source/src/vm/pasopia7/rampac2.cpp

   1 /*
   2         TOSHIBA PASOPIA Emulator 'EmuPIA'
   3         TOSHIBA PASOPIA 7 Emulator 'EmuPIA7'
   4
   5         Author : Takeda.Toshiya
   6         Date   : 2006.09.20 -
   7
   8         [ ram pac 2 (32kbytes) ]
   9 */
  10
  11 #include "rampac2.h"
  12 #include "../../fileio.h"
  13
  14 static const uint8 header[16] = {
  15         0xaa, 0x1f, 0x04, 0x00, 0x04, 0x80, 0x00, 0x01, 0x04, 0x04, 0x01, 0x03, 0x08, 0x00, 0x00, 0x00
  16 };
  17
  18 void RAMPAC2::initialize(int id)
  19 {
  20         opened = modified = false;
  21
  22         // note: rampac2 id must be 1 or 2 !!!
  23         if(_tcscmp(config.recent_binary_path[id - 1][0], _T("")) != 0) {
  24                 // open last file
  25                 open_file(config.recent_binary_path[id - 1][0]);
  26         } else {
  27                 // open default rampac2 file
  28                 _TCHAR file_path[_MAX_PATH];
  29                 _stprintf_s(file_path, _MAX_PATH, _T("%sRAMPAC%d.BIN"), emu->application_path(), id);
  30                 open_file(file_path);
  31         }
  32 }
  33
  34 void RAMPAC2::release()
  35 {
  36         // save modified data
  37         if(opened && modified) {
  38                 FILEIO* fio = new FILEIO();
  39                 if(fio->Fopen(path, FILEIO_WRITE_BINARY)) {
  40                         fio->Fwrite(ram, sizeof(ram), 1);
  41                         fio->Fclose();
  42                 }
  43                 delete fio;
  44         }
  45 }
  46
  47 void RAMPAC2::reset()
  48 {
  49         ptr = 0;
  50 }
  51
  52 void RAMPAC2::write_io8(uint32 addr, uint32 data)
  53 {
  54         switch(addr & 0xff) {
  55         case 0x18:
  56                 ptr = (ptr & 0x7f00) | data;
  57                 break;
  58         case 0x19:
  59                 ptr = (ptr & 0x00ff) | ((data & 0x7f) << 8);
  60                 break;
  61         case 0x1a:
  62                 if(ram[ptr & 0x7fff] != data) {
  63                         modified = true;
  64                 }
  65                 ram[ptr & 0x7fff] = data;
  66                 break;
  67         }
  68 }
  69
  70 uint32 RAMPAC2::read_io8(uint32 addr)
  71 {
  72         return ram[ptr & 0x7fff];
  73 }
  74
  75 void RAMPAC2::open_file(_TCHAR* file_path)
  76 {
  77         // save modified data
  78         release();
  79
  80         // load specified file
  81         FILEIO* fio = new FILEIO();
  82         if(fio->Fopen(file_path, FILEIO_READ_BINARY)) {
  83                 fio->Fread(ram, sizeof(ram), 1);
  84                 fio->Fclose();
  85         } else {
  86                 // initialize formatted image
  87                 memset(ram, 0, sizeof(ram));
  88                 memcpy(ram, header, sizeof(header));
  89                 memset(ram + 0x20, 0xff, 0x200);
  90                 memset(ram + 0x300, 0xfe, 0x004);
  91                 memset(ram + 0x304, 0xff, 0x0fc);
  92         }
  93         delete fio;
  94
  95         _tcscpy_s(path, _MAX_PATH, file_path);
  96         opened = true;
  97         modified = false;
  98 }
  99
 100 #define STATE_VERSION   1
 101
 102 void RAMPAC2::save_state(FILEIO* state_fio)
 103 {
 104         state_fio->FputUint32(STATE_VERSION);
 105
 106         state_fio->Fwrite(ram, sizeof(ram), 1);
 107         state_fio->FputUint32(ptr);
 108         state_fio->FputBool(opened);
 109         state_fio->FputBool(modified);
 110 }
 111
 112 bool RAMPAC2::load_state(FILEIO* state_fio)
 113 {
 114         if(state_fio->FgetUint32() != STATE_VERSION) {
 115                 return false;
 116         }
 117         state_fio->Fread(ram, sizeof(ram), 1);
 118         ptr = state_fio->FgetUint32();
 119         opened = state_fio->FgetBool();
 120         modified = state_fio->FgetBool();
 121         return true;
 122 }
 123