Shamusworld >> Repos - stargem2/blob - src/v6808.h

   1 //
   2 // Virtual 6808 Header file
   3 //
   4 // by James L. Hammons
   5 //
   6 // (c) 2004 Underground Software
   7 //
   8
   9 #ifndef __V6808_H__
  10 #define __V6808_H__
  11
  12 #include "types.h"
  13
  14 // Useful defines
  15
  16 #define FLAG_E          0x80            // ??? Entire ???
  17 #define FLAG_F          0x40            // ??? Fast IRQ ???
  18
  19 #define FLAG_H          0x20            // Half carry
  20 #define FLAG_I          0x10            // IRQ
  21 #define FLAG_N          0x08            // Negative
  22 #define FLAG_Z          0x04            // Zero
  23 #define FLAG_V          0x02            // oVerflow
  24 #define FLAG_C          0x01            // Carry
  25
  26 #define V6808_ASSERT_LINE_RESET         0x0001          // v6808 RESET line
  27 #define V6808_ASSERT_LINE_IRQ           0x0002          // v6808 IRQ line
  28 #define V6808_ASSERT_LINE_NMI           0x0004          // v6808 NMI line
  29 #define V6808_STATE_SYNC                        0x0008          // ??? v6808 SYNC line ???
  30 #define V6808_STATE_ILLEGAL_INST        0x0010          // Illegal instruction executed flag
  31 //#define V6809_START_DEBUG_LOG         0x0020          // Debug log go (temporary!)
  32
  33 // Useful structs
  34
  35 struct V6808REGS
  36 {
  37         uint16 pc;                                              // 6808 PC register
  38         uint16 x;                                               // 6808 X index register
  39         uint16 s;                                               // 6808 System stack pointer
  40         uint8 cc;                                               // 6808 Condition Code register
  41         uint8 a;                                                // 6808 A register
  42         uint8 b;                                                // 6808 B register
  43         uint32 clock;                                   // 6808 clock
  44 //uint32 _reserved;//   uint8 (* Fetch)(uint16&);               // Address of uint8 fetch routine
  45         uint8 (* RdMem)(uint16);                // Address of uint8 read routine
  46         void (* WrMem)(uint16, uint8);  // Address of uint8 write routine
  47         uint32 cpuFlags;                                // v6808 IRQ/RESET flags
  48 };
  49
  50 // Function prototypes
  51
  52 void Execute6808(V6808REGS *, uint32);    // Function to execute 6808 instructions
  53 uint32 GetCurrentV6808Clock(void);              // Get the clock of the currently executing CPU
  54
  55 #endif  // __V6808_H__