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https://github.com/holub/mame
synced 2025-04-21 07:52:35 +03:00
Started implementing the actual emulation of the Patinho Feio instruction set.
(previous commits provided only disasm routines)
This commit is contained in:
Felipe Corrêa da Silva Sanches
parent
51b8dfa01b
commit
9037168f33
@ -8,17 +8,24 @@
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#include "debugger.h"
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#include "patinho_feio.h"
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#define CI m_ci //The program counter is called "contador de instrucoes" in portuguese
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#define PC m_pc //The program counter is called "contador de instrucoes" in portuguese
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#define ACC m_acc
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#define READ_BYTE_PATINHO(A) ((signed)m_program->read_byte(A))
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#define WRITE_BYTE_PATINHO(A,V) (m_program->write_byte(A,V))
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#define READ_INDEX_REG() READ_BYTE_PATINHO(0x000)
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#define WRITE_INDEX_REG(V) WRITE_BYTE_PATINHO(0x000, V)
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#define ADDRESS_MASK_4K 0xFFF
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#define INCREMENT_CI_4K (CI = (CI+1) & ADDRESS_MASK_4K)
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#define INCREMENT_PC_4K (PC = (PC+1) & ADDRESS_MASK_4K)
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const device_type PATINHO_FEIO = &device_creator<patinho_feio_cpu_device>;
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//Internal 4kbytes of RAM
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static ADDRESS_MAP_START(prog_8bit, AS_PROGRAM, 8, patinho_feio_cpu_device)
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AM_RANGE(0x0000, 0x0fff) AM_RAM
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AM_RANGE(0x0000, 0x0fff) AM_RAM AM_SHARE("internalram")
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ADDRESS_MAP_END
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patinho_feio_cpu_device::patinho_feio_cpu_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
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@ -30,25 +37,25 @@ patinho_feio_cpu_device::patinho_feio_cpu_device(const machine_config &mconfig,
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void patinho_feio_cpu_device::device_start()
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{
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m_ci = 0;
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m_acc = 0;
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m_program = &space(AS_PROGRAM);
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save_item(NAME(m_ci));
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save_item(NAME(m_pc));
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save_item(NAME(m_acc));
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// Register state for debugger
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state_add( PATINHO_FEIO_CI, "CI", m_ci ).mask(0xFFF);
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state_add( PATINHO_FEIO_ACC, "ACC", m_acc ).mask(0xFF);
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state_add( PATINHO_FEIO_CI, "CI", m_pc ).mask(0xFFF);
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state_add( PATINHO_FEIO_ACC, "ACC", m_acc ).mask(0xFF);
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state_add(STATE_GENPC, "GENPC", m_pc).formatstr("0%06O").noshow();
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m_icountptr = &m_icount;
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m_run = true;
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}
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void patinho_feio_cpu_device::device_reset()
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{
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m_pc = 0xE00;
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m_acc = 0;
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m_run = true;
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}
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/* execute instructions on this CPU until icount expires */
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@ -59,8 +66,6 @@ void patinho_feio_cpu_device::execute_run()
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if ((! m_run)){
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m_icount = 0; /* if processor is stopped, just burn cycles */
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} else {
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debugger_instruction_hook(this, CI);
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execute_instruction();
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m_icount --;
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}
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@ -68,12 +73,64 @@ void patinho_feio_cpu_device::execute_run()
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while (m_icount > 0);
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}
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/* execute one instruction */
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void patinho_feio_cpu_device::execute_instruction()
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{
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// char opcode = patinho_feio_read(CI);
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INCREMENT_CI_4K;
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debugger_instruction_hook(this, PC);
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offs_t addr;
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unsigned char tmp;
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unsigned char opcode = READ_BYTE_PATINHO(PC);
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INCREMENT_PC_4K;
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switch (opcode){
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case 0xDA:
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//CARI="Carrega Imediato":
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// Load an immediate into the accumulator
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ACC = READ_BYTE_PATINHO(PC);
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INCREMENT_PC_4K;
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return;
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case 0x9A:
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//INIB="Inibe"
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// disables interrupts
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m_interrupts_enabled = false;
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return;
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case 0x9B:
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//PERM="Permite"
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// enables interrupts
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m_interrupts_enabled = true;
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return;
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case 0x9C:
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//ESP="Espera":
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// Holds execution and waits for an interrupt to occur.
