2 // Virtual 6809 Header file
6 // (c) 1997, 2004 Underground Software
16 #define FLAG_E 0x80 // Entire
17 #define FLAG_F 0x40 // Fast IRQ
18 #define FLAG_H 0x20 // Half carry
19 #define FLAG_I 0x10 // IRQ
20 #define FLAG_N 0x08 // Negative
21 #define FLAG_Z 0x04 // Zero
22 #define FLAG_V 0x02 // oVerflow
23 #define FLAG_C 0x01 // Carry
25 #define V6809_ASSERT_LINE_RESET 0x0001 // v6809 RESET line
26 #define V6809_ASSERT_LINE_IRQ 0x0002 // v6809 IRQ line
27 #define V6809_ASSERT_LINE_FIRQ 0x0004 // v6809 FIRQ line
28 #define V6809_ASSERT_LINE_NMI 0x0008 // v6809 NMI line
29 #define V6809_STATE_SYNC 0x0010 // v6809 SYNC line
30 #define V6809_STATE_ILLEGAL_INST 0x0020 // Illegal instruction executed flag
32 //#define V6809_START_DEBUG_LOG EQU 0020h // Debug log go (temporary!)
38 uint16 pc; // 6809 PC register
39 uint16 x; // 6809 X index register
40 uint16 y; // 6809 Y index register
41 uint16 s; // 6809 System stack pointer
42 uint16 u; // 6809 User stack pointer
43 uint8 cc; // 6809 Condition Code register
44 uint8 a; // 6809 A register
45 uint8 b; // 6809 B register
46 uint8 dp; // 6809 Direct Page register
47 uint32 clock; // 6809 clock
48 //uint32 _reserved;// uint8 (* Fetch)(uint16&); // Address of uint8 fetch routine
49 uint8 (* RdMem)(uint16); // Address of uint8 read routine
50 void (* WrMem)(uint16, uint8); // Address of uint8 write routine
51 uint32 cpuFlags; // v6809 IRQ/RESET flags
54 // Function prototypes
56 void Execute6809(V6809REGS *, uint32); // Function to execute 6809 instructions
57 uint32 GetCurrentV6809Clock(void); // Get the clock of the currently executing CPU