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Implement NEC V20/V30's i8080 emulation mode

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Cacodemon345
2024-03-30 16:21:41 +06:00
parent 4e4ad8913c
commit 99e8d13afa
6 changed files with 1025 additions and 365 deletions
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69
src/include/86box/i8080.h
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@@ -1,69 +0,0 @@
/*
* 86Box A hypervisor and IBM PC system emulator that specializes in
* running old operating systems and software designed for IBM
* PC systems and compatibles from 1981 through fairly recent
* system designs based on the PCI bus.
*
* This file is part of the 86Box distribution.
*
* 8080 CPU emulation (header).
*
*
*
* Authors: Cacodemon345
*
* Copyright 2022 Cacodemon345
*/
#include <stdint.h>
typedef struct i8080 {
union {
uint16_t af; /* Intended in case we also go for μPD9002 emulation, which also has a Z80 emulation mode. */
struct {
uint8_t a;
uint8_t flags;
};
};
union {
uint16_t bc;
struct {
uint8_t b;
uint8_t c;
};
};
union {
uint16_t de;
struct {
uint8_t d;
uint8_t e;
};
};
union {
uint16_t hl;
struct {
uint8_t h;
uint8_t l;
};
};
uint16_t pc;
uint16_t sp;
uint16_t oldpc;
uint16_t ei;
uint32_t pmembase;
uint32_t dmembase; /* Base from where i8080 starts. */
uint8_t emulated; /* 0 = not emulated, use separate registers, 1 = emulated, use x86 registers. */
uint16_t *cpu_flags;
void (*writemembyte)(uint32_t, uint8_t);
uint8_t (*readmembyte)(uint32_t);
void (*startclock)(void);
void (*endclock)(void);
void (*checkinterrupts)(void);
uint8_t (*fetchinstruction)(void *);
} i8080;
#define C_FLAG_I8080 (1 << 0)
#define P_FLAG_I8080 (1 << 2)
#define AC_FLAG_I8080 (1 << 4)
#define Z_FLAG_I8080 (1 << 6)
#define S_FLAG_I8080 (1 << 7)