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m_run = false;
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m_wait_for_interrupt = true;
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return;
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case 0x9D:
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//PARE="Pare":
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// Holds execution. This can only be recovered by
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// manually triggering execution again by
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// pressing the "Partida" (start) button in the panel
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m_run = false;
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m_wait_for_interrupt = false;
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return;
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case 0x9E:
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//TRI="Troca com Indexador":
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// Exchange the value of the accumulator with the index register
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tmp = ACC;
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ACC = READ_INDEX_REG();
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WRITE_INDEX_REG(tmp);
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return;
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}
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switch (opcode & 0xF0){
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case 0x00:
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//PLA = "Pula": Jump to address
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addr = READ_BYTE_PATINHO(PC) & 0xFFF;
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INCREMENT_PC_4K;
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PC = addr;
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return;
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}
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printf("unimplemented opcode: 0x%02X\n", opcode);
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}
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offs_t patinho_feio_cpu_device::disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options)
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@ -25,11 +25,13 @@ protected:
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/* processor registers */
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int m_acc; /* accumulator (8 bits) */
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int m_ci; /* program counter (12 bits)
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int m_pc; /* program counter (12 bits)
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(CI stands for "Contador de Instrucao") */
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/* processor state flip-flops */
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bool m_run; /* processor is running */
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bool m_wait_for_interrupt;
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bool m_interrupts_enabled;
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int m_address_mask; /* address mask */
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int m_icount;
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@ -16,7 +16,7 @@ public:
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{ }
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DECLARE_DRIVER_INIT(patinho_feio);
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// virtual void machine_start();
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virtual void machine_start();
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// virtual void machine_reset();
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// required_device<patinho_feio_cpu_device> m_maincpu;
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};
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@ -28,35 +28,36 @@ DRIVER_INIT_MEMBER(patinho_feio_state, patinho_feio)
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{
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}
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void patinho_feio_state::machine_start(){
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//copy the "absolute program example" from appendix G directly into RAM
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// This is a hack for setting up the computer
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// while we don't support loading programs from punched tape rolls...
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UINT8 *RAM = (UINT8 *) memshare("maincpu:internalram")->ptr();
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UINT8 *program = memregion("example_program")->base();
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memcpy(&RAM[0xE00], program, 0x0D5);
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}
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static INPUT_PORTS_START( patinho_feio )
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// PORT_START("PANEL") /* various operator control panel switches */
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// PORT_BIT(?, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("control panel key") PORT_CODE(KEYCODE_?)
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// PORT_BIT(?, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("control panel key") PORT_CODE(KEYCODE_?)
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// PORT_BIT(?, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("control panel key") PORT_CODE(KEYCODE_?)
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// PORT_BIT(?, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("control panel key") PORT_CODE(KEYCODE_?)
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// PORT_BIT(?, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("control panel key") PORT_CODE(KEYCODE_?)
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// PORT_BIT(?, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("control panel key") PORT_CODE(KEYCODE_?)
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// PORT_BIT(?, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("control panel key") PORT_CODE(KEYCODE_?)
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// PORT_BIT(?, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("control panel key") PORT_CODE(KEYCODE_?)
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// PORT_START("PANEL") /* various operator control panel switches */
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// PORT_BIT(?, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("control panel key") PORT_CODE(KEYCODE_?)
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// PORT_BIT(?, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("control panel key") PORT_CODE(KEYCODE_?)
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// PORT_BIT(?, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("control panel key") PORT_CODE(KEYCODE_?)
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// PORT_BIT(?, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("control panel key") PORT_CODE(KEYCODE_?)
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// PORT_BIT(?, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("control panel key") PORT_CODE(KEYCODE_?)
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// PORT_BIT(?, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("control panel key") PORT_CODE(KEYCODE_?)
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// PORT_BIT(?, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("control panel key") PORT_CODE(KEYCODE_?)
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// PORT_BIT(?, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("control panel key") PORT_CODE(KEYCODE_?)
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INPUT_PORTS_END
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//Internal 4kbytes of RAM
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static ADDRESS_MAP_START(patinho_program_map, AS_PROGRAM, 8, patinho_feio_state)
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AM_RANGE(0x0000, 0x0fff) AM_ROM
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ADDRESS_MAP_END
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static MACHINE_CONFIG_START( patinho_feio, patinho_feio_state )
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/* basic machine hardware */
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/* CPU @ approx. 500 kHz (memory cycle time is 2usec) */
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MCFG_CPU_ADD("maincpu", PATINHO_FEIO, 500000)
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MCFG_CPU_PROGRAM_MAP(patinho_program_map)
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/* basic machine hardware */
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/* CPU @ approx. 500 kHz (memory cycle time is 2usec) */
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MCFG_CPU_ADD("maincpu", PATINHO_FEIO, 500000)
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MACHINE_CONFIG_END
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ROM_START(patinho)
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/*CPU memory space*/
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ROM_REGION(0x01000,"maincpu", ROMREGION_ERASEFF)
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/* Load this into th internal RAM... */
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ROM_LOAD("apendice_g__hexam.bin", 0x000, 0x0d5, CRC(c6addc59) SHA1(126bc97247eac45c58708eaac216c2438e9e4af9) )
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ROM_START( patinho )
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ROM_REGION( 0x0d5, "example_program", 0 )
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ROM_LOAD( "apendice_g__hexam.bin", 0x000, 0x0d5, CRC(c6addc59) SHA1(126bc97247eac45c58708eaac216c2438e9e4af9) )
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ROM_END
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/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME */
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