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
  13 namespace PASOPIA7 {
  14
  15 static const uint8_t header[16] = {
  16         0xaa, 0x1f, 0x04, 0x00, 0x04, 0x80, 0x00, 0x01, 0x04, 0x04, 0x01, 0x03, 0x08, 0x00, 0x00, 0x00
  17 };
  18
  19 void RAMPAC2::initialize(int id)
  20 {
  21         opened = modified = false;
  22
  23         // note: rampac2 id must be 1 or 2 !!!
  24         if(_tcscmp(config.recent_binary_path[id - 1][0], _T("")) != 0) {
  25                 // open last file
  26                 open_file(config.recent_binary_path[id - 1][0]);
  27         } else {
  28                 // open default rampac2 file
  29                 open_file(create_local_path(_T("RAMPAC%d.BIN"), id));
  30         }
  31 }
  32
  33 void RAMPAC2::release()
  34 {
  35         // save modified data
  36         if(opened && modified) {
  37                 FILEIO* fio = new FILEIO();
  38                 if(fio->Fopen(path, FILEIO_WRITE_BINARY)) {
  39                         fio->Fwrite(ram, sizeof(ram), 1);
  40                         fio->Fclose();
  41                 }
  42                 delete fio;
  43         }
  44 }
  45
  46 void RAMPAC2::reset()
  47 {
  48         ptr = 0;
  49 }
  50
  51 void RAMPAC2::write_io8(uint32_t addr, uint32_t data)
  52 {
  53         switch(addr & 0xff) {
  54         case 0x18:
  55                 ptr = (ptr & 0x7f00) | data;
  56                 break;
  57         case 0x19:
  58                 ptr = (ptr & 0x00ff) | ((data & 0x7f) << 8);
  59                 break;
  60         case 0x1a:
  61                 if(ram[ptr & 0x7fff] != data) {
  62                         modified = true;
  63                 }
  64                 ram[ptr & 0x7fff] = data;
  65                 break;
  66         }
  67 }
  68
  69 uint32_t RAMPAC2::read_io8(uint32_t addr)
  70 {
  71         return ram[ptr & 0x7fff];
  72 }
  73
  74 void RAMPAC2::open_file(const _TCHAR* file_path)
  75 {
  76         // save modified data
  77         release();
  78
  79         // load specified file
  80         FILEIO* fio = new FILEIO();
  81         if(fio->Fopen(file_path, FILEIO_READ_BINARY)) {
  82                 fio->Fread(ram, sizeof(ram), 1);
  83                 fio->Fclose();
  84         } else {
  85                 // initialize formatted image
  86                 memset(ram, 0, sizeof(ram));
  87                 memcpy(ram, header, sizeof(header));
  88                 memset(ram + 0x20, 0xff, 0x200);
  89                 memset(ram + 0x300, 0xfe, 0x004);
  90                 memset(ram + 0x304, 0xff, 0x0fc);
  91         }
  92         delete fio;
  93
  94         my_tcscpy_s(path, _MAX_PATH, file_path);
  95         opened = true;
  96         modified = false;
  97 }
  98
  99 #define STATE_VERSION   1
 100
 101 bool RAMPAC2::process_state(FILEIO* state_fio, bool loading)
 102 {
 103         if(!state_fio->StateCheckUint32(STATE_VERSION)) {
 104                 return false;
 105         }
 106         state_fio->StateBuffer(ram, sizeof(ram), 1);
 107         state_fio->StateUint32(ptr);
 108         state_fio->StateBool(opened);
 109         state_fio->StateBool(modified);
 110         return true;
 111 }
 112
 113 }