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97a46a7b9b
My idea of plugging a RC2014 bridge directly onto a Sega Master System cartridge doesn't work. The SMS eats all I/O addr space, we can't use it. Therefore, this naive idea, in the emulator, of reusing sdc.c in sms.c as-is, doesn't work either. I'll have to find another way of communicating to a SPI device on the SMS. I'll probably do it through a controller port. Meanwhile, I need to decouple SPI from SDC in the emulator code so that I can reuse sdc.c. This is what is done here.
44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
#pragma once
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#include <stdint.h>
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#include <stdbool.h>
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#include "z80.h"
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typedef byte (*IORD) ();
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typedef void (*IOWR) (byte data);
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typedef byte (*EXCH) (byte data);
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typedef struct {
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Z80Context cpu;
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byte mem[0x10000];
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// Set to non-zero to specify where ROM ends. Any memory write attempt
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// below ramstart will trigger a warning.
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ushort ramstart;
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// The minimum value reached by SP at any point during execution.
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ushort minsp;
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// same principle for IX
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ushort maxix;
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// Array of 0x100 function pointers to IO read and write routines. Leave to
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// NULL when IO port is unhandled.
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IORD iord[0x100];
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IOWR iowr[0x100];
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} Machine;
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typedef enum {
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TRI_HIGH,
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TRI_LOW,
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TRI_HIGHZ
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} Tristate;
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Machine* emul_init();
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void emul_deinit();
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bool emul_step();
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bool emul_steps(unsigned int steps);
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void emul_loop();
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void emul_trace(ushort addr);
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void emul_memdump();
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void emul_debugstr(char *s);
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void emul_printdebug();
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// use when a port is a NOOP, but it's not an error to access it.
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byte iord_noop();
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void iowr_noop(byte val);
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