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92fbd44509
Currently only supports one Mockingboard in slot 4, but it should be fairly trivial to add another in slot 5. Tested with Ultima 3, 4 & 5, and Mockingboard disk #1. Also, added some fixes to correct the timing of the 6502 and sound; I believe I have a good understanding of it now, even though there's still work to do to keep the main CPU thread from starving the audio thread (which still happens, but less often now).
60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
//
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// Virtual 65C02 Header file
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//
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// by James Hammons
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// (c) 2005 Underground Software
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//
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#ifndef __V65C02_H__
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#define __V65C02_H__
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#include <stdint.h>
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// Useful defines
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#define FLAG_N 0x80 // Negative
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#define FLAG_V 0x40 // oVerflow
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#define FLAG_UNK 0x20 // ??? (always set when read?)
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#define FLAG_B 0x10 // Break
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#define FLAG_D 0x08 // Decimal
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#define FLAG_I 0x04 // Interrupt
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#define FLAG_Z 0x02 // Zero
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#define FLAG_C 0x01 // Carry
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#define V65C02_ASSERT_LINE_RESET 0x0001 // v65C02 RESET line
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#define V65C02_ASSERT_LINE_IRQ 0x0002 // v65C02 IRQ line
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#define V65C02_ASSERT_LINE_NMI 0x0004 // v65C02 NMI line
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#define V65C02_STATE_ILLEGAL_INST 0x0008 // Illegal instruction executed flag
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//#define V65C02_START_DEBUG_LOG 0x0020 // Debug log go (temporary!)
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// Useful structs
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struct V65C02REGS
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{
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uint16_t pc; // 65C02 PC register
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uint8_t cc; // 65C02 Condition Code register
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uint8_t sp; // 65C02 System stack pointer (bound to $01xx)
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uint8_t a; // 65C02 A register
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uint8_t x; // 65C02 X index register
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uint8_t y; // 65C02 Y register
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uint64_t clock; // 65C02 clock (@ 1 MHz, wraps at 570,842 years)
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uint8_t (* RdMem)(uint16_t); // Address of BYTE read routine
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void (* WrMem)(uint16_t, uint8_t); // Address of BYTE write routine
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void (* Timer)(uint16_t); // Address of Timer routine
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uint16_t cpuFlags; // v65C02 IRQ/RESET flags
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uint64_t overflow; // # of cycles we went over last time through
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};
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// Global variables (exported)
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extern bool dumpDis;
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// Function prototypes
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void Execute65C02(V65C02REGS *, uint32_t); // Function to execute 65C02 instructions
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uint64_t GetCurrentV65C02Clock(void); // Get the clock of the currently executing CPU
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void AssertLine(uint16_t); // Assert 65C02 line in current context
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#endif // __V65C02_H__
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