summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/cpu/apexc/apexc.h
blob: 92cc60d7f09ab6a49a2c171b992418eaa164f1d4 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
// license:BSD-3-Clause
// copyright-holders:Raphael Nabet
/* register names for apexc_get_reg & apexc_set_reg */
#ifndef MAME_CPU_APEXC_APEXC_H
#define MAME_CPU_APEXC_APEXC_H

#pragma once

enum
{
	APEXC_CR =1,    /* control register */
	APEXC_A,        /* accumulator */
	APEXC_R,        /* register */
	APEXC_ML,       /* memory location */
	APEXC_WS,       /* working store */
	APEXC_STATE,    /* whether CPU is running */
};

class apexc_cpu_device : public cpu_device
{
public:
	// construction/destruction
	apexc_cpu_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);

protected:
	// device-level overrides
	virtual void device_start() override;
	virtual void device_reset() override;

	// device_execute_interface overrides
	virtual uint32_t execute_min_cycles() const override { return 2; }
	virtual uint32_t execute_max_cycles() const override { return 75; }
	virtual uint32_t execute_input_lines() const override { return 0; }
	virtual void execute_run() override;

	// device_memory_interface overrides
	virtual space_config_vector memory_space_config() const override;

	// device_state_interface overrides
	virtual void state_import(const device_state_entry &entry) override;

	// device_disasm_interface overrides
	virtual util::disasm_interface *create_disassembler() override;

	inline uint32_t apexc_readmem(uint32_t address) { return m_program->read_dword((address)<<2); }
	inline void apexc_writemem(uint32_t address, uint32_t data) { m_program->write_dword((address)<<2, (data)); }
	inline void apexc_writemem_masked(uint32_t address, uint32_t data, uint32_t mask) { apexc_writemem((address), (apexc_readmem(address) & ~(mask)) | ((data) & (mask))); }

	uint32_t effective_address(uint32_t address);
	uint32_t word_read(uint32_t address, uint32_t special);
	void word_write(uint32_t address, uint32_t data, uint32_t mask);
	uint8_t papertape_read();
	void papertape_punch(uint8_t data);

	uint32_t load_ml(uint32_t address, uint32_t vector);
	void execute();

	address_space_config m_program_config;
	address_space_config m_io_config;

	uint32_t m_a;   /* accumulator */
	uint32_t m_r;   /* register */
	uint32_t m_cr;  /* control register (i.e. instruction register) */
	int m_ml;     /* memory location (current track in working store, and requested word position within track) (10 bits) */
	int m_working_store;  /* current working store (group of 16 tracks) (1-15) */
	int m_current_word;   /* current word position within track (0-31) */

	int m_running;    /* 1 flag: */
						/* running: flag implied by the existence of the stop instruction */
	uint32_t m_pc;  /* address of next instruction for the disassembler */

	address_space *m_program;
	address_space *m_io;
	int m_icount;

	// For state
	uint32_t m_ml_full;
	uint32_t m_genpc;
};


DECLARE_DEVICE_TYPE(APEXC, apexc_cpu_device)

#endif // MAME_CPU_APEXC_APEXC_H