS_PROGRAM, &m_program_config),
std::make_pair(AS_IO, &m_io_config)
};
}
void ti990_10_device::execute_run()
{
do
{
// TODO: Complete the implementation
m_icount--;
} while (m_icount>0);
}
void ti990_10_device::execute_set_input(int irqline, int state)
{
}
// ==========================================================================
uint32_t ti990_10_device::execute_min_cycles() const noexcept
{
return 2;
}
// TODO: Compute this value, just a wild guess for the average
uint32_t ti990_10_device::execute_max_cycles() const noexcept
{
return 10;
}
// TODO: check 9900dasm
std::unique_ptr<util::disasm_interface> ti990_10_device::create_disassembler()
{
return std::make_unique<tms9900_disassembler>(TMS9900_ID);
}
DEFINE_DEVICE_TYPE(TI990_10, ti990_10_device, "ti990_10_cpu", "Texas Instruments TI990/10 CPU")
